抄録
Recent progresses in transport phenomena in microfiltration/ultrafiltration, in particular (i) limiting flux in crossflow microfiltration of colloidal suspensions and (ii) mass transfer coefficient in ultrafiltration under high flux conditions, are briefly summarized. This review indicates that we have to consider the situations where the drag force exerted by the flux is balanced by the lift force in the viscous sublayer to discuss (i) limiting flux in cross–flow microfiltration of colloidal suspensions. This strategy is totally different from the gel layer model and the osmotic pressure model, which was developed on the basis of the mass balance concept in boundary layers to discuss transport phenomena in reverse osmosis and ultrafiltration. This review also points out that we have to include the effect of flux on (ii) mass transfer coefficient in ultrafiltration under high flux conditions in the Deissler equation with using Peclet number. This gives us a modified Sherwood relation for estimating the mass transfer coefficient in various cases.
