Abstract
Experimental results are reported from rheological measurements, and batch and cross-flow microfiltration of monodisperse latex (0.18 μm; Ackronal 290D, Akzo) suspensions with different concentrations. With hydrostatically driven flow at volume fractions higher than 0.04 the filtration channel (rectangular slit with one filtering wall) becomes plugged. At the lower volume fractions registered the steady-state cross-flow filtration parameters allow testing of different mechanisms for cake removal. Both transient and steady-state data confirm the build-up of a dense cake, which flows tangentially. Thermal (“Brownian”) diffusion back-transport contributes up to half of the steady-state filtration flux. The estimated non-Newtonian viscosity of the dense cake is consistent with the results from direct rheological measurements.
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