Effective thermal conductivity of a wet porous medium – presence of hysteresis when modeling the spatial water distribution for the pendular regime

Abstract : This paper deals with the heat transfer between two spherical grains separated by a small gap; dry air is located outside the grains and a liquid water meniscus is supposed to be present between them. This problem can be seen as a micro-scale cell of an assembly of solid grains, for which we are looking for the effective thermal conductivity. For a fixed contact angle and according to the volume of the liquid meniscus, two different shapes are possible for the meniscus, giving a "contacting" state (when the liquid makes a true bridge between the two spheres) and a "non-contacting" one (when the liquid is split in two different drops, separated by a thin air layer); the transition between these two states occurs at different times when increasing or decreasing the liquid volume, thus leading to a hysteresis behavior when computing the thermal flux across the domain.
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Communication dans un congrès
Hasnaoui, M. and Saghir, M. Z. Seventh Int. Conf. on Thermal Engineering (ICTEA 2014), May 2014, Marrakesh, Morocco. pp.4, 2014, 〈http://www.ictea.ca/2014/〉
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Dernière modification le : jeudi 15 novembre 2018 - 11:57:18
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  • HAL Id : hal-01095522, version 1

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Édouard Canot, Renaud Delannay, Salwa Mansour, Mohamad Muhieddine, Ramiro March. Effective thermal conductivity of a wet porous medium – presence of hysteresis when modeling the spatial water distribution for the pendular regime. Hasnaoui, M. and Saghir, M. Z. Seventh Int. Conf. on Thermal Engineering (ICTEA 2014), May 2014, Marrakesh, Morocco. pp.4, 2014, 〈http://www.ictea.ca/2014/〉. 〈hal-01095522〉

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