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Article Dans Une Revue Transport in Porous Media Année : 2015

A Micromechanics Model for Solute Diffusion Coefficient in Unsaturated Granular Materials

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1
Rongwei Yang
  • Fonction : Auteur
Éric Lemarchand
Teddy Fen-Chong

Résumé

A new micromechanics analysis of solute diffusion in unsaturated granular materials is put forward. This permits predicting the percolation effect. To do so, the pore water is divided up into four phases that account for the different spatial distributions and diffusion properties: interconnected capillary water, isolated capillary water, wetting layer and water film. A parameter denoted as connectivity ratio is introduced to account for the connectivity of the capillary pore water. Our model agrees well with experimental results on unsaturated sands and glass beads from literature. It also permits interpreting the physical meaning of the saturation exponent of Archie’s law: The latter is found to be correlated with the connectivity ratio of the unsaturated granular materials.
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Dates et versions

hal-01252164 , version 1 (07-01-2016)

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Rongwei Yang, Éric Lemarchand, Teddy Fen-Chong. A Micromechanics Model for Solute Diffusion Coefficient in Unsaturated Granular Materials. Transport in Porous Media, 2015, pp.1-22. ⟨10.1007/s11242-015-0597-3⟩. ⟨hal-01252164⟩
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