Les principaux domaines d’activité du Modelisation Group sont :
L’équipe de recherche s’intéresse à modéliser toute la chaîne de l’énergie, de la production à la consommation, en passant par la distribution et la supervision. Comprendre le fonctionnement physique précis des machines de production permet de rationaliser leur utilisation et les utiliser pour réaliser du stockage. Une partie numérique essentielle vient compléter le travail en proposant des modélisations des réseaux de distribution d’énergie et des systèmes de communication nécessaires à l’optimisation de l’ensemble.
S’appuyant sur tous les domaines de l’ingénierie, les matériaux et les structures innovants connaissent une croissance considérable. Cela implique le développement de nouvelles technologies, notamment celles de fabrication additive, et des matériaux intelligents. L’équipe de recherche participe à ce champ de recherche en mettant l’accent sur trois sujets : la modélisation multi-échelle des matériaux ; l’amélioration des procédés de fabrication additive et la caractérisation des performances des nouveaux matériaux.
La modélisation des fluides complexes concerne tous les fluides qui ne peuvent pas être décrits par les équations de Navier-Stokes. La plupart des problèmes étudiés sont en lien avec la dynamique des fluides complexes et des écoulements polyphasiques notamment les interactions fluide-particule. La recherche développée implique une collaboration interdisciplinaire entre plusieurs domaines scientifiques. Nous proposons une analyse mathématique et numérique de ces fluides ayant des applications industrielles.
L’équipe d’enseignants-chercheurs Modelisation Group
L’ensemble des travaux des enseignants-chercheurs Modelisation Group.
Francesco Vannini; Alessandro Biancalani; Alberto Bottino; Thomas Hayward-Schneider; Philipp Lauber; Alexey Mishchenko; Emanuele Poli; B Rettino; Gregorio Vlad; Xin Wang; ASPEX Upgrade Team
Gyrokinetic modelling of the Alfvén mode and EGAM activity in ASDEX Upgrade Article de journal
Dans: Journal of Physics: Conference Series, vol. 2397, p. 012003, 2022.
@article{vannini_2300,
title = {Gyrokinetic modelling of the Alfvén mode and EGAM activity in ASDEX Upgrade},
author = {Francesco Vannini and Alessandro Biancalani and Alberto Bottino and Thomas Hayward-Schneider and Philipp Lauber and Alexey Mishchenko and Emanuele Poli and B Rettino and Gregorio Vlad and Xin Wang and ASPEX Upgrade Team},
url = {https://dx.doi.org/10.1088/1742-6596/2397/1/012003},
year = {2022},
date = {2022-12-01},
journal = {Journal of Physics: Conference Series},
volume = {2397},
pages = {012003},
abstract = {Energetic particles present in tokamak machines can drive through resonant wave-particle interaction different plasma instabilities, e.g Alfvén modes and energetic particle-driven geodesic acoustic modes (EGAMs). While the former are potentially detrimental as they can enhance the energetic particle transport and damage the machine wall, the latter are axisymmetric, possibly benign modes that can act to regulate turbulence. A unique scenario, the so-called NLED-AUG case, has been developed in ASDEX Upgrade by tuning the plasma parameters so that the energetic particle kinetic energy is 100 times higher than that of the background plasma, like in ITER. An intense energetic particle-driven activity is observed, most prominently various Alfvén mode bursts triggering chirping EGAMs. The present work reports studies on the Alfvén mode and EGAM dynamics showing, for the first time, many toroidal mode gyrokinetic simulations with ORB5 where the NLED-AUG case scenario is considered. We study the mode dynamics modelling the energetic particles with different equilibrium distribution functions, such as: isotropic slowing-down, double-bump-on-tail and equivalent Maxwellian. We retain, at the beginning, the nonlinearities only in the energetic particle dynamics. Later, also the background plasma species nonlinearities are taken into account.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Salah-Eddine Ouassil; Anouar El Magri; Hamidreza Vanaei; Sébastien Vaudreuil
Investigating the effect of printing conditions and annealing on the porosity and tensile behavior of 3D-printed polyetherimide material in Z-direction Article de journal
Dans: Journal Of Applied Polymer Science, vol. 140, no. 4, p. e53353, 2022.
@article{ouassil_2046,
title = {Investigating the effect of printing conditions and annealing on the porosity and tensile behavior of 3D-printed polyetherimide material in Z-direction},
author = {Salah-Eddine Ouassil and Anouar El Magri and Hamidreza Vanaei and Sébastien Vaudreuil},
url = {https://doi.org/10.1002/app.53353},
year = {2022},
date = {2022-11-01},
journal = {Journal Of Applied Polymer Science},
volume = {140},
number = {4},
pages = {e53353},
abstract = {Fused filament fabrication process presents drawbacks in mechanical properties observed when printing in the build direction (Z-direction). Such anisotropic properties will affect the part's performances and have to be minimized during fabrication. This study aims to evaluate the effects of nozzle temperature, printing speed and specimen state (annealed or as-printed) on porosity percentage and tensile properties for 3D printed polyetherimide (PEI) (ULTEM 1010) parts in Z-direction. The results demonstrated that print speed is the most influential process parameter that should be adjusted in consideration with the other printing parameters. The specimens' state did not reveal a noticeable influence, as the amorphous nature of PEI is considered less receptive to annealing. The optimization method to achieve the best results yielded values of 360 °C and 30 mm/s as printing conditions, followed by heat treatment. This was confirmed by porosity measurements, tensile testing, and scanning electron microscopy observations. The best performances of PEI material were 3425.5 MPa, 102 MPa, and 4.30% for Young's modulus, tensile strength, and elongation at break, respectively.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Francesco Vannini; Alessandro Biancalani; Alberto Bottino; Thomas Hayward-Schneider; Philipp Lauber; Alexey Mishchenko; Emanuele Poli; B Rettino; Gregorio Vlad; Xin Wang; ASPEX Upgrade Team
Gyrokinetic modelling of the Alfvén mode activity in ASDEX Upgrade with an isotropic slowing-down fast-particle distribution Article de journal
Dans: Nuclear Fusion, vol. 62, no. 12, p. 126042, 2022.
@article{vannini_2299,
title = {Gyrokinetic modelling of the Alfvén mode activity in ASDEX Upgrade with an isotropic slowing-down fast-particle distribution},
author = {Francesco Vannini and Alessandro Biancalani and Alberto Bottino and Thomas Hayward-Schneider and Philipp Lauber and Alexey Mishchenko and Emanuele Poli and B Rettino and Gregorio Vlad and Xin Wang and ASPEX Upgrade Team},
url = {https://dx.doi.org/10.1088/1741-4326/ac8b1e},
year = {2022},
date = {2022-11-01},
journal = {Nuclear Fusion},
volume = {62},
number = {12},
pages = {126042},
abstract = {In the present paper, the evolution of the Alfvén modes (AMs) is studied in a realistic ASDEX Upgrade equilibrium by analyzing the results of simulations with the global, electromagnetic, gyrokinetic particle-in-cell code ORB5. The energetic particles (EPs) are modelled both via the newly implemented isotropic slowing-down and with Maxwellian distribution functions. The comparison of the numerical results shows that modelling the EPs with the equivalent Maxwellian rather than with the slowing-down, does not significantly affect the frequency of the driven AM, while its growth rate appears to be underestimated with a quantitative difference as large as almost 30%. Additionally the choice of the isotropic slowing-down allows a better description of the nonlinear modification of the dominant AM frequency, while an equivalent Maxwellian underestimates it. A good comparison with the experimental spectrogram is found.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Fatima Benmesbah; Pascal Clain; Olivia Fandino; Véronique Osswald; Laurence Fournaison; Christophe Dicharry; Anthony Delahaye
Calorimetric study of carbon dioxide (CO2) hydrate formation and dissociation processes in porous media Article de journal
Dans: Chemical Engineering Science, vol. 264, p. 118108, 2022.
@article{benmesbah_1960,
title = {Calorimetric study of carbon dioxide (CO2) hydrate formation and dissociation processes in porous media},
author = {Fatima Benmesbah and Pascal Clain and Olivia Fandino and Véronique Osswald and Laurence Fournaison and Christophe Dicharry and Anthony Delahaye},
url = {https://www.sciencedirect.com/science/article/pii/S0009250922006923},
year = {2022},
date = {2022-10-01},
journal = {Chemical Engineering Science},
volume = {264},
pages = {118108},
abstract = {Understanding the formation and dissociation mechanisms of gas hydrate in porous media is important for the development of new energy-efficient and environmentally friendly technologies related to cold storage as they provide significant latent heat and energy density at suitable phase change temperature. The challenge is to understand the interactions between gas hydrates and the chosen storage media in order to assess the operating conditions likely to optimize time and energy consumption in cold production and storage systems. In this work, CO2 hydrates formation and dissociation are investigated in two morphologically different porous materials: sand and silica gels. A calorimetric approach is applied to study both the CO2 hydrate formation kinetics, particularly the induction time, and the amount of hydrate formed for each of the two porous materials. The experiments are performed using a differential thermal analysis device with two identical measuring cells. The present work is focused on assessing the effect of key factors like water saturation, particle size and the morphology of porous media on CO2 hydrate formation and dissociation processes. Overall, the results do not show a statistically significant correlation between these factors and the induction time. Interestingly, the results obtained with dual porous silica gel showed a higher amount of hydrate formed compared to those with sand for similar initial pressure, temperature and water content conditions. This result may be due to the fact that silica gels provide higher surface area due to their smaller particle size (20-45 µm vs 80-450 µm for sand), and the presence of internal pore volume in silica gel particles.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Hamidreza Vanaei; Sofiane Khelladi; Abbas Tcharkhtchi
Roadmap: Numerical-Experimental Investigation and Optimization of 3D-Printed Parts Using Response Surface Methodology Article de journal
Dans: Materials, vol. 15, no. 20, p. 7193, 2022.
