Hindered Settling in a Centrifuge

The relation between concentration of the discharged centrifuge solids and feed flow rate, via residence time within the machine, can be illustrated by considering the effect of hindered settling on the suspension in a bowl-type centrifuge. 

The residence time for the top of the suspension to travel fiom r to is the same as the time required to travel axially down the machine, assuming plug flow. The axial residence time is again giv by Equation (8.3), the radial reddence time is  

Many expressions exist for permeability, one of the most suitable for settling sospenaons can be derived from Equation (3.21), noting that s = -C thus  

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