Two-Phase Flow Model Based on Local Relative Velocity

抄録

Accurate estimation of the area-averaged volumetric fraction is required when we evaluate two-phase flow characteristics such as pressure drop and heat transfer. A two-phase flow model based on local relative velocity was proposed in this study. The effects of distribution of local phase velocities and local volumetric fractions on the area-averaged volumetric fractions were also taken into account in the model by introducing new distribution parameters. In order to examine the applicability of the model to the estimation of the area-averaged volumetric fractions, measured area-averaged volumetric fractions of solid-liquid flow and gas-liquid flow in vertical pipes were correlated based on the basic equation of the model. The area-averaged volumetric fractions calculated with the correlation agreed well with the experimental data. Consequently, it was confirmed that the proposed model is a useful two-phase flow model.