Filtration and Permeation in Centrifugation

The early work [Maloney, 1946 Hassett, 1956 Storrow Burak, 1950 Grace, 1953 Storrow Haruni, 1952] resulted in equations which could be used to estimate permeation (wash) times (Equation 8.46) and filtration time (Equation 8.47)  

Grace included the medium resistance in his work to produce  

A serious limitation in the data collected by these researchers was the ct that a was measured in permeation rather than in filtration conditions the packing (porosity) and the resistance of newly formed filter cake under the dynamic ccmditions obtaining during filtration may be e ected (in general) to be different fi om those applying after prolonged rotation The latter results in the densest packing and hipest a values. 

A full derivation of this basic relationsh is presented in Section 8.4.11. 

The term w may be evaluated firom the shiny concentration and w = cV/Am- The pressure drop is calculated fi-om the hydrostatic pressure created by caitrifiigal force to yield  

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