Hydrodynamics of Two-Phase Flow Across Horizontal In-line and Staggered Rod Bundles

Abstract

The void fraction and friction pressure drop measurements have been made for vertical two-phase flow of air-water across staggered and in-line rod bundles with different pitch-to-diameter ratios. All void fraction data showed a strong mass velocity effect and were significantly less than the values predicted by a homogeneous flow model, but were well correlated using the dimensionless gas velocity, jg * . The two-phase friction multiplier data could be well correlated with the Martinelli parameter for G > 200 kg/m2 s. The correlations developed for void fraction and two-phase friction multiplier were successfully tested in predicting the total pressure drop in boiling R-113 experiments.