The problem of predicting flow patterns during condensation inside horizontal tubes is discussed. Using the condensation flow pattern data of several investigators, a new flow regimes map with dimensionless gas velocity jg* as ordinate and (1-α)/α as abscissa, where α is the void fraction, is generated. Based on these data, a set of new criteria for the transition between different flow regimes is suggested. The proposed flow regimes map gives excellent agreement for annular, semiannular, and wavy flows which exist over a major part of the condensing length during condensation inside horizontal tubes.

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