Pascal Clain

@article{chami_1564,

title = {Thermodynamic characterization of mixed gas hydrates in the presence of cyclopentane as guest molecule for an application in secondary refrigeration},

author = {Nada Chami and Sabrina Bendjenni and Pascal Clain and Véronique Osswald and Anthony Delahaye and Laurence Fournaison and Didier Dalmazzone},

url = {https://www.sciencedirect.com/science/article/pii/S0009250921003559},

year  = {2021},

date = {2021-11-01},

journal = {Chemical Engineering Journal},

volume = {244},

number = {-},

pages = {116790},

abstract = {Gas hydrates have drawn the attention of many scientists because of their potential role in energy applications. By using some thermodynamic promoters, it is possible to form hydrates at reduced pressure and near ambient temperature, which are suitable formation conditions for most industries. In this study, a high pressure micro differential scanning calorimeter was used to measure the dissociation conditions of mixed cyclopentane (c-C5H10) + CO2 hydrates in the system composed of liquid water + liquid hydrocarbon + hydrate + vapour, in a pressure range of 0 to 4.3 MPa in a temperature range of 280 to 292 K. The analysis of the heat flow curve allowed the direct determination of the dissociation enthalpy of c-C5H10 + CO2 hydrates (e.g., ?H=462.5±1.5 kJ. kg-1 water at equilibrium pressure 0.25 MPa) and the average mass heat capacity of c-C5H10 + CO2 hydrates in a temperature range o 277.9-281.2 K (CpH = 1479.09 ± 137.43 J. K-1. kg-1 hydrate at 0.25 MPa).},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{benmesbah_1563,

title = {Methane Hydrate Formation and Dissociation in Sand Media: Effect of Water Saturation, Gas Flowrate and Particle Size},

author = {Fatima Benmesbah and Livio Ruffine and Pascal Clain and Véronique Osswald and Olivia Fandino and Laurence Fournaison and Anthony Delahaye},

url = {https://www.mdpi.com/1996-1073/13/19/5200},

year  = {2020},

date = {2020-10-01},

journal = {Energies},

volume = {13},

number = {19},

pages = {5200},

abstract = {Assessing the influence of key parameters governing the formation of hydrates and determining the capacity of the latter to store gaseous molecules is needed to improve our understanding of the role of natural gas hydrates in the oceanic methane cycle. Such knowledge will also support the development of new industrial processes and technologies such as those related to thermal energy storage. In this study, high-pressure laboratory methane hydrate formation and dissociation experiments were carried out in a sandy matrix at a temperature around 276.65 K. Methane was continuously injected at constant flowrate to allow hydrate formation over the course of the injection step. The influence of water saturation, methane injection flowrate and particle size on hydrate formation kinetics and methane storage capacity were investigated. Six water saturations (10.8%, 21.6%, 33%, 43.9%, 55% and 66.3%), three gas flowrates (29, 58 and 78 mLn min?1) and three classes of particle size (80-140, 315-450 and 80-450 µm) were tested, and the resulting data were tabulated. Overall, the measured induction time obtained at 53-57% water saturation has an average value of 58 ± 14 min minutes with clear discrepancies that express the stochastic nature of hydrate nucleation, and/or results from the heterogeneity in the porosity and permeability fields of the sandy core due to heterogeneous particles. Besides, the results emphasize a clear link between the gas injection flowrate and the induction time whatever the particle size and water saturation. An increase in the gas flowrate from 29 to 78 mLn min-1 is accompanied by a decrease in the induction time up to 100 min (i.e., 77% decrease). However, such clear behaviour is less conspicuous when varying either the particle size or the water saturation. Likewise, the volume of hydrate-bound methane increases with increasing water saturation. This study showed that water is not totally converted into hydrates and most of the calculated conversion ratios are around 74-84%, with the lowest value of 49.5% conversion at 54% of water saturation and the highest values of 97.8% for the lowest water saturation (10.8%). Comparison with similar experiments in the literature is also carried out herein.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{boufares_538,

