ABSTRACT
In the previous chapters, we consider the compressible flow of a simple fluid which is in one state or phase only, i.e., mainly in gas or plasma state. In such problems, the solid bodies in the flow field are usually assumed to be rigid bodies so that the solids may be considered as given boundary conditions of the fluid flow problem. As we discuss in Chapter II, liquid in most cases may be considered as an incompressible fluid. Thus in most studies in previous chapters, we did not deal with liquid flow. However, in many engineering problems as well as fluid flow in nature, we have to treat the flow problems of a mixture of substances in different states and the solid bodies may not be considered as rigid bodies and the liquid may be changed into gas or vapor. In these cases, the corresponding flow may be called multi-phase flow 1 , 2 . The most common types of multi-phase flows consist of two-phases of some substances only, i.e., any combination of two of the four phases of matter (cf. Chapter II) of the same or different substances. In this chapter, we discuss various types of two phase flows only and the results my be generalized into multiphase cases.
