Longitudinal and transverse diffusion in granular deposits
The flow of liquids through porous media is defined by Darcy’s law when bulk movement is considered. In several cases, however, it is of interest to know how elements of volume or discrete particles carried by the liquid will travell. For instance, in the study of ground-water movement, radio active salts are injected into the soil. The salt will travel through different pores and after a given interval of time will arrive at different places, their distance from the starting point being dependent upon how tortuous was the path they followed.
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