垂直管内低質量速度気液二相流の流動特性に関する研究

概要

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Low-mass-velocity two-phase flow in a vertical pipe shows lower void fraction than high-mass-velocity two-phase flow even though their qualities are same. In order to clarify the flow characteristics of the low-mass-velocity two-phase flow, air-water two-phase flow experiments were conducted under the froth or annular flow conditions.　Experimental results show that measured water film average velocity is negative under some condition even though both gas and liquid superficial velocities are positive. Wall shear stress is positive under this condition. These results indicate that local flow reversal should exist along the channel wall. This local flow reversal gives rise to the low void fraction in low-mass-velocity two-phase flow.　A new method was developed to predict flow characteristics of the low mass velocity two-phase flow with local flow reversal. This method is based on a concept that minimum pressure energy consumption rate is established in the most stable two-phase flow. It is demonstrated that this method can predict the flow characteristics of low mass velocity two-phase flow with local water downflow without using empirical friction factors. Constants of a turbulent model adopted in the present method is optimized with the present experimental data.
山形大学の論文
1995-01-31