ABSTRACT
The significance of the configurations of the interfaces of phases is readily seen by considering the simple cases represented by the Bernoulli equation of phases and their mixture. The basic equations with boundary conditions give a deterministic solution for the averaged dependent variables, including the configuration of the interfaces. Simplified formulations are found in the idealized cases of pure stratified flow and highly dispersed flow, both consist of partial differential equations only. The general multiphase flow system consists of phases of solid, liquid, or vapor separated by interfaces of any configurations. “Multiphase” arises from different dynamic phases because of different responses of different parts of the physical phase of the same material due to their local configurations. While the general equations are applicable to all configurations of interfaces, their solution at this stage of development of multiphase flow is limited to a highly dispersed flow or a pure stratified flow system.
