The use of concurrent flow of liquid and gas mixtures in indus-trial components such as evaporators, gas pipelines, and heat exchangers has prompted a detailed investigation of the interaction of the variables associated with this phenomenon.nPrevious investigators have dealt with: (a) analytical studies based on physical models of idealized flow patterns, such as the theo¬retical treatment of the annular flow mo del by Levy;(1)* (b) experimen¬tal investigations concerning the relationships among the variables associated with two-phase flow, such as Richardson's (2) study on the effect of a sudden change in the flow area on the significant flow param-eters for air-water mixtures;(c) combinations of theoretical and ex-perimental investigations resulting in semi-empirical correlations, such as the studies of Martinelli et al., (3,4,5) in which a macroscopic analysis of the flow phenomenon resulted in the prediction of the void volume fraction and the static two-phase pressure drop in single and two-phase, two-component flow.
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