局所相対速度に基づく二相流のモデル

概要

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Accurate estimation of area-averaged volumetric fractions is required when we evaluate two-phase flow characteristics such as pressure drop and heat transfer. A two-phase flow model based on a local relative velocity is proposed in this study. The effects of distribution of local phase velocities and local volumetric fractions on the area-averaged volumetric fractions are also taken into account in this model by introducing new distribution parameters. In order to examine the applicability of this model to the estimation of the area-averaged volumetric fractions, measured area-averaged volumetric fractions of solid-liquid flow and gas-liquid bubbly flow in vertical pipes were correlated based on the basic equation of this model. The area-averaged volumetric fractions calculated by the correlation agreed well with the experimental data. Therefore, it was confirmed that this model is a useful two-phase flow model.
1991-05-25