In this study, the validity of 20 nonboiling heat transfer correlations obtained from a comprehensive literature review are assessed. These correlations were tested against seven extensive sets of two-phase flow experimental data available from the literature, for vertical and horizontal tubes and different flow patterns and fluids. A total of 524 data points from five available experimental studies (which included the seven sets of data) were used for these comparisons. Based on the tabulated and graphical results of the comparisons with and without considering author-specified ranges of applicability, appropriate correlations for different flow patterns and tube orientations are recommended.