title = {Kinetic study of CO2 hydrates crystallization: Characterization using FTIR/ATR spectroscopy and contribution modeling of equilibrium/non-equilibrium phase-behavior},

author = {Amokrane Boufares and Elise Provost and Didier Dalmazzone and Véronique Osswald and Pascal Clain and Anthony Delahaye and Laurence Fournaison},

url = {https://www.sciencedirect.com/science/article/pii/S0009250918305451?via%3Dihub},

year  = {2018},

date = {2018-08-01},

journal = {Chemical Engineering Science},

volume = {192},

pages = {371-379},

abstract = {Gas hydrates are regarded as promising materials for various potential applications. In particular, CO2 hydrates are known for their cold storage capacities, related to their high latent heat of melting. They could be used as high efficiency Phase Change Materials in Phase Change Slurries for secondary refrigeration loops. A better understanding of the crystallization mechanism of CO2 hydrates in slurries and of the resulting formation kinetics is still needed to evaluate and improve the efficiency of hydrate-based secondary refrigeration process. For that purpose, in the present work the real-time evolution of CO2 concentration in the liquid phase was measured in situ during hydrate formation. CO2 hydrates were formed within a stirred reactor equipped with an Attenuated Total Reflection probe coupled with a Fourier Transform Infra-Red spectroscopy analyzer. By comparing the measured concentration to calculations based on the assumptions of (a) a liquidvapor equilibrium (LVE) and (b) a hydrate-liquid equilibrium (HLE), it was deduced that the crystallization kinetic is limited by CO2 transfers from the vapor phase to the liquid phase, whatever the experimental conditions tested. As soon as hydrates start forming, the CO2 concentration in the liquid phase almost instantaneously reaches the hydrate-vapor equilibrium (HVE) value at the experimental temperature, while the reactor pressure slowly decreases towards the LVE value defined by Henry's law. Different stirring speeds were experimented in order to check the effect of enhancing CO2 dissolution during hydrate formation. This resulted in faster dissolution of CO2, though still transfer-limited formation kinetics.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{salehy_625,

title = {Rheological study on CO2 hydrate slurries for secondary refrigeration},

author = {Yasmine Salehy and Pascal Clain and Amokrane Boufares and Véronique Osswald and Anthony Delahaye and Laurence Fournaison},

url = {https://www.lmaleidykla.lt/ojs/index.php/energetika/article/view/3561},

year  = {2017},

date = {2017-11-22},

journal = {Energetika},

volume = {63},

number = {3},

pages = {105-112},

abstract = {To help the fight against climate change, the Kigali deal has planned to eliminate hydrofluorocarbon's use (HFC) in industrial systems. HFCs are powerful greenhouse gases with a high global warming potential. Moreover, HFCs are commonly used as refrigerant within secondary refrigeration processes for cold production. A solution to limit their negative environmental impact would be to reduce the amount of HFC by using a phase change slurries (PCS) in the secondary loop. A PCS is composed of solid phase change particles (solid-liquid) in a liquid transportation phase. Clathrate hydrates are crystalline particles where gas molecules are trapped in water cages. Due to their high energy densities, hydrate slurries, in particular CO2 hydrates, are relevant two-phase secondary fluids because they enhance the energy efficiency of secondary refrigeration systems. In this study, the rheological behaviour of CO2 hydrate slurries in various experimental conditions on a dynamic loop for cold distribution was investigated. An exhaustive state-of-the-art on the rheological studies of hydrate slurries in aqueous solution has pointed out that hydrate slurries are non-Newtonian fluids. However, the rheological behaviour could be different for a same kind of hydrate slurry according to the literature. Moreover, the literature review also highlighted that the most used measurement method for the apparent viscosity is the capillary viscometer. We used a semi-empirical Herschel-Bulkley's model for determining the apparent viscosity of the CO2 hydrate slurry as a function of the hydrate slurry fraction. This work is primordial for designing and sizing a new efficient refrigeration system based on this innovative material.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{dufour_168,