@article{vanaei_1962,
title = {Roadmap: Numerical-Experimental Investigation and Optimization of 3D-Printed Parts Using Response Surface Methodology},
author = {Hamidreza Vanaei and Sofiane Khelladi and Abbas Tcharkhtchi},
url = {https://www.mdpi.com/1996-1944/15/20/7193},
year = {2022},
date = {2022-10-01},
journal = {Materials},
volume = {15},
number = {20},
pages = {7193},
abstract = {Several process variables can be taken into account to optimize the fused filament fabrication (FFF) process, a promising additive manufacturing technique. To take into account the most important variables, a numerical-experimental roadmap toward the optimization of the FFF process, by taking into account some physico-chemical and mechanical characteristics, has been proposed to implement the findings through the thermal behavior of materials. A response surface methodology (RSM) was used to consider the effect of liquefier temperature, platform temperature, and print speed. RSM gave a confidence domain with a high degree of crystallinity, Young's modulus, maximum tensile stress, and elongation at break. Applying the corresponding data from the extracted zone of optimization to the previously developed code showed that the interaction of parameters plays a vital role in the rheological characteristics, such as temperature profile of filaments during deposition. Favorable adhesion could be achieved through the deposited layers in the FFF process. The obtained findings nurture motivations for working on the challenges and bring us one step closer to the optimization objectives in the FFF process to solve the industrial challenges.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Swaminath Venkateswaran; Damien Charles Chablat
Stability analysis of tensegrity mechanism coupled with a bio-inspired piping inspection robot Article de journal
Dans: Computer Methods In Biomechanics And Biomedical Engineering, vol. 25, no. 1, p. 300-302, 2022.
@article{venkateswaran_2384,
title = {Stability analysis of tensegrity mechanism coupled with a bio-inspired piping inspection robot},
author = {Swaminath Venkateswaran and Damien Charles Chablat},
url = {https://www.tandfonline.com/doi/abs/10.1080/10255842.2022.2116885},
year = {2022},
date = {2022-10-01},
journal = {Computer Methods In Biomechanics And Biomedical Engineering},
volume = {25},
number = {1},
pages = {300-302},
abstract = {Piping inspection robots play an essential role for industries as they can reduce the human effort and pose lesser risker to their lives. Generally, the locomotion techniques of these robots can be classified into mechanical and bioinspired. By using slot-follower leg mechanisms, DC-motors and control units, a rigid caterpillar type inspection robot was designed and developed at LS2N, France. This rigid prototype helped in identifying the static forces required to accomplish good contact forces with the pipeline walls. In order to work inside curvatures, a tensegrity mechanism that uses three tension springs and a passive universal joint was introduced between each module of this robot. The optimal parameters of the robot assembly were identified by considering a preloading along the cables, which ensured the stability of the entire robot. However, under static conditions, there exists some forces on the robot,especially on the tensegrity mechanism when one end of the leg mechanisms is clamped with the pipeline walls. These forces are dominant when the orientation of the pipeline is horizontal. The objective of this article is to understand the effect of stiffness of thespring on the static stability of the tensegrity mechanism under the self-weight of the robot assembly.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Anouar El Magri; Hamidreza Vanaei; Salah Eddine Bencaid; Sébastien Vaudreuil
Effects of Laser Power and Hatch Orientation on Final Properties of PA12 Parts Produced by Selective Laser Sintering Article de journal
Dans: Polymers, vol. 14, no. 17, p. 3674, 2022.
@article{el_magri_1958,
title = {Effects of Laser Power and Hatch Orientation on Final Properties of PA12 Parts Produced by Selective Laser Sintering},
author = {Anouar El Magri and Hamidreza Vanaei and Salah Eddine Bencaid and Sébastien Vaudreuil},
url = {https://doi.org/10.3390/polym14173674},
year = {2022},
date = {2022-09-01},
journal = {Polymers},
volume = {14},
number = {17},
pages = {3674},
abstract = {Poly(dodecano-12-lactam) (commercially known as polyamide ?PA12?) is one of the most resourceful materials used in the selective laser sintering (SLS) process due to its chemical and physical properties. The present work examined the influence of two SLS parameters, namely, laser power and hatch orientation, on the tensile, structural, thermal, and morphological properties of the fabricated PA12 parts. The main objective was to evaluate the suitable laser power and hatching orientation with respect to obtaining better final properties. PA12 powders and SLS-printed parts were assessed through their particle size distributions, X-ray diffraction (XRD), Fourier Transform Infrared spectroscopy (FTIR), differential scanning calorimetry (DSC), a scanning electron microscope (SEM), and their tensile properties. The results showed that the significant impact of the laser power while hatching is almost unnoticeable when using a high laser power. A more significant condition of the mechanical properties is the uniformity of the powder bed temperature. Optimum factor levels were achieved at 95% laser power and parallel/perpendicular hatching. Parts produced with the optimized SLS parameters were then subjected to an annealing treatment to induce a relaxation of the residual stress and to enhance the crystallinity. The results showed that annealing the SLS parts at 170 °C for 6 h significantly improved the thermal, structural, and tensile properties of 3D-printed PA12 parts.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Anouar El Magri; Salah Eddine Bencaid; Hamidreza Vanaei; Sébastien Vaudreuil
Effects of Laser Power and Hatch Orientation on Final Properties of PA12 Parts Produced by Selective Laser Sintering Article de journal
Dans: Polymers, vol. 14, no. 17, p. 3674, 2022.
@article{el_magri_1892,
title = {Effects of Laser Power and Hatch Orientation on Final Properties of PA12 Parts Produced by Selective Laser Sintering},
author = {Anouar El Magri and Salah Eddine Bencaid and Hamidreza Vanaei and Sébastien Vaudreuil},
url = {https://www.mdpi.com/2073-4360/14/17/3674},
year = {2022},
date = {2022-09-01},
journal = {Polymers},
volume = {14},
number = {17},
pages = {3674},
abstract = {Poly(dodecano-12-lactam) (commercially known as polyamide ?PA12?) is one of the most resourceful materials used in the selective laser sintering (SLS) process due to its chemical and physical properties. The present work examined the influence of two SLS parameters, namely, laser power and hatch orientation, on the tensile, structural, thermal, and morphological properties of the fabricated PA12 parts. The main objective was to evaluate the suitable laser power and hatching orientation with respect to obtaining better final properties. PA12 powders and SLS-printed parts were assessed through their particle size distributions, X-ray diffraction (XRD), Fourier Transform Infrared spectroscopy (FTIR), differential scanning calorimetry (DSC), a scanning electron microscope (SEM), and their tensile properties. The results showed that the significant impact of the laser power while hatching is almost unnoticeable when using a high laser power. A more significant condition of the mechanical properties is the uniformity of the powder bed temperature. Optimum factor levels were achieved at 95% laser power and parallel/perpendicular hatching. Parts produced with the optimized SLS parameters were then subjected to an annealing treatment to induce a relaxation of the residual stress and to enhance the crystallinity. The results showed that annealing the SLS parts at 170 °C for 6 h significantly improved the thermal, structural, and tensile properties of 3D-printed PA12 parts},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Laurent Boudin; Alex Rossi; Francesco Salvarani
A kinetic model of polyatomic gas with resonant collisions Article de journal
Dans: Ricerche Di Matematica, 2022.
@article{boudin_1894,
title = {A kinetic model of polyatomic gas with resonant collisions},
author = {Laurent Boudin and Alex Rossi and Francesco Salvarani},
url = {https://doi.org/10.1007/s11587-022-00733-1},
year = {2022},
date = {2022-09-01},
journal = {Ricerche Di Matematica},
keywords = {},
pubstate = {online},
tppubtype = {article}
}
Alexey Mishchenko; Alberto Bottino; Thomas Hayward-Schneider; Emanuele Poli; Xin Wang; C Nührenberg; Alessandro Biancalani; E Lanti; Philipp Lauber; R Hatzky; Francesco Vannini; Laurent Villard; F Widmer; R Keiber
Gyrokinetic particle-in-cell simulations of electromagnetic turbulence in the presence of fast particles and global modes Article de journal
Dans: Plasma Physics And Controlled Fusion, vol. 64, no. 10, p. 104009, 2022.
@article{mishchenko_2296,
title = {Gyrokinetic particle-in-cell simulations of electromagnetic turbulence in the presence of fast particles and global modes},
author = {Alexey Mishchenko and Alberto Bottino and Thomas Hayward-Schneider and Emanuele Poli and Xin Wang and C Nührenberg and Alessandro Biancalani and E Lanti and Philipp Lauber and R Hatzky and Francesco Vannini and Laurent Villard and F Widmer and R Keiber},
url = {https://dx.doi.org/10.1088/1361-6587/ac8dbc},
year = {2022},
date = {2022-09-01},
journal = {Plasma Physics And Controlled Fusion},
volume = {64},
number = {10},
pages = {104009},
abstract = {Global simulations of electromagnetic turbulence in circular-flux-surface tokamak and ASDEX-Upgrade geometry, tearing instabilities and their combination with the electromagnetic turbulence, nonlinear Alfvénic modes in the presence of fast particles and their combination with the electromagnetic turbulence and global electromagnetic turbulence in Wendelstein 7-X stellarator geometry are carried out using the gyrokinetic particle-in-cell code ORB5 (Lanti et al 2020 Comp. Phys. Comm. 251 107072) and EUTERPE (Kornilov et al 2004 Phys. Plasmas 11 3196). Computational feasibility of simulating such complex coupled systems is demonstrated. For simplicity, the reduced mass ratio is used throughout the paper.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Loubna Salhi; Mohammed Seaid; Driss Yakoubi
Well-posedness and numerical approximation of steady convection-diffusion-reaction problems in porous media Article de journal
Dans: Computers & Mathematics With Applications, vol. 124, p. 129-148, 2022.
