摘要
Based on Fluent software,the gas−liquid two-phase flow in the horizontal stirred tank was simulated with SST k−ωturbulence model,Eulerian−Eulerian two-fluid model,and multi-reference flame method.The mixing process in the tank was calculated by tracer method.The results show that increasing the rotating speed or gas flow is conducive to a more uniform distribution of the gas phase and accelerates the mixing of the liquid phase.When the rotating speed exceeds 93 r/min,the relative power demand remains basically constant.The change in the inclination angle of the upper impeller has minimal effect on the gas phase distribution.When the inclination angle is 50°,the relative power demand reaches the maximum.An appropriate increase in the impeller distance from the bottom improves the gas holdup and gas phase distribution but increases the liquid phase mixing time.
基于Fluent软件,采用SST k−ω湍流模型、欧拉−欧拉两相流模型和多重参考系法对卧式搅拌釜气液两相流场进行数值模拟,并采用示踪剂法研究釜内混合过程。结果表明:增大转速或气体流量有利于气相分布更均匀并加快液相的混合。当搅拌转速超过93 r/min时,相对功率消耗基本不变。上叶轮倾斜角的变化对气相分布的影响很小。当倾角为50°时,相对功率消耗最大。适当提高桨叶离底高度可以提高气含率并改善气相分布,但会增加液相混匀时间。
基金
financially supported by the Fundamental Research Funds for the Central Universities of Central South University,China(No.2020zzts515)。
