Comparison of void fraction correlations for two-phase flow in horizontal and upward inclined flows

Scope and method of study. An extensive literature search was made for the available void fraction correlations and experimental void fraction data. After systematically refining the data, the performance of the correlations in correctly predicting the diverse data sets was evaluated. Comparisons between the correlations were made and appropriate recommendations drawn. An improved version of one of the top performing correlations was also suggested by introducing physical parameters backed by plausible arguments that capture the physics of the problem.; Findings and conclusions. The analysis showed that most of the correlations developed are very restricted in terms of handling a wide variety of data sets. Based on the recommendations made, an improved void fraction correlation which could acceptably handle all data sets regardless of flow patterns for horizontal and upward inclination angles was suggested. It was shown that this correlation has the best predictive capability than all the correlations considered in this study.