@article{salhi_1885,
title = {Well-posedness and numerical approximation of steady convection-diffusion-reaction problems in porous media},
author = {Loubna Salhi and Mohammed Seaid and Driss Yakoubi},
url = {https://www.sciencedirect.com/science/article/abs/pii/S0898122122003443},
year = {2022},
date = {2022-08-01},
journal = {Computers & Mathematics With Applications},
volume = {124},
pages = {129-148},
abstract = {We study a class of steady nonlinear convection-diffusion-reaction problems in porous media. The governing equations consist of coupling the Darcy equations for the pressure and velocity fields to two equations for the heat and mass transfer. The viscosity and diffusion coefficients are assumed to be nonlinear depending on the temperature and concentration of the medium. Well-posedness of the coupled problem is analyzed and existence along with uniqueness of the weak solution is investigatedbased on a fixed-point method. An iterative scheme for solving the associated fixed-point problem is proposed and its convergence is studied. Numerical experiments are presented for two examples of coupled convection-diffusion-reaction problems. Applications to radiative heat transfer and propagation of thermal fronts in porous media are also included in this study. The obtained results show good numerical convergence and validate the established theoretical estimates.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Mofdi El-Amrani; Loubna Salhi; Mohammed Seaid; Driss Yakoubi
An iterative scheme for solving acoupled Darcy-convection-diffusion model Article de journal
Dans: Journal Of Mathematical Analysis And Applications, vol. 517, no. 2, p. 126603, 2022.
@article{el-amrani_1887,
title = {An iterative scheme for solving acoupled Darcy-convection-diffusion model},
author = {Mofdi El-Amrani and Loubna Salhi and Mohammed Seaid and Driss Yakoubi},
url = {https://www.sciencedirect.com/science/article/pii/S0022247X22006175},
year = {2022},
date = {2022-08-01},
journal = {Journal Of Mathematical Analysis And Applications},
volume = {517},
number = {2},
pages = {126603},
abstract = {We present an iterative scheme for the numerical analysis of a class of coupled Darcy-convection-diffusion problems modelling flow and heat transfer in porous media. The governing equations consist of the Darcy equations for the flow coupled to a convection-diffusion equation for heat transfer with nonlinear viscosity and diffusion coefficient depending on the temperature. Existence and uniqueness of the weak solution for the considered problem are first analyzed using a fixed-point method and then convergence study of two iterative schemes for the fixed-point algorithm is presented. Two numerical examples are selected to validate the theoretical estimates and to demonstrate the performance of the proposed algorithm. The obtained results support our theoretical expectations for a good numerical convergence with the developed estimates.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Youcef Amirat; Kamel Hamdache; Vladimir V. Shelukhin
Homogenization of MHD flows in porous media Article de journal
Dans: Journal Of Differential Equations, vol. 339, no. 339, p. 90-133, 2022.
@article{amirat_1963,
title = {Homogenization of MHD flows in porous media},
author = {Youcef Amirat and Kamel Hamdache and Vladimir V. Shelukhin},
url = {https://doi.org/10.1016/j.jde.2022.08.014},
year = {2022},
date = {2022-08-01},
journal = {Journal Of Differential Equations},
volume = {339},
number = {339},
pages = {90-133},
abstract = {The paper is concerned with the homogenization of a nonlinear differential system describing the flow of an electrically conducting, incompressible and viscous Newtonian fluid through a periodic porous medium, in the presence of a magnetic field. We introduce a variational formulation of the differential system equipped with boundary conditions. We show the existence of a solution of the variational problem, and derive uniform estimates of the solutions depending on the characteristic parameters of the flow. Using the two-scale convergence method, we rigorously derive a two-scale equation for the two-scale current density, and a two-pressure Stokes system. We derive, in the case of constant magnetic permeability, an explicit relation expressing the macroscopic velocity as a function of the macroscopic Lorentz force, the pressure gradient, the external body force, and the macroscopic current density, via two permeability filtration ten- sors. When the magnetic field is absent, this relation reduces to the Darcy law.
© 2022 Elsevier Inc. All rights reserved.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Fitoussi Joseph; Mohammad Hossein Nikooharf; Achraf Kallel; Mohammadali Shirinbayani
Dans: Applied Composite Materials, vol. 29, no. 3, p. 1-21, 2022.
@article{joseph_1864,
title = {Mechanical Properties and Damage Behavior of Polypropylene Composite (GF50-PP) Plate Fabricated by Thermocompression Process Under High Strain Rate Loading at Room and Cryogenic Temperatures},
author = {Fitoussi Joseph and Mohammad Hossein Nikooharf and Achraf Kallel and Mohammadali Shirinbayani},
url = {https://link.springer.com/article/10.1007/s10443-022-10047-y},
year = {2022},
date = {2022-07-01},
journal = {Applied Composite Materials},
volume = {29},
number = {3},
pages = {1-21},
abstract = {This paper concerns the coupling effect of strain rate and temperature on the damage mechanical properties of the long-glass-fiber-reinforced polypropylene (GF50-PP) composite produced by the thermocompression process. Composite plates of GF50-PP have been employed to study the effect of glass fiber distribution on the mechanical properties of the composites. To achieve this objective the tensile tests have been performed at strain rate range from quasi-static to 100 s?1 at two loading temperatures of 20 °C and -70 °C, while measuring the local deformation through a contactless technique using a high-speed camera. High strain rate tensile tests findings showed that GF50-PP behavior is strongly strain-rate dependent. For instance, the stress damage threshold for three fiber orientations of 0°, 45°, and 90° to the Mold Flow Direction (MFD) was increased, when the strain rate varies from quasi-static (0.001 s?1) to 100 s?1 at two loading temperatures of 20 °C and -70 °C. The experimental methodology was coupled to microscopic observations using SEM to study the damage mechanisms of GF50-PP. The analysis confirms that there are three damage mechanisms: fiber-matrix interface debonding, matrix breakage, and pseudo-delamination between neighboring bundles of fibers.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Joseph Fitoussi; Mohammad Hossein Nikooharf; Achraf Kallel; Mohammadali Shirinbayani
Dans: Applied Composite Materials, vol. 29, no. 3, p. 1-21, 2022.
@article{fitoussi_1864,
title = {Mechanical Properties and Damage Behavior of Polypropylene Composite (GF50-PP) Plate Fabricated by Thermocompression Process Under High Strain Rate Loading at Room and Cryogenic Temperatures},
author = {Joseph Fitoussi and Mohammad Hossein Nikooharf and Achraf Kallel and Mohammadali Shirinbayani},
url = {https://link.springer.com/article/10.1007/s10443-022-10047-y},
year = {2022},
date = {2022-07-01},
journal = {Applied Composite Materials},
volume = {29},
number = {3},
pages = {1-21},
abstract = {This paper concerns the coupling effect of strain rate and temperature on the damage mechanical properties of the long-glass-fiber-reinforced polypropylene (GF50-PP) composite produced by the thermocompression process. Composite plates of GF50-PP have been employed to study the effect of glass fiber distribution on the mechanical properties of the composites. To achieve this objective the tensile tests have been performed at strain rate range from quasi-static to 100 s?1 at two loading temperatures of 20 °C and -70 °C, while measuring the local deformation through a contactless technique using a high-speed camera. High strain rate tensile tests findings showed that GF50-PP behavior is strongly strain-rate dependent. For instance, the stress damage threshold for three fiber orientations of 0°, 45°, and 90° to the Mold Flow Direction (MFD) was increased, when the strain rate varies from quasi-static (0.001 s?1) to 100 s?1 at two loading temperatures of 20 °C and -70 °C. The experimental methodology was coupled to microscopic observations using SEM to study the damage mechanisms of GF50-PP. The analysis confirms that there are three damage mechanisms: fiber-matrix interface debonding, matrix breakage, and pseudo-delamination between neighboring bundles of fibers.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Antoine Montiel; Thuy Nguyen; Cindy Rountree; Valérie Geertsen; Patrick Guenoun; Daniel Bonamy
Effect of architecture disorder on the elastic response of two-dimensional lattice materials Article de journal
Dans: Physical Review E, vol. 106, no. 1, p. 015004, 2022.
