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dispersion in an isotropic porous medium is anisotropic; it is described by the two dispersivity constants a1 and a11• The physical meaning of these constants becomes obvious if one makes the following mental experiment. Let us consider an experiment where the velocity has the components v = (v, 0, 0). Then, the fundamental diffusivity equation ( becomes ( Thus, the measured longitudinal D1001 and transverse D1at factors of dispersion turnout to be D1on1 = OiV, D1at = auv. ( ( The above result was also deduced by Bachmat