Abstract
A new simple mathematical model for calculating the chemical activity coefficients of ions in electrolytic solutions is presented. The model was developed to account for the particular behavior of concentrated solutions for which short-range and long-range interactions between ions are important. The new model is essentially a modified version of the Davies equation. Given its simple mathematical form, it can be easily implemented in a numerical code aimed at modeling ionic transport phenomena in saturated porous materials. The transport equations of charged particles in concentrated solutions are also presented. Numerical results are shown and compared with experimental results. Applications of the model to ionic diffusion problems in saturated porous media are also shown.
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