@article{montiel_1922,
title = {Effect of architecture disorder on the elastic response of two-dimensional lattice materials},
author = {Antoine Montiel and Thuy Nguyen and Cindy Rountree and Valérie Geertsen and Patrick Guenoun and Daniel Bonamy},
url = {https://journals.aps.org/pre/abstract/10.1103/PhysRevE.106.015004?ft=1},
year = {2022},
date = {2022-07-01},
journal = {Physical Review E},
volume = {106},
number = {1},
pages = {015004},
abstract = {We examine how disordering joint position influences the linear elastic behavior of lattice materials via numerical simulations in two-dimensional beam networks. Three distinct initial crystalline geometries are selected as representative of mechanically isotropic materials with low connectivity, mechanically isotropic materials with high connectivity, and mechanically anisotropic materials with intermediate connectivity. Introducing disorder generates spatial fluctuations in the elasticity tensor at the local (joint) scale. Proper coarse-graining reveals a well-defined continuum-level scale elasticity tensor. Increasing disorder aids in making initially anisotropic materials more isotropic. The disorder impact on the material stiffness depends on the lattice connectivity: Increasing the disorder softens lattices with high connectivity and stiffens those with low connectivity, without modifying the scaling between elastic modulus and density (linear scaling for high connectivity and cubic scaling for low connectivity). Introducing disorder in lattices with intermediate fixed connectivity reveals both scaling: the linear scaling occurs for low density, the cubic one at high density, and the crossover density increases with disorder. Contrary to classical formulations, this work demonstrates that connectivity is not the sole parameter governing elastic modulus scaling. It offers a promising route to access novel mechanical properties in lattice materials via disordering the architectures.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Loup-Noé Levy; Jérémie Bosom; Guillaume Guérard; Sofiane Ben Amor; Marc Bui; Hai Tran
DevOps Model Appproach for Monitoring Smart Energy Systems Article de journal
Dans: Energies, vol. 15, no. 15, p. 5516, 2022.
@article{levy_1924,
title = {DevOps Model Appproach for Monitoring Smart Energy Systems},
author = {Loup-Noé Levy and Jérémie Bosom and Guillaume Guérard and Sofiane Ben Amor and Marc Bui and Hai Tran},
url = {https://www.mdpi.com/1996-1073/15/15/5516},
year = {2022},
date = {2022-07-01},
journal = {Energies},
volume = {15},
number = {15},
pages = {5516},
abstract = {Energy systems are often socio-technical complex systems that are facing new challenges regarding technological and environmental changes. Because of their complex nature, they cannot be approached solely through analytical modeling, hence the inefficiency of most classical modeling approaches. In this article, a Hybrid Approach based on both systemic and analytical modeling is presented and applied to a case study. From this novel approach, a model?the Multi-Institution Building Energy System?is presented. It allowed us to highlight and detail the need for greater governance of energy systems. The socio-technical solutions identified to answer the issues of governance (Accuracy, Reliability and Fairness) were DevOps methodology and the use of Distributed Microservices Architecture. Based on this framework, the design of a Decision Support System assuring and exploiting state-of-the-art scalable tools for data management and machine learning factories is described in this article. Moreover, we wish to set up the conceptual basis necessary for the design of a generic theoretical framework of optimization applicable to complex socio-technical systems in the context of the management of a shared resource.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Rania M. Himeur; Sofiane Khelladi; Mohamed Abdessamed Ait Chikh; Hamidreza Vanaei; Idir Belaidi; Farid Bakir
Towards an Accurate Aerodynamic Performance Analysis Methodology of Cross-Flow Fans Article de journal
Dans: Energies, vol. 15, no. 14, p. 5134, 2022.
@article{m._himeur_2099,
title = {Towards an Accurate Aerodynamic Performance Analysis Methodology of Cross-Flow Fans},
author = {Rania M. Himeur and Sofiane Khelladi and Mohamed Abdessamed Ait Chikh and Hamidreza Vanaei and Idir Belaidi and Farid Bakir},
url = {https://doi.org/10.3390/en15145134},
year = {2022},
date = {2022-07-01},
journal = {Energies},
volume = {15},
number = {14},
pages = {5134},
abstract = {Cross-flow fans (CFFs) have become increasingly popular in recent years. This is due to their use in several domains such as air conditioning and aircraft propulsion. They also show their utility in the ventilation system of hybrid electric cars. Their high efficiency and performance significantly rely on the design parameters. Up to now, there is no general approach that predicts the CFFs' performance. This work describes a new methodology that helps deduce the performance of CFFs in turbomachinery, using both analytical modeling and experimental data. Two different loss models are detailed and compared to determine the performance-pressure curves of this type of fan. The efficiency evaluation is achieved by realizing a multidisciplinary study, computational fluid dynamics (CFD) simulations, and an optimization algorithm combined to explore the internal flow field and obtain additional information about the eccentric vortex, to finally obtain the ultimate formulation of the Eck/Laing CFF efficiency, which is validated by the experimental results with good agreement. This approach can be an efficient tool to speed up the cross-flow fans' design cycle and to predict their global performance.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Abir Ben Abdallah; Achraf Kallel; Abbas Tcharkhtchi; Tarek Hassine; Fehmi Gamaoun
Modeling of viscoelastic behavior of a shape memory polymer blend Article de journal
Dans: Journal Of Applied Polymer Science, vol. 139, no. 13, p. 51859, 2022.
@article{ben_abdallah_1721,
title = {Modeling of viscoelastic behavior of a shape memory polymer blend},
author = {Abir Ben Abdallah and Achraf Kallel and Abbas Tcharkhtchi and Tarek Hassine and Fehmi Gamaoun},
url = {https://onlinelibrary.wiley.com/doi/10.1002/app.51859},
year = {2022},
date = {2022-05-01},
journal = {Journal Of Applied Polymer Science},
volume = {139},
number = {13},
pages = {51859},
abstract = {Shape memory effect (SME) of polymers is a property that concerns both,
macroscopic and microscopic changes. The variation of internal polymer
properties such, as molecular weight (Mw), rigidity, and viscoelasticity could
alter its SME. In this study, a bi-parabolic model with six parameters is used to
describe the viscoelastic behavior of a shape memory polymer (SMP) blend
(40% poly(caprolactone), PCL/60% Styrene-Butadiene-Styrene) with different
PCL Mw. These parameters are determined using the Cole-Cole method.
Modeling curves (E00 = f (E0)) will be then compared to experimental data from
dynamical mechanical analysis (DMA) tests. It is shown that the bi-parabolic
model predicts well the behavior of the SMP mixture for different Mw of PCL.
Afterwards, the evolution of the model parameters with the Mw of PCL is
investigated. It is revealed that, when Mw of PCL drops, the relaxation modulus
E0 increases. This result proves that the rigidity of the SMP blend rises with
Mw declines.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Laurent Boudin; Francesco Salvarani; Emmanuel Trélat
Exponential Convergence Towards Consensus for Non-Symmetric Linear First-Order Systems in Finite and Infinite Dimensions Article de journal
Dans: Siam Journal On Mathematical Analysis, vol. 54, no. 3, p. 2727-2752, 2022.
@article{boudin_1819,
title = {Exponential Convergence Towards Consensus for Non-Symmetric Linear First-Order Systems in Finite and Infinite Dimensions},
author = {Laurent Boudin and Francesco Salvarani and Emmanuel Trélat},
url = {https://epubs.siam.org/doi/abs/10.1137/21M1416102},
year = {2022},
date = {2022-05-01},
journal = {Siam Journal On Mathematical Analysis},
volume = {54},
number = {3},
pages = {2727-2752},
abstract = {We consider finite and infinite-dimensional first-order consensus systems with time- constant interaction coefficients. For symmetric coefficients, convergence to consensus is classically established by proving, for instance, that the usual variance is an exponentially decreasing Lyapunov function. We investigate here the convergence to consensus in the non-symmetric case: we identify a positive weight which allows us to define a weighted mean corresponding to the consensus and obtain exponential convergence towards consensus. Moreover, we compute the sharp exponential decay rate.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Ihab Taleb; Guillaume Guérard; Nga Nguyen; Frédéric Fauberteau
A Flexible Deep Learning Method for Energy Forecasting Article de journal
Dans: Energies, vol. 15, no. 11, p. 3926, 2022.
@article{taleb_1836,
title = {A Flexible Deep Learning Method for Energy Forecasting},
author = {Ihab Taleb and Guillaume Guérard and Nga Nguyen and Frédéric Fauberteau},
url = {https://www.mdpi.com/1996-1073/15/11/3926},
year = {2022},
date = {2022-05-01},
journal = {Energies},
volume = {15},
number = {11},
pages = {3926},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
B Rettino; Thomas Hayward-Schneider; Alessandro Biancalani; Alberto Bottino; I Chavdarovski; M Weiland; Francesco Vannini; F Jenko; Philipp Lauber
Gyrokinetic modeling of anisotropic energetic particle driven instabilities in tokamak plasmas Article de journal
Dans: Nuclear Fusion, vol. 62, no. 7, p. 076027, 2022.
@article{rettino_2297,
title = {Gyrokinetic modeling of anisotropic energetic particle driven instabilities in tokamak plasmas},
author = {B Rettino and Thomas Hayward-Schneider and Alessandro Biancalani and Alberto Bottino and I Chavdarovski and M Weiland and Francesco Vannini and F Jenko and Philipp Lauber},
url = {https://dx.doi.org/10.1088/1741-4326/ac6680},
year = {2022},
date = {2022-05-01},
journal = {Nuclear Fusion},
volume = {62},
number = {7},
pages = {076027},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Sarra Maarouf; Christine Bernardi; Driss Yakoubi
Characteristics/finite element analysis for two incompressible fluid flows with surface tension using level set method Article de journal
Dans: Computer Methods In Applied Mechanics And Engineering, vol. 394, p. 114843, 2022.
