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After a justification of correlating permeability and sedimentation equations, the Kozeny-Carman and Richardson-Zaki expressions are related to show how the Kozeny parameter k varies with suspension porosity, under sedimentation conditions. The variation of k with suspension composition is also illustrated; k can be very much greater than the values ( approximately 5) commonly quoted. It is predicted that maximum sedimentation mass-transfer rate will never occur at greater than 25% solids concentration by volume, and experimental data do not appear to contradict this.
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Davies et al. (1980) studied this question.
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