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Relative mobility of a sphere moving coaxially in a long cylindrical tube as a function of the ratio of the sphere and the tube radii. The ζ-potentials along the surfaces of the sphere and the cylindrical pore are, respectively, 1 mV and 0. The value a/λD ≈ 1. The solid line and symbols correspond, respectively, to the approximate analytical solution of Ennis and Anderson (22) and to the MIM predictions.