@article{maarouf_1803,
title = {Characteristics/finite element analysis for two incompressible fluid flows with surface tension using level set method},
author = {Sarra Maarouf and Christine Bernardi and Driss Yakoubi},
url = {https://www.sciencedirect.com/science/article/pii/S0045782522001530},
year = {2022},
date = {2022-03-01},
journal = {Computer Methods In Applied Mechanics And Engineering},
volume = {394},
pages = {114843},
abstract = {In this paper, we present and analyze a finite element level set method based on the method of characteristics for two phase
flow. Surface tension effects are taken into account by the CSF approach. We first write the variational formulation of the problem and investigate its well-posedness. Next, for the discretization, a first order method of characteristics approach for the
evolution of the level set function and for the material derivative of the velocity is used. The velocity and pressure unknowns
are discretized by P2? P1 Taylor-Hood finite elements. Then, in each time step, the interface transport is decoupled from the
Navier-Stokes equations. Well-posedness results for subproblems in this decoupled discrete problem are derived. Furthermore,
under high regularity assumptions, we state error estimates for our scheme. Ultimately, three computational examples illustrate
the performance of the proposed method.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Baye Gueye Thiam; Anouar El Magri; Hamidreza Vanaei; Sébastien Vaudreuil
3D Printed and Conventional Membranes?A Review Article de journal
Dans: Polymers, vol. 14, no. 5, p. 1023, 2022.
@article{gueye_thiam_2098,
title = {3D Printed and Conventional Membranes?A Review},
author = {Baye Gueye Thiam and Anouar El Magri and Hamidreza Vanaei and Sébastien Vaudreuil},
url = {https://doi.org/10.3390/polym14051023},
year = {2022},
date = {2022-03-01},
journal = {Polymers},
volume = {14},
number = {5},
pages = {1023},
abstract = {Polymer membranes are central to the proper operation of several processes used in a wide range of applications. The production of these membranes relies on processes such as phase inversion, stretching, track etching, sintering, or electrospinning. A novel and competitive strategy in membrane production is the use of additive manufacturing that enables the easier manufacture of tailored membranes. To achieve the future development of better membranes, it is necessary to compare this novel production process to that of more conventional techniques, and clarify the advantages and disadvantages. This review article compares a conventional method of manufacturing polymer membranes to additive manufacturing. A review of 3D printed membranes is also done to give researchers a reference guide. Membranes from these two approaches were compared in terms of cost, materials, structures, properties, performance. and environmental impact. Results show that very few membrane materials are used as 3D-printed membranes. Such membranes showed acceptable performance, better structures, and less environmental impact compared with those of conventional membranes.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Jean Deteix; Gerard Lionel Ndetchoua Kouamoa; Driss Yakoubi
A new energy stable fractional time stepping scheme for the Navier-Stokes/Allen-Cahn diffuse interface model Article de journal
Dans: Computer Methods In Applied Mechanics And Engineering, vol. 393, p. 114759, 2022.
@article{deteix_1802,
title = {A new energy stable fractional time stepping scheme for the Navier-Stokes/Allen-Cahn diffuse interface model},
author = {Jean Deteix and Gerard Lionel Ndetchoua Kouamoa and Driss Yakoubi},
url = {https://www.sciencedirect.com/science/article/pii/S0045782522001104},
year = {2022},
date = {2022-02-01},
journal = {Computer Methods In Applied Mechanics And Engineering},
volume = {393},
pages = {114759},
abstract = {In this work, we present an original time-discrete formulation of the coupled equations relating the velocity and pressure
of an unsteady flow of two immiscible fluids and the Allen-Cahn equation describing the interface between both of them. We
first prove this time-discrete formulation (based on the concept of coupled projection scheme (Deteix et al., 2014)) to be well
posed and energy stable. We then propose a new family of iterative schemes for the actual approximation of solutions. We
complete this work with numerical tests illustrating the order of accuracy and applying the new scheme on the well known
rising bubble benchmark.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Hamidreza Vanaei; Sofiane Khelladi; Deligant Michael; Mohammadali Shirinbayani; Abbas Tcharkhtchi
Numerical Prediction for Temperature Profile of Parts Manufactured using Fused Filament Fabrication Article de journal
Dans: Journal Of Manufacturing Processes, vol. 76, p. 548-558, 2022.
@article{vanaei_2095,
title = {Numerical Prediction for Temperature Profile of Parts Manufactured using Fused Filament Fabrication},
author = {Hamidreza Vanaei and Sofiane Khelladi and Deligant Michael and Mohammadali Shirinbayani and Abbas Tcharkhtchi},
url = {https://doi.org/10.1016/j.jmapro.2022.02.042},
year = {2022},
date = {2022-02-01},
journal = {Journal Of Manufacturing Processes},
volume = {76},
pages = {548-558},
abstract = {Bonding of parts produced by fused filament fabrication (FFF) significantly depends on the temperature profile of filaments depositing one top of each other. It is necessary to evaluate the temperature profile during fabrication of structures using both theoretical and experimental approaches. This work describes the overall heat transfer (using finite volume method) that exists in such a process by taking into account the possible phenomena that are developing during the manufacturing sequence: conduction between filaments, conduction between filament and support, and convection with the environment. Although the developed model is general and applicable to both amorphous and semi-crystalline polymers and/or composites, the recordings of temperature variation at the interface of adjacent filaments of a printed vertical wall of PLA illustrated good agreement by implementing very small K-type thermocouples in parallel. It is particularly concerning the occurrence of re-heating peaks during the deposition of new filaments onto previously deposited ones. The sensitivity of the developed code to the operating conditions is shown by variation of several parameters. This makes it easy to apply it for optimization purposes. Theoretical modeling and experimental data presented in this study help better understanding of heat transfer existing in polymer/composite additive manufacturing, and can be valuable to predict more accurately the bond quality and apply the obtained findings for further steps.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Mireille El Haddad; Youssef Belhamadia; Jean Deteix; Driss Yakoubi
A projection scheme for phase change problems with convection Article de journal
Dans: Computers & Mathematics With Applications, vol. 108, no. 1, p. 109-122, 2022.
@article{el_haddad_1795,
title = {A projection scheme for phase change problems with convection},
author = {Mireille El Haddad and Youssef Belhamadia and Jean Deteix and Driss Yakoubi},
url = {https://www-sciencedirect-com.acces.bibl.ulaval.ca/science/article/pii/S0898122122000013?via%3Dihub},
year = {2022},
date = {2022-01-01},
journal = {Computers & Mathematics With Applications},
volume = {108},
number = {1},
pages = {109-122},
abstract = {Numerical modeling of phase change problems with convection is known to be computationally expensive. The main challenge comes from the coupling between Navier-Stokes and heat energy equations. In this paper, we develop a new scheme for phase change problems based on a projection method. The proposed method reduces the size of the system by splitting the temperature, the velocity, and the pressure fields while preserving the accuracy of the simulations. A single-domain approach using a variant of the enthalpy-porosity formulation is employed. Incompressible Navier-Stokes problem with Boussinesq approximation for thermal effects in solid and liquid regions is considered. We regularize the discontinuous variables such as latent heat and material properties by a continuous and differentiable hyperbolic tangent function. The robustness and effectiveness of the proposed scheme are illustrated by comparing the numerical results with numerical and experimental benchmark},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Özgür Gürcan; Johan Anderson; Sara Moradi; Alessandro Biancalani; Pierre Morel
Phase and amplitude evolution in the network of triadic interactions of the Hasegawa-Wakatani system Article de journal
Dans: Physics Of Plasmas, vol. 29, no. 5, p. 052306, 2022.
@article{gurcan_1825,
title = {Phase and amplitude evolution in the network of triadic interactions of the Hasegawa-Wakatani system},
author = {Özgür Gürcan and Johan Anderson and Sara Moradi and Alessandro Biancalani and Pierre Morel},
url = {https://aip.scitation.org/doi/10.1063/5.0089073},
year = {2022},
date = {2022-01-01},
journal = {Physics Of Plasmas},
volume = {29},
number = {5},
pages = {052306},
abstract = {The Hasegawa-Wakatani system, commonly used as a toy model of dissipative drift waves in fusion devices, is revisited with considerations
of phase and amplitude dynamics of its triadic interactions. It is observed that a single resonant triad can saturate via three way phase
locking, where the phase differences between dominant modes converge to constant values as individual phases increase in time. This allows
the system to have approximately constant amplitude solutions. Non-resonant triads show similar behavior only when one of its legs is a
zonal wave number. However, when an additional triad, which is a reflection of the original one with respect to the y axis is included, the
behavior of the resulting triad pair is shown to be more complex. In particular, it is found that triads involving small radial wave numbers
(large scale zonal flows) end up transferring their energy to the subdominant mode which keeps growing exponentially, while those involving
larger radial wave numbers (small scale zonal flows) tend to find steady chaotic or limit cycle states (or decay to zero). In order to study the
dynamics in a connected network of triads, a network formulation is considered, including a pump mode, and a number of zonal and non-
zonal subdominant modes as a dynamical system. It was observed that the zonal modes become clearly dominant only when a large number
of triads are connected. When the zonal flow becomes dominant as a ?collective mean field,? individual interactions between modes become
less important, which is consistent with the inhomogeneous wave-kinetic picture. Finally, the results of direct numerical simulation are dis-
cussed for the same parameters, and various forms of the order parameter are computed. It is observed that nonlinear phase dynamics results
in a flattening of the large scale phase velocity as a function of scale in direct numerical simulations.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Nada Chami; Yasmine Salehy; Pascal Clain; Didier Dalmazzone; Anthony Delahaye; Laurence Fournaison
Thermal and energy evaluation of mixed CP+CO2 hydrate slurries Conférence
5ème Journées annuelles Hydrates, IFPEN, Rueil-Malmaison, France, 2022.
