Properties based on tortuosity

Abstract

This chapter was originally devoted to the subject of solute dispersion and indeed dispersion still makes up the greater part of the chapter. We have expanded our treatment of dispersion to address a wider range of experimental conditions, including the previously ignored unsaturated case, as well as a wider range of medium models. We have also added comparisons with over 2000 experimental results. We demonstrate that our predicted dependence of typical arrival times on system length explains some long-unexplained results out of dispersive transport in transient photoconductivity. The non-linear dependence of arrival time on distance generates a length dependence of the typical solute velocity (Sect. 11.5), which has implications for the spatio-temporal scaling of reaction rates in porous media as well. © 2014 Springer International Publishing Switzerland.