化工学报2024，Vol.75Issue(5)：1816-1829,14.DOI:10.11949/0438-1157.20231244
基于PBM的离心式叶轮内气泡破碎合并数值模拟
Numerical simulation of bubble breakup and coalescence in centrifugal impeller based on PBM
摘要
Abstract
In addressing the issue of larger and unevenly distributed bubble sizes within the impeller during the preparation of microbubbles using a centrifugal pump,this study investigates the impact of different inlet gas volume fraction(IGVF)and rotational speeds on the diameter and distribution of bubbles within the impeller.The Euler-Euler non-uniform two-fluid model is coupled with the population balance model(PBM)to solve the rotating two-phase flow field within the impeller of the centrifugal pump.Additionally,vortex identification methods and the Luo fragmentation and coalescence model are employed to analyze the distribution patterns of bubbles within the impeller.The results indicate the following:① Vortices near the leading edge and the suction side of the blades cause gas accumulation,causing the local gas content in the flow channel to increase,where the bubble merger effect dominates.② When the flow rate and rotational speed are constant,as the IGVF increases,the turbulence intensity in the flow channel increases,and the vortex moves backward,causing the gas phase accumulation area to also extend backward.The region of high local gas content on the suction surface significantly surpasses that on the pressure surface.Consequently,the bubble merging behavior on the suction surface becomes more pronounced,resulting in larger bubble diameters.③ When the IGVF and flow rate are constant,increasing the rotation speed in a small range can enhance the bubble crushing effect and obtain smaller diameter bubbles.关键词
气液两相流/计算流体力学/群体平衡模型/微气泡/粒度分布Key words
gas-liquid flow/computational fluid dynamics/population balance model/micro bubbles/size distribution分类
化学化工引用本文复制引用
师毓辉,邢继远,姜雪晗,叶爽,黄伟光..基于PBM的离心式叶轮内气泡破碎合并数值模拟[J].化工学报,2024,75(5):1816-1829,14.基金项目
国家重点研发计划项目"政府间国际科技创新合作"(2019YFE0122100) （2019YFE0122100）