@conference{chami_1910,
title = {Thermal and energy evaluation of mixed CP+CO2 hydrate slurries},
author = {Nada Chami and Yasmine Salehy and Pascal Clain and Didier Dalmazzone and Anthony Delahaye and Laurence Fournaison},
url = {https://hydrates.cnrs.fr/les-actions/journees-du-gdr-2022/},
year = {2022},
date = {2022-12-01},
booktitle = {5ème Journées annuelles Hydrates},
address = {IFPEN, Rueil-Malmaison, France},
abstract = {A thermal and energy study of mixed CP + CO2 hydrate slurries is presented to determine the hydrate fraction formed in the loop and to quantify the energy restituted by the mixed hydrate.
The work performed on mixed CP + CO2 hydrate slurries required the establishment of an experimental continuous circulation loop. A heat exchanger is connected to the loop to ensure the hydrates dissociation in order to determine the heat amount involved during the phase change. Thermal studies were also performed to determine the heat exchange coefficients.},
keywords = {},
pubstate = {published},
tppubtype = {conference}
}
Véronique Osswald; Pascal Clain; Didier Dalmazzone; Nada Chami; Yasmine Salehy; Anthony Delahaye; Laurence Fournaison
Kinetic study of CO2 hydrates crystallization in stirred tank reactor based on heat balance Conférence
5ème Journées annuelles Hydrates, IFPEN, Rueil-Malmaison, France, 2022.
@conference{osswald_1911,
title = {Kinetic study of CO2 hydrates crystallization in stirred tank reactor based on heat balance},
author = {Véronique Osswald and Pascal Clain and Didier Dalmazzone and Nada Chami and Yasmine Salehy and Anthony Delahaye and Laurence Fournaison},
url = {https://hydrates.cnrs.fr/les-actions/journees-du-gdr-2022/},
year = {2022},
date = {2022-12-01},
booktitle = {5ème Journées annuelles Hydrates},
address = {IFPEN, Rueil-Malmaison, France},
abstract = {CO2 hydrate crystallization kinetics monitoring performs traditionally by a reactor mass balance. However, this method requires assumptions on CO2 liquid phase concentration and the number of hydration. This work presents the development of a specific method and device to determine the kinetics through direct measurement of the heat flow through the reactor shell and its evaluation compared with the mass balance method. The kinetic effect of two parameters (stirring speed, stirrer type) is outlined.},
keywords = {},
pubstate = {published},
tppubtype = {conference}
}
Yasmine Salehy; Pascal Clain; Nada Chami; Véronique Osswald; Anthony Delahaye; Laurence Fournaison
Rheological analysis of CO2 hydrate slurries in the presence of different additives Conférence
5ème Journées annuelles Hydrates, IFPEN, Rueil-Malmaison, France, 2022.
@conference{salehy_1912,
title = {Rheological analysis of CO2 hydrate slurries in the presence of different additives},
author = {Yasmine Salehy and Pascal Clain and Nada Chami and Véronique Osswald and Anthony Delahaye and Laurence Fournaison},
url = {https://hydrates.cnrs.fr/les-actions/journees-du-gdr-2022/},
year = {2022},
date = {2022-12-01},
booktitle = {5ème Journées annuelles Hydrates},
address = {IFPEN, Rueil-Malmaison, France},
abstract = {The rheological properties of OC2 hydrate slurries in the presence of additives are analyzed. The investigations are based on the capillary viscometer method and the experimental studies are conducted in a controled dynamic flow loop allowing to measure the pressure drop and flow rate. Then, the Hershel-Buckley model is used to determine the behavioral properties of the slurries. Finally, a discussion on the assumptions and limitations of this approach is proposed.},
keywords = {},
pubstate = {published},
tppubtype = {conference}
}
Swaminath Venkateswaran
Un robot bio-inspiré pour l'inspection des canalisations Conférence
Biomim'expo 2022, Paris, France, 2022.
@conference{venkateswaran_2279,
title = {Un robot bio-inspiré pour l'inspection des canalisations},
author = {Swaminath Venkateswaran},
url = {https://www.youtube.com/watch?v=vRXUEnpLvsk&t=776s},
year = {2022},
date = {2022-11-01},
booktitle = {Biomim'expo 2022},
address = {Paris, France},
abstract = {Les robots d'inspection de canalisations jouent un rôle important dans des industries telles que le nucléaire, la chimie et les eaux usées. Ils peuvent opérer avec précision dans un environnement irradié ou pollué, réduisant ainsi les risques pour les humains. Ce travail commence par l'étude du cas d'un robot d'inspection bio-inspiré rigide qui a été développé au LS2N, France pour AREVA. Des modèles statiques et dynamiques sont développés pour comprendre les forces de serrage et les couples des actionneurs du robot. Des validations expérimentales sont également effectuées sur le prototype pour interpréter les forces d'actionnement en temps réel. Pour améliorer sa mobilité, l'architecture du robot est rendue flexible par l'ajout d'un mécanisme de tenségrité. Deux types de mécanismes de tenségrité sont proposés et analysés avec des méthodes algébriques pour comprendre leurs limites d'inclinaison et pour connaître l'influence des paramètres de conception. Des expériences sont réalisées sur l'un des prototypes des mécanismes de tenségrité développés au LS2N avec deux types de trajectoire en positions horizontale et verticale. Ensuite, une optimisation est réalisée pour identifier les moteurs qui peuvent permettre du robot d'inspection de canalisation flexible de passer les coudes et les jonctions pour une plage donnée de diamètres de tuyaux. Une maquette numérique du robot flexible est réalisée dans un logiciel de CAO.},
keywords = {},
pubstate = {online},
tppubtype = {conference}
}
Francesco Salvarani
Exponential convergence to consensus in finite and infinite dimensions Conférence
Japan-France Joint Workshop ?Interacting Particle Systems and Fluid Mechanics : Theory and Applications?, Institut Français du Japon-Kansai, Kyoto, Japan, 2022.
@conference{salvarani_2288,
title = {Exponential convergence to consensus in finite and infinite dimensions},
author = {Francesco Salvarani},
url = {https://stakata.wordpress.com/category/workshops-conferences/},
year = {2022},
date = {2022-11-01},
booktitle = {Japan-France Joint Workshop ?Interacting Particle Systems and Fluid Mechanics : Theory and Applications?},
address = {Institut Français du Japon-Kansai, Kyoto, Japan},
keywords = {},
pubstate = {published},
tppubtype = {conference}
}
Swaminath Venkateswaran; Damien Charles Chablat
Stability analysis of tensegrity mechanism coupled with a bio- inspired piping inspection robot Conférence
47ème congrès de la Société de Biomécanique, Monastir, Tunisie, 2022.
@conference{venkateswaran_1843,
title = {Stability analysis of tensegrity mechanism coupled with a bio- inspired piping inspection robot},
author = {Swaminath Venkateswaran and Damien Charles Chablat},
url = {https://arxiv.org/ftp/arxiv/papers/2206/2206.01433.pdf},
year = {2022},
date = {2022-10-01},
booktitle = {47ème congrès de la Société de Biomécanique},
address = {Monastir, Tunisie},
abstract = {Piping inspection robots play an essential role for industries as they can reduce human effort and pose a lesser risk to their lives. Generally, the locomotion techniques of these robots can be classified into mechanical and bioinspired. By using slot-follower leg mechanisms, DC-motors, and control units, a rigid caterpillar type inspection robot was designed and developed at LS2N, France. This rigid prototype helped in identifying the static forces required to
accomplish good contact forces with the pipeline walls. In order to work inside curvatures, a tensegrity mechanism that uses three tension springs and a passive universal joint was introduced between each module of this robot. The optimal parameters of the robot assembly were identified by considering a preload of the cables, which ensured the stability of the entire robot. However, under static conditions, there exist some forces on the robot,
especially on the tensegrity mechanism when one end of the leg mechanism is clamped with the pipeline walls. These forces are dominant when the orientation of the pipeline is horizontal. The objective of this article is to understand the effect of the stiffness of
the spring on the static stability of the tensegrity mechanism under the self-weight of the robot assembly.},
keywords = {},
pubstate = {accepted},
tppubtype = {conference}
}
Ihab Taleb; Guillaume Guérard; Frédéric Fauberteau; Nga Nguyen
A Holonic Smart Grid Model for Isolated Areas Conférence
European Conference on Machine Learning and Principles and Practice of Knowledge Discovery in Databases, PhD Forum, Grenoble, France, 2022.
@conference{taleb_1934,
title = {A Holonic Smart Grid Model for Isolated Areas},
author = {Ihab Taleb and Guillaume Guérard and Frédéric Fauberteau and Nga Nguyen},
url = {https://2022.ecmlpkdd.org/index.php/phd-forum/},
year = {2022},
date = {2022-09-01},
booktitle = {European Conference on Machine Learning and Principles and Practice of Knowledge Discovery in Databases, PhD Forum},
address = {Grenoble, France},
abstract = {Since the beginning of the $21$st century, smart grid models are gaining more and more importance as they play a major role in the demand side management and the flexible integration of renewable energy sources. Indeed, diverse architectures and models have been proposed for smart grids. In this paper, we propose a model composed of two parts, the first part is to optimize, on a weekly scale, thermal generation, and energy storage while prioritizing renewable energy sources to minimize global costs and global warming effects. The second part consists of, having optimized production and storage, the negotiation between neighboring holons on the same level using evolutionary game theory, combined with simulated annealing and Q-learning approaches to ensure a back and forth between the various levels.},
keywords = {},
pubstate = {published},
tppubtype = {conference}
}
Thuy Nguyen; Daniel Bonamy
Effect of atomic-scale solid discreetness in brittle fracture problem Conférence
11th European Solid Mechanics Conference, Galway, Ireland, 2022.
