湿颗粒流化床中双气泡演化过程 CFD-DEM 数值模拟

Bubble is a typical mesoscale structure, and has attracted more and more attention due to its various meso-scale structure evolution. In many industrial processes, bubbles are also important in promoting mixing, heat, and mass transfer rates. In this work, interaction between two bubbles and evolution processes are analyzed from macro, meso scales by numerical simulation. An interesting phenomenon of two bubble interaction and collapsing is found. Two bubbles rise with different growth rate, although two bubble are injected and generated at the same time. This phenomenon agrees with the experimental results (Physical Review Fluids, 2019, 4(3): 034303). The left bubble inhibits and squeezes the right bubble, which results in the right bubble moving upwards faster with a higher bubble shape ratio. With an increase of liquid content, bubble evolution processes are inhibited, and the bubble size, shape and growth rate are reduced and become more irregular.