Abstract:In order to explore the influence of bubble size on numerical simulation of gas-liquid two-phase flow in aeration tanks, a mathematical model for two-phase flow in aeration tanks was established using large-eddy simulation and Eulerian-Lagrangian approach. Based on the measured bubble size distribution produced by a commonly used membrane diffuser in model experiments, three kinds of bubble size set schemes in numerical simulation were designed. The effect of the different set schemes on the calculation of the flow velocity and gas holdup was studied. Bubble size had a great influence on the flow field in aeration tanks, and had little effect on the gas holdup distribution in most regions except the vicinity of the gas holdup peak; the input of bubble size using multiple size groups instead of a single group improved the prediction of two-phase flow in aeration tanks; when single bubble size was used, it should be as close to the average bubble diameter as possible.
肖柏青, 张法星, 戎贵文. 气泡尺寸对曝气池内气液两相流数值模拟的影响[J]. 中国环境科学, 2012, 32(11): 2006-2010.
XIAO Bai-Qing, ZHANG Fa-Xing, RONG Gui-Wen. Influence of the bubble size on numerical simulation of the gas-liquid flow in aeration tanks. CHINA ENVIRONMENTAL SCIENCECE, 2012, 32(11): 2006-2010.