Abstract
The rheological behaviour of polydisperse bentonite and monodisperse latex aqueous suspensions has been established experimentally. Both exhibit a pronounced pseudoplasticity which diminishes with decreasing particulate concentration. The rheological data are parameterised by making use of different empirical rheological “models”. During continuous microfiltration in cross-flow mode the filter cake is subjected to tangential stress. Depending on rheological properties and hydrodynamic conditions the cake may be mobile or immobile. According to the convective model of microfiltration tangential outflow of a mobile cake can ensure continuous operation. Taking into account the contribution of diffusive back-transport, the approximate analytical expressions of the convective model and cross-flow microfiltration experimental data are used to estimate indirectly the non-Newtonian (“apparent”) viscosity of the concentrated filtration cakes. These indirect estimates are in reasonable agreement with the direct rheological results.
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