This study adopts a drift flux model based on force balance theory to predict the void fraction of gas-liquid lead-bismuth two-phase flow in the vertical circular pipe.The distribution of liquid-phase flow velocity,shear stress distribution and void fraction distribution of gas-liquid lead-bismuth two-phase flow at different flow path radii,Bankoff exponents and Galileo numbers are obtained through numerical calculations.The intrinsic relationship between the distribution parameters of the drift flux model and the above macroscopic parameters is analysed.The results show that the predicted void fractions and the evolution of the distribution parameters are in good agreement with the experimental results.The numerical method established in this study can be used to study the flow characteristics of gas-liquid lead-bismuth two-phase flow in a circular tube,and provide reference for the rapid calculation of key two-phase flow parameters such as void fraction in steam generator tube rupture(SGTR)accident of lead-bismuth fast reactor.
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