Sedimentation of polydisperse concentrated suspensions

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Abstract
Gravity sedimentation of bidisperse and tridiperse concentrated suspensions have been studied both theoretically and experimentally. Experimental data were collected from batch settling tests using fully‐characterized colored spherical particles. Ten sizes of particles with three different densities were used in the sedimentation experiments. Varying proportions of each size were used and total solids concentration ranged from 13% to 45% by volume. Previously published and newly collected data were compared with predictions from six available models. These models include those of Lockett and Al‐Habbooby (1973), Mirza and Richardson (1979), Masliyah (1979), Reed and Anderson (1980), Selim et al. (1983a, 1983b), and Patwardhan and Tien (1985). Based on the present study and a similar study by Law et al. (1987) on bidisperse suspensions of heavy (sinking) and light (buoyant) particles, it is found that the Selim et al. model represents the data more accurately as compared to the other models.

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