A theoretical analysis of some interrelationships and mechanisms of heat and mass transfer in dispersions

Some of the main interrelationships that govern heat and mass transfer in dispersions are considered. Qualitative and quantiative analyses of the effects of holdup, average residence time, surface active agents, viscosity, and average particle size on transfer rates are made for two major domains. In the first domain a convective mass transfer model is formulated for the case of low dispersed phase holdup values and a steady motion of a swarm of bubbles with clean interfaces. A second domain is established for high dispersed phase holdup values and fine dispersions that contain surfactants. A semidynamic model for unsteady state heat (or mass) transfer from a swarm of droplets in a multistage liquid-liquid disperser is demonstrated in this domain by a simultaneous solution of two differential equations (one for each phase).