@conference{nguyen_1923,
title = {Effect of atomic-scale solid discreetness in brittle fracture problem},
author = {Thuy Nguyen and Daniel Bonamy},
url = {https://www.esmc2022.org/},
year = {2022},
date = {2022-07-01},
booktitle = {11th European Solid Mechanics Conference},
address = {Galway, Ireland},
abstract = {Material's resistance-to-failure is quantified by two dependent material constants (one is proportional to the square of the other): fracture energy and fracture toughness. Predicting their values from the solid structure at the atomistic scale remains insolved, even in the simplest situation of an ideal brittle fracture. By examining numerically crack growth in electrical analogues of brittle crystals with modulated geometries, we shed a new light on this question. We find that the value of fracture energy cannot be deduced from Griffith's free surface energy, as is generally believed [1]. Rather, it finds its origin in the matching between the continuum-level scale displacement field of solid mechanics and the discrete nature of solids at the atomic scale. By making use of the generic asymptotic form, referred to as Williams's series expansion [2], taken by the displacement field near the crack tip, we find an analytical solution for this matching, and subsequently a way to predict quantitativly fracture toughness from the atomistic parameters [3]. We will discuss how to extend the analysis to genuine elastic (plane stress) crack problems and predict fracture toughness in 2D and 3D materials. This work sheds new perspectives on how resistance-to-faillure is selected; and hence, how it can be improved. As such, it may catalyze novel research toward new architectured materials of superior strcutural performance via microstructure patterning : tougher, more durable, lighter and/or combining other functionalities.},
keywords = {},
pubstate = {published},
tppubtype = {conference}
}
Benjamin Bobbia
Théorème de Donsker pour des mesures empiriques locales sur des régions aléatoires Conférence
53èmes journées de statistique de la SFDS, Lyon, France, 2022.
@conference{bobbia_1855,
title = {Théorème de Donsker pour des mesures empiriques locales sur des régions aléatoires},
author = {Benjamin Bobbia},
url = {https://jds22.sciencesconf.org/},
year = {2022},
date = {2022-06-01},
booktitle = {53èmes journées de statistique de la SFDS},
address = {Lyon, France},
abstract = {Nowadays, empirical processes are well known objects. A reason that push forward theirs studies is that, in many models, we can write the estimators as images of empirical measures. In this work we investigate the case of local empirical measures built over a sub-sample with data conditioned to be in a certain area. There exists numerous results about such question, but what can we say if the area of interest is data driven ? In the present work we present a general framework which allows to derive asymptotic results for this particular empirical measures (with "low" cost in terms of technicality and assumptions). This approach is mainly presented through the prism of extreme values theory. And we present an example illustrating how this empirical conditional measure assumption work well with optimal transport methods.},
keywords = {},
pubstate = {published},
tppubtype = {conference}
}
Francesco Salvarani
Kinetic description of polyatomic gases undergoing resonant collisions Conférence
Particle Systems and PDEs X, Braga, Portugal, 2022.
@conference{salvarani_1874,
title = {Kinetic description of polyatomic gases undergoing resonant collisions},
author = {Francesco Salvarani},
url = {https://cmat.uminho.pt/events/particle-systems-and-pdes-x},
year = {2022},
date = {2022-06-01},
booktitle = {Particle Systems and PDEs X},
address = {Braga, Portugal},
keywords = {},
pubstate = {published},
tppubtype = {conference}
}
Achraf Kallel; Joyce Dekran; Abir Ben Abdallah; Sebastien Ballut
Temperature Evolution of PLA during Filaments FFF process Conférence
3D Printing and Additive Manufacturing 2022, Copenhagen, Denmark, 2022.
@conference{kallel_2222,
title = {Temperature Evolution of PLA during Filaments FFF process},
author = {Achraf Kallel and Joyce Dekran and Abir Ben Abdallah and Sebastien Ballut},
url = {https://www.thescientistt.com/3dprinting/2022/index.php#important_dates},
year = {2022},
date = {2022-06-01},
booktitle = {3D Printing and Additive Manufacturing 2022},
address = {Copenhagen, Denmark},
keywords = {},
pubstate = {published},
tppubtype = {conference}
}
Francesco Salvarani
Applied Analysis, Complex Systems & Dynamics Seminar, Graz, Austria, 2022.
@conference{salvarani_1876,
title = {Exponential convergence towards consensus for non-symmetric linear first-order systems in finite and infinite dimensions},
author = {Francesco Salvarani},
url = {x},
year = {2022},
date = {2022-04-01},
booktitle = {Applied Analysis, Complex Systems & Dynamics Seminar},
address = {Graz, Austria},
keywords = {},
pubstate = {published},
tppubtype = {conference}
}
Benjamin Bobbia
A Dansker's Theorem for data driven local empirical measures Conférence
Séminaire de l'équipe S2A Télécom Paris, Palaiseau, France, 2022.
@conference{bobbia_1856,
title = {A Dansker's Theorem for data driven local empirical measures},
author = {Benjamin Bobbia},
url = {x},
year = {2022},
date = {2022-03-01},
booktitle = {Séminaire de l'équipe S2A Télécom Paris},
address = {Palaiseau, France},
abstract = {Nowadays, empirical processes are well known objects. A reason that push forward theirs studies is that, in many models, we can write the estimators as images of empirical measures. In this work we investigate the case of local empirical measures built over a sub-sample with data conditioned to be in a certain area. There exists numerous results about such question, but what can we say if the area of interest is data driven ? In the present work we present a general framework which allows to derive asymptotic results for this particular empirical measures (with "low" cost in terms of technicality and assumptions). In this talk, this approach is specified for the framework of extreme values theory. In which we presente how tail and quantile estimation can be derived from a such methodology.},
keywords = {},
pubstate = {published},
tppubtype = {conference}
}
Benjamin Bobbia
Donsker's Theorem for local Data-Driven Empirical Measure Conférence
Séminaire du laboratoire Modal X, Nanterre, France, 2022.
@conference{bobbia_1773,
title = {Donsker's Theorem for local Data-Driven Empirical Measure},
author = {Benjamin Bobbia},
url = {x},
year = {2022},
date = {2022-02-01},
booktitle = {Séminaire du laboratoire Modal X},
address = {Nanterre, France},
abstract = {Nowadays, empirical processes are well known objects. A reason that push forward theirs studies is that, in many models, we can write the estimators as images of empirical measures. In this work we investigate the case of local empirical measures built over a sub-sample with data conditioned to be in a certain area. There exists numerous results about such question, but what can we say if the area of interest is data driven ? In the present work we present a general framework which allows to derive asymptotic results for this particular empirical measures (with "low" cost in terms of technicality and assumptions). Then, we use this approach in the framework of extreme values theory deriving tail and quantile estimations.},
keywords = {},
pubstate = {published},
tppubtype = {conference}
}
Antoine Montiel; Paul Sargueil; Thuy Nguyen; Cindy Rountree; Valérie Geertsen; Patrick Guenoun; Daniel Bonamy
Mechanical & fracture behaviour of microlattice metamaterial with disordered architecture Conférence
Mécanique des Matériaux Architecturés, MacaMat Aussois, France, 2022.
@conference{montiel_1775,
title = {Mechanical & fracture behaviour of microlattice metamaterial with disordered architecture},
author = {Antoine Montiel and Paul Sargueil and Thuy Nguyen and Cindy Rountree and Valérie Geertsen and Patrick Guenoun and Daniel Bonamy},
url = {https://aussois2022.sciencesconf.org/},
year = {2022},
date = {2022-01-01},
booktitle = {Mécanique des Matériaux Architecturés},
address = {Aussois, France},
organization = {MacaMat},
keywords = {},
pubstate = {published},
tppubtype = {conference}
}
Fernanda Arreola; Pascal Clain
Quantum startup: using an analogy for theory development in the study of breakthrough innovation. Proceedings Article
Dans: OMT - IAE Business School PDW, Organization & Management Theory Academy of Management, Derqui, Argentina, 2022.
@inproceedings{arreola_1913,
title = {Quantum startup: using an analogy for theory development in the study of breakthrough innovation.},
author = {Fernanda Arreola and Pascal Clain},
url = {x},
year = {2022},
date = {2022-12-01},
booktitle = {OMT - IAE Business School PDW},
publisher = {Academy of Management},
address = {Derqui, Argentina},
organization = {Organization & Management Theory},
keywords = {},
pubstate = {published},
tppubtype = {inproceedings}
}
Swaminath Venkateswaran; Damien Charles Chablat
Stability analysis of tensegrity mechanism coupled with a bio- inspired piping inspection robot Proceedings Article
Dans: 47th Congress of the society of Biomechanics, Monastir, Tunisia, Monastir, Tunisia, 2022, ISBN: 1025-5842.
