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Two-Phase Flow

For every simple problem, there is a complex solution that is wrong.”

—Anonymous

I.    SCOPE

The term “two-phase flow” covers an extremely broad range of situations, and it is possible to address only a small portion of this spectrum in one book, let alone one chapter. A “two-phase flow” includes any combination of two of the three phases: solid, liquid, and gas, that is, solid–liquid, gas–liquid, solid–gas, or liquid–liquid. Also, if both phases are fluids (combinations of liquid and/or gas), one of the phases may be continuous and the other distributed (e.g., gas in liquid or liquid in gas). Furthermore, the mass ratio of the two phases may be fixed or variable throughout the system. Examples of the former are nonvolatile ...

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