FRAGMENTATION AND COALESCENCE DYNAMICS IN MULTIPHASE FLOWS

There are many processes in nature and technology in which the time needed for fluid fragmentation or coalescence is comparable to the characteristic time of the investigated macroscopic physical phenomenon. Thus methods and models are needed to generalize laboratory observations, in order to adequately model fragmentation and coalescence dynamics and their influence on system behavior of flows. This review contains constitutive models for particle and jet fragmentation dynamics as well as models for the reverse process, the dynamics of the coalescence of particles in pools and channels due to acceleration- and turbulence-induced instabilities. The purpose of the review is to summarize the formalized experimental and theoretical information from the point of view of possible implementation in computer codes for mathematical modeling of transient multiphase flows.