11.8. Two-phase pressure drop
Pressure drop is an important consideration in the design of heat transfer equipment and more so for two-phase flows. Two-phase drop involves the pressure drop due to wall and interfacial shear stresses, the acceleration pressure drop for the case of evaporating flows, and the pressure drop due to gravitational head. The homogenous model and the separated flow model are usually used to estimate the two-phase pressure drop. The separated flow model, which is more complex, makes better prediction than the homogenous model but is beyond the scope of the present study. The interested reader can refer to advanced texts, such as Collier and Thome (1994) and Stephan (1992).
The homogenous model is based on the following ...
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