Two-Phase Flows pp 1-14 | Cite as

# Introduction: Classification of Two-Phase Flows

## Abstract

Before we study two-phase flows, we should give a definition of two-phase flow. By two-phase flow, we means a special flow problem in which we have to consider the mechanics of two phases of matter simultaneously. From the macroscopic description of matter, it is well known that we may divide the matter into four phases or states (see Chapter II): solid, liquid, gas, and plasma (ionized gas). Except for the solid state, matter in the other three states may be deformed without applying any force, provided that the change of shape takes place over a sufficiently long time. The term *fluid* has been used as a general name for the three states of matter: liquid, gas, and plasma. Furthermore, when a large number of small solid particles flow in a fluid, if the velocity of the fluid is sufficiently high, the behavior of such solids is similar to ordinary fluid. We may consider these solid particles as a pseudo-fluid. Under proper conditions, we may treat fluid flow problems for solid (pseudo-fluid), liquid, gas and plasma.

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