Emulsion stability--theoretical studies on simultaneous flocculation and creaming

Abstract

A general dynamic equation is derived describing the behavior of a polydispersed emulsion in which Brownian flocculation, sedimentation-flocculation, and creaming are taking place simultaneously. The resulting equation consists of a set of coupled partial differential equations, which are solved numerically to predict changes in particle concentration and size distribution as a function of time and position. Predictions are also made for various limiting cases, such as negligible creaming, negligible flocculation, and for various degrees of electrostatic stabilization. A cyclic change in particle size distribution is observed when flocculation and creaming occur simultaneously.