Numerical simulation of bubble rising behavior in liquid LBE using diffuse interface method

摘要

In this paper, a novel numerical simulation method named diffuse interface method is used to simulate the interfacial dynamics of a single nitrogen bubble rising in liquid lead-bismuth eutectic (LBE). A single nitrogen bubble in liquid LBE from static to the full development of dynamic behavior was simulated to get the relationship of rising velocity and deformation of the bubble by time. The numerical results of the flow characteristics are consistent with the Grace's empirical correlation graph, which preliminarily demonstrates the feasibility and the accuracy of diffuse interface method on simulation of rising bubble's behavior in liquid LBE. It can be found from more simulations that the smaller bubble initial diameter is, the disturbance will be more intense in the rising process and splitting phenomenon occurs more easily in the rising process when the bubble initial diameter is larger.