规整填料内高密度差液液两相流动模拟  

Simulation of High Density Differential Liquid-Liquid Two-Phase Flow in Structured Packing

作　　者：郭方圆 王丽军[1] 成有为[1] 李希[1] GUO Fangyuan;WANG Lijun;CHENG Youwei;LI Xi(College of Chemical and Biological Engineering,Zhejiang University,Hangzhou 310027,China)

机构地区：[1]浙江大学化学工程与生物工程学院,浙江杭州310027

出　　处：《化学反应工程与工艺》2020年第2期97-107,共11页Chemical Reaction Engineering and Technology

摘　　要：萃取塔内填料的构型决定了传质效能,使用计算流体力学(Computation Fluid Dynamics,CFD)中的VOF(VolumeofFluid)模型模拟两种不同构型规整填料内高密度差液液两相流动过程,获得填料塔内的液滴运动三维图像,考察液滴的破碎和聚并过程。模拟结果表明,斜流波纹板填料中破碎与聚并作用同时存在,液滴尺寸较小,但分散相液滴的运动速度较快,停留时间短。水平波纹板填料内液滴发生一定程度的聚并,形成较大尺寸液滴,分散相液滴的运动速度较慢,具有较长的停留时间。结合两种填料板的特点,将斜流波纹板和水平波纹板交替放置形成新构型填料,新填料具有较长的平均停留时间和较小的液滴尺寸,与斜流波纹板和水平波纹板填料相比,具有更高的有效相界面积比。The configuration of the packing in the extraction column determines the mass transfer efficiency,and the volume of fluid(VOF)model of the computational fluid dynamics(CFD)method was used to simulate the two-phase flow of liquids with high density difference in structured packings with different configurations.A 3 D image of droplet movement in the packed column was obtained,and the process of droplet breakup and coalescence was examined.The simulation results showed that the breakup and coalescence in the diagonal corrugated packing existed simultaneously,which resulted in smaller droplet size.However,the dispersion phase droplets in the diagonal corrugated packing moved faster and the residence time was smaller.The droplets in the horizontal corrugated packing were aggregated to some extent to form lager-sized droplets,and the moving speed of the dispersed phase droplets was slower,with a longer residence time.Combined with the characteristics of two packings,the diagonal corrugated packing and the horizontal corrugated packing were alternately placed to form a new packing,the new packing had a large average residence time and a small droplet size.Compared with the diagonal corrugated packing and the horizontal corrugated packing,the new packing had a higher two-phase effective interfacial area ratio.

关 键 词：计算流体力学 两相流动 斜流波纹板填料 水平波纹板填料 新构型填料 有效相界面积比 

分 类 号：TQ028[化学工程]