Two-phase Flow Heat Transfer Correlations for Refrigerant-Oil Mixture Flows Inside Augmented Tubes

摘要

General correlations to predict boiling and condensation heat transfer coefficients are proposed. Data analyzed included condensation and evaporation of refrigerants such as R-22, R-12, R113, and R-134a, in both the low-fin tubes and the micro-fin tubes. Wide ranges of mass flux, heat flux, pressure, and vpor velocities were considered. For the boiling process, more than 975 data points from four published experimental studies were correlated, and for condensation more than 525 data points from three experimental studies were correlated.