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Filtration of Incompressible Materials Filtration involves the production of a porous bed of particles through which the suspending medium flows. It therefore involves flow through a porous medium whose thickness (and other properties) change with throughput. As particles forming the bed (or cake) are usually small and flow velocities low, the regime is usually streamline. The superficial flow velocity (uc) is therefore well represented by application of the Kozeny's equation:- 1 dV 1 e3 ??P uc = ? ? = ? ?? ?? [1] A dt 5 (1 ? e)2S2 µl where A is the total cross sectional area of the cake V is the volume of filtrate passed in time t e is the voidage of the cake S the specific surface of the particles therein l the thickness of the cake µ the viscosity of the filtrate ?P the applied pressure difference. If the particles are rigid and so non-compressible and e is constant then the quantity e3/[5(1?e)2S2] [2] is...

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