Numerical estimation of effective diffusion coefficients for charged porous materials based on micro-scale analyses
Arash Mohajeri, Guillermo A Narsilio, Peter Pivonka, David W Smith
COMPUTERS AND GEOTECHNICS | ELSEVIER SCI LTD | Published : 2010
In order to describe diffusive transport of solutes through a porous material, estimation of effective diffusion coefficients is required. It has been shown theoretically that in the case of uncharged porous materials the effective diffusion coefficient of solutes is a function of the pore morphology of the material and can be described by the tortuosity (tensor) (Bear, 1988 ). Given detailed information of the pore geometry at the micro-scale the tortuosity of different materials can be accurately estimated using homogenization procedures. However, many engineering materials (e.g., clays and shales) are characterized by electrical surface charges on particles of the porous material which..View full abstract
The authors are grateful to the Australian Research Council (ARC) for Discovery Project funding provided. Partial support was also provided by the Geotechnical Group at Melbourne University. We thank the reviewers for valuable suggestions.