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A local thermal non-equilibrium model for coupled heat and mass transfer with dispersion and thermal diffusion in porous media

Davarzani, Hossein and Marcoux, Manuel and Quintard, Michel A local thermal non-equilibrium model for coupled heat and mass transfer with dispersion and thermal diffusion in porous media. (2021) Journal of Porous Media, 24 (11). 37-63. ISSN 1091-028X

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Official URL: https://doi.org/10.1615/JPorMedia.2021037810

Abstract

A theoretical model is proposed to predict Darcy-scale mass transport in porous media coupled with non-equilibrium heat transfer and taking into account the thermal diffusion process. A volume-averaging technique was used with approximations leading to a two-equation or two-temperature model for the macro-scale energy balance equations. Because of Soret effect, the concentration deviation with respect to the averaged value is a function of concentration and temperature gradients in the fluid phase, the temperature gradient in the solid phase, and the difference between the two averaged temperatures. The mapping between deviations and averages involves four closure problems for the mass transport equations: problems which were solved numerically over a two-dimensional periodic-unit cell for evaluation purposes. The results show that the effective coefficients depend strongly on the thermo-physical properties of the medium and the Péclet number. In particular, the effective-Soret coefficient in porous media changes with the Péclet number and the phases thermal conductivity ratio.

Item Type:Article
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Université de Toulouse > Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UT3 (FRANCE)
French research institutions > Bureau de Recherches Géologiques et Minières - BRGM (FRANCE)
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Deposited On:09 Jul 2021 07:05

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