Abstract
A model allowing for binary and interfacial coalesecence of drops is presented which predicts the variation in dispersion height, throughput, droplet velocity and diameter along the length of a horizontal settler operating at the steady-state. Experimental results obtained in a such a box-settler verify the model which is applicable to both wedge-shaped and deep-bed dispersion bands of varying thickness. The analysis is extended to include the variation in hold-up, drop diameter and relative velocity in the sedimentation zone of a vertical settler under both laminar and turbulent flow conditions. Equations are presented which enable the height of the sedimentation zone to be predicted from the throughput, phase ratio, hold-up and binary coalescence time.
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