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Hydrodynamic dispersion in networks of capillaries of random permeabilities is calculated with an exact method for various widths of the permeability distribution. When scaled with an adequate dispersion length L d , the dependence of the dispersion coefficient D on the Peclet number Pe is independent of disorder. Results show the relation between dispersion and flow rate fluctuations, and are consistent with a percolation model for wide permeability distribution. They are in good agreement with experimental data obtained for sandstone and sintered glass beads.
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Charlaix et al. (1991) studied this question.
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