An analytical treatment for the sedimentation rate of disordered suspensions is presented in the context of a resistance problem. From the calculation it is confirmed that the lubrication effect is important in contrast to the suggestion by Brady and Durlofsky [J. F. Brady and L. J. Durlofsky, Phys. Fluids 31, 717 (1988)]. The calculated sedimentation rate agrees well with the experimental results throughout the range of the volume fraction.
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Hayakawa et al. (1995) studied this question.
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