The writer finds the paper most valuable, because he [Cole, 1957] has made experiments with columns of granular material, basically similar to those described by the author, in order to determine the relative importance of: Effect (a) radial molecular diffusion in each pore combined with a velocity gradient across the pore, and Effect (b) the geometry of the pore system, in producing a longitudinal dispersion of an injected substance.
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G. De Josselin de Jong (1958) studied this question.
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