Study on gas velocity distribution of gas-liquid stratified flow based on numerical simulation and PIV

Abstract

The velocity is an important parameter for the fluid flow characteristics in the two-phase flow. In the gas-liquid two-phase stratified flow, the most easily obvious force equilibrium point is at the peak point of the gas phase velocity. This study is of great significance for constructing the two-phase stratified flow model. In this paper, the flow field characteristics of the gas-liquid stratified flow are investigated by numerical simulation and a theoretical model of the gas phase peak velocity position is established. The accuracy of numerical simulation is illustrated by comparing classical prediction model and PIV experimental data. The results indicate that the position of gas-liquid interface moves down and the position of gas phase peak velocity moves up with an increase in gas mass flow rate. Conversely, when gas phase mass flow rate is constant, the position of gas-liquid interface moves up and the position of gas phase peak velocity moves down with an increase in liquid mass flow rate. By exploring the relationship between the position of the peak gas velocity point and ratio of the Reynolds number, it is found that the position of the gas peak velocity has a linear relationship with the gas-liquid Reynolds number. The multiple correlation coefficient is 0.85, obtained by linear regression fitting which stated that there is a strong linear relationship between the two variables.