@inproceedings{venkateswaran_1843,
title = {Stability analysis of tensegrity mechanism coupled with a bio- inspired piping inspection robot},
author = {Swaminath Venkateswaran and Damien Charles Chablat},
url = {https://www.tandfonline.com/doi/epdf/10.1080/10255842.2022.2116885?needAccess=true&role=button},
issn = {1025-5842},
year = {2022},
date = {2022-10-01},
booktitle = {47th Congress of the society of Biomechanics, Monastir, Tunisia},
address = {Monastir, Tunisia},
abstract = {Piping inspection robots play an essential role for industries as they can reduce human effort and pose a lesser risk to their lives. Generally, the locomotion techniques of these robots can be classified into mechanical and bioinspired. By using slot-follower leg mechanisms, DC-motors, and control units, a rigid caterpillar type inspection robot was designed and developed at LS2N, France. This rigid prototype helped in identifying the static forces required to
accomplish good contact forces with the pipeline walls. In order to work inside curvatures, a tensegrity mechanism that uses three tension springs and a passive universal joint was introduced between each module of this robot. The optimal parameters of the robot assembly were identified by considering a preload of the cables, which ensured the stability of the entire robot. However, under static conditions, there exist some forces on the robot,
especially on the tensegrity mechanism when one end of the leg mechanism is clamped with the pipeline walls. These forces are dominant when the orientation of the pipeline is horizontal. The objective of this article is to understand the effect of the stiffness of
the spring on the static stability of the tensegrity mechanism under the self-weight of the robot assembly.},
keywords = {},
pubstate = {published},
tppubtype = {inproceedings}
}
Mohamed Guerich; Samir Assaf
Damping optimal design of sandwich beams partially covered with damping patches Proceedings Article
Dans: Proceedings of ISMA2022 including USD2022, Leuven, belgium, 2022, ISBN: 978-90-828931-5-1.
@inproceedings{guerich_2372,
title = {Damping optimal design of sandwich beams partially covered with damping patches},
author = {Mohamed Guerich and Samir Assaf},
url = {https://www.isma-isaac.be/isma2022},
issn = {978-90-828931-5-1},
year = {2022},
date = {2022-09-01},
booktitle = {Proceedings of ISMA2022 including USD2022},
address = {Leuven, belgium},
abstract = {The application of viscoelastic materials in the form of constrained layers in mechanical structures is an
efficient and cost-effective technique for solving noise and vibration problems. This technique requires
design tool to select the best location, type and thickness of the damping treatment. This paper presents a
finite element model for the vibration of beams partially or fully covered with a constrained viscoelastic
damping material. The model is based on Bernoulli-Euler theory for the faces and Timoshenko beam theory
for the core. The sandwich beam finite element is compatible with the conventional C1 finite element for
homogenous beams. To validate the proposed model, several free vibration analyses of fully or partially
covered beams, with different locations of the damping patches and different percent coverage are studied.
The results show that the proposed approach can be used as an effective tool to study the influence of the
location and treatment size on the natural frequencies and the associated modal loss factors.},
keywords = {},
pubstate = {published},
tppubtype = {inproceedings}
}
Guillaume Guérard; Lucas Bichet; Sofiane Ben Amor
Survey on Javascript Engines Fuzzers Proceedings Article
Dans: Springer, (Ed.): The 6th International Symposium on Cyber Security, Cryptology and Machine Learning, Springer, Virtual Event, 2022.
@inproceedings{guerard_1861,
title = {Survey on Javascript Engines Fuzzers},
author = {Guillaume Guérard and Lucas Bichet and Sofiane Ben Amor},
editor = {Springer},
url = {https://link.springer.com/book/10.1007/978-3-031-07689-3},
year = {2022},
date = {2022-07-01},
booktitle = {The 6th International Symposium on Cyber Security, Cryptology and Machine Learning},
publisher = {Springer},
address = {Virtual Event},
abstract = {The security of Web users is becoming a major issue today. Thus, Web browsers and more particularly the JavaScript engines that compose them are studied carefully to detect and promptly correct the vulnerabilities that they embed. This article presents the current state of research on vulnerabilities affecting JavaScript engines, starting from the current research context to the research tools used.},
keywords = {},
pubstate = {online},
tppubtype = {inproceedings}
}
Alessandro Biancalani; Alberto Bottino; Matteo Valerio Falessi; Thomas Hayward-Schneider; Philipp Lauber; Alexey Mishchenko; Francesco Vannini; Laurent Villard; Fulvio Zonca
Interaction of Alfvénic modes and turbulence via the nonlinear modification of the equilibrium profiles Proceedings Article
Dans: Interaction of Alfvénic modes and turbulence via the nonlinear modification of the equilibrium profiles, online, 2022, ISBN: 979-10-96389-16-2.
@inproceedings{biancalani_2217,
title = {Interaction of Alfvénic modes and turbulence via the nonlinear modification of the equilibrium profiles},
author = {Alessandro Biancalani and Alberto Bottino and Matteo Valerio Falessi and Thomas Hayward-Schneider and Philipp Lauber and Alexey Mishchenko and Francesco Vannini and Laurent Villard and Fulvio Zonca},
url = {http://ocs.ciemat.es/EPS2022PAP/html/author.html},
issn = {979-10-96389-16-2},
year = {2022},
date = {2022-07-01},
booktitle = {Interaction of Alfvénic modes and turbulence via the nonlinear modification of the equilibrium profiles},
address = {online},
abstract = {A key step towards the achievement of controlled nuclear fusion in magnetic confinement
devices is the mitigation of turbulence. Turbulent tokamak plasmas are intrinsically multiscale
systems. Microturbulence generates meso-scale zonal flows. Additionally, energetic particles
drive Alfvénic modes (AM) unstable, on meso- or macro-scales, and zonal structures.
In this work, we investigate the possible interaction of AMs and turbulence via the evolution
of the equilibrium profiles. Turbulence is known to strongly depend on the gradients of the
equilibrium profiles, for example plasma density and temperature. AMs can nonlinearly modify
the equilibrium profiles [1, 2, 3], and therefore affect turbulence. Viceversa, with the same
mechanism, turbulence can affect the AM dynamics.
We present results obtained by means of global gyrokinetic simulations with the particle-in-
cell code ORB5 [4]. In recent simulations with ORB5, AMs have been shown to carry substan-
tial heat and particle fluxes [5, 6]. Here, we extend that analysis by showing how the profile
modification due to those fluxes can affect turbulence.
References
[1] L. Chen and F. Zonca, Rev. Mod. Phys. 88, 015008 (2016)
[2] M. V. Falessi and F. Zonca, Phys. Plasmas 26, 022305 (2019)
[3] F. Zonca, L. Chen, M. V. Falessi and Z. Qiu, J. Phys. Conf. Ser. 1785, 012005 (2021)
[4] E. Lanti, et al, Comp. Phys. Commun. 251, 107072 (2020)
[5] A. Biancalani, A. Bottino, P. Lauber, A. Mishchenko and F. Vannini, J. Plasma Phys. 86, 825860301A (2020)
[6] A. Biancalani, et al, Plasma Phys. Control. Fusion 63, 065009 (2021)},
keywords = {},
pubstate = {published},
tppubtype = {inproceedings}
}
Guillaume Guérard; Ihab Taleb; Frédéric Fauberteau; Nga Nguyen
Modélisation Multi-Agent pour les Réseaux Energétique Insulaires Proceedings Article
Dans: Journées Francophones sur les Systèmes Multi-Agents, Saint-Etienne, France, 2022.
@inproceedings{guerard_1831,
title = {Modélisation Multi-Agent pour les Réseaux Energétique Insulaires},
author = {Guillaume Guérard and Ihab Taleb and Frédéric Fauberteau and Nga Nguyen},
url = {https://ci.mines-stetienne.fr/pfia2022/conferences/jfsma/},
year = {2022},
date = {2022-06-01},
booktitle = {Journées Francophones sur les Systèmes Multi-Agents},
address = {Saint-Etienne, France},
keywords = {},
pubstate = {published},
tppubtype = {inproceedings}
}
Nada Chami; Pascal Clain; Véronique Osswald; Anthony Delahaye; Laurence Fournaison; Didier Dalmazzone; Yasmine Salehy
Rheological and thermal study of mixed CP + CO2 hydrates for refrigeration applications Proceedings Article
Dans: 1th European Conference on Gas Hydrates, Lyon, France, 2022.
@inproceedings{chami_1849,
title = {Rheological and thermal study of mixed CP + CO2 hydrates for refrigeration applications},
author = {Nada Chami and Pascal Clain and Véronique Osswald and Anthony Delahaye and Laurence Fournaison and Didier Dalmazzone and Yasmine Salehy},
url = {https://ecgh2022.sciencesconf.org/},
year = {2022},
date = {2022-06-01},
booktitle = {1th European Conference on Gas Hydrates},
address = {Lyon, France},
abstract = {The use of gas hydrates in secondary refrigeration can reduce cooling environmental impact by greenhouse gas reduction because of there high energy density. CO2 hydrates was selected at previous work as a candidate material for secondary refrigeration. In this study, cyclopentane, a thermodynamic promoter that has been identified for its promotive qualities to lower the formation pressure of CO2 hydrates was used to form mixed CP + CO2 hydrate slurries. This work deploys a temperature-controlled flowloop to characterize the rheological properties of hydrate slurries generated in situ from oil-in-water emulsions. Systems of 3 - 15wt% cyclopentane fraction to form pure CP hydrate and mixed CP + CO2 hydrate slurries were tested. The results showed that the viscosity of CP and mixed CP + CO2 hydrate slurries increase with the decrease of the shear rate, exhibiting a shear-thinning behavior. With a similar protocol, a rheological characterization involving a long period of hydrate slurries circulation was conducted. The results illustrated that the hydrate slurries behavior change with time. A thermal study was performed using heating tube method applied and heat transfer coefficients were determined for different cyclopentane fraction.},
keywords = {},
pubstate = {published},
tppubtype = {inproceedings}
}
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