title = {Impact of pressure on the dynamic behavior of CO2 hydrate slurry in a stirred tank reactor applied to cold thermal energy storage},

author = {Thomas Dufour and Hong Minh Hoang and Jérémy Oignet and Véronique Osswald and Pascal Clain and Laurence Fournaison and Anthony Delahaye},

url = {https://www.sciencedirect.com/science/article/abs/pii/S0306261917309704?via%3Dihub},

year  = {2017},

date = {2017-10-01},

journal = {Applied Energy},

volume = {204},

pages = {641-652},

abstract = {Phase change material (PCM) slurries are considered as high-performance fluids for secondary refrigeration and cold thermal energy storage (CTES) systems thanks to their high energy density. Nevertheless, the efficiency of such system is limited by storage dynamic. In fact, PCM charging or discharging rate is governed by system design (storage tank, heat exchanger), heat transfer fluid temperature and flow rate (cold or hot source), and PCM temperature. However, with classical PCM (ice, paraffin...), phase change temperature depends only on material/fluid nature and composition. In the case of gas hydrates, phase change temperature is also controlled by pressure. In the current work, the influence of pressure on cold storage with gas hydrates was studied experimentally using a stirred tank reactor equipped with a cooling jacket. A tank reactor model was also developed to assess the efficiency of this storage process. The results showed that pressure can be used to adjust phase change temperature of CO2 hydrates, and consequently charging/discharging time. For the same operating conditions and during the same charging time, the amount of stored energy using CO2 hydrates can be three times higher than that using water. By increasing the initial pressure from 2.45 to 3.2 MPa (at 282.15 K), it is also possible to decrease the charging time by a factor of 3. Finally, it appears that the capacity of pressure to increase CO2-hydrate phase-change temperature can also improve system efficiency by decreasing thermal losses.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{oignet_68,

title = {Rheological study of CO2 hydrate slurry in the presence of Sodium Dodecyl Sulfate in a secondary refrigeration loop},

author = {Jérémy Oignet and Anthony Delahaye and Jean-Philippe Torré and Christophe Dicharry and Hong Minh Hoang and Pascal Clain and Véronique Osswald and Ziad Youssef and Laurence Fournaison},

url = {https://www.sciencedirect.com/science/article/pii/S0009250916305486?via%3Dihub},

year  = {2017},

date = {2017-03-01},

journal = {Chemical Engineering Science},

volume = {158},

pages = {p294-p303},

abstract = {Secondary refrigeration and thermal energy storage are promising solutions to enhance the performance of refrigeration systems and reduce the impact of refrigerants on the environment. To improve the energy efficiency of secondary refrigeration loops, phase change material (PCM) slurries with a high energy density, such as CO2 hydrate slurries, can be used as a secondary refrigerant. In addition, hydrate-based processes could be an innovative option to capture CO2 from flue gas. In both applications, the rheological properties of the CO2 hydrate slurry have to be controlled.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{clain_340,

title = {Particle size distribution of TBPB hydrates by focused beam reflectance measurement (FBRM) for secondary refrigeration application},

author = {Pascal Clain and Fatou-Toutie Ndoye and Anthony Delahaye and Laurence Fournaison and Wei Lin and Didier Dalmazzone},

url = {http://www.sciencedirect.com/science/article/pii/S0140700714002886},

year  = {2015},

date = {2015-03-01},

journal = {International Journal Of Refrigeration-Revue Internationale Du Froid},

volume = {50},

pages = {19-31},

abstract = {Particle size distribution of TBPB hydrates by focused beam reflectance measurement (FBRM) for secondary refrigeration application?,},

keywords = {},

pubstate = {published},

tppubtype = {article}

}