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/m2s. 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.
Hydrodynamics of Two-Phase Flow Across Horizontal In-line and Staggered Rod Bundles
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Dowlati, R., Chan, A. M. C., and Kawaji, M. (September 1, 1992). "Hydrodynamics of Two-Phase Flow Across Horizontal In-line and Staggered Rod Bundles." ASME. J. Fluids Eng. September 1992; 114(3): 450–456. https://doi.org/10.1115/1.2910052
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