Reference : Equivalent diffusion coefficient and equivalent diffusion accessible porosity of a st...
Scientific journals : Article
Engineering, computing & technology : Geological, petroleum & mining engineering
Equivalent diffusion coefficient and equivalent diffusion accessible porosity of a stratified porous medium
Huysmans, Marijke [>KULeuven > > >Department of Earth and Environmental Sciences > Applied geology and mineralogy > >]
Dassargues, Alain mailto [Université de Liège - ULiège > Département Argenco : Secteur GEO3 > Hydrogéologie & Géologie de l'environnement >]
Transport in Porous Media
Yes (verified by ORBi)
New York
[en] diffusion ; equivalent parameters ; low permeability media ; groundwater ; solute transport
[fr] diffusion effective coefficient
[en] Diffusion is an important transport process in low permeability media, which play an important role in contamination and remediation of natural environments. The calculation of equivalent diffusion parameters has however not been extensively explored. In this paper, expressions of the equivalent diffusion coefficient and the equivalent diffusion accessible porosity normal to the layering in a layered porous medium are derived based on analytical solutions of the diffusion equation. The expressions show that the equivalent diffusion coefficient changes with time. It is equal to the power average with p = -0.5 for small times and converges to the harmonic average for large times. The equivalent diffusion accessible porosity is the harmonic average of the porosities of the individual layers for all times. The expressions are verified numerically for several test cases.
Aquapôle - AQUAPOLE
Researchers ; Professionals
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