十字交叉型微通道内液滴形成的数值模拟研究  

A Research on Numerical Simulation of Droplet Generation in Crossing Microchannels

作　　者：罗钧午 李冬梅 梁帅 王帅超 肖曙红[1] Luo Jun-wu;Li Dong-mei;Liang Shuai;Wang Shuai-chao;Xiao Shu-hong(School of Electromechanic Engineering,Guangdong University of Technology,Guangzhou 510006,China;Guangdong Shunde Innovative Design Institute,Foshan 528300,China)

机构地区：[1]广东工业大学机电工程学院,广东广州510006 [2]广东顺德创新设计研究院,广东佛山528300

出　　处：《广东工业大学学报》2020年第5期68-74,共7页Journal of Guangdong University of Technology

基　　金：国家自然科学基金资助项目(50975051)。

摘　　要：基于Fluent软件的流体体积分数(Fluid Volume Fraction,VOF)模型,针对十字交叉型微通道内液滴的形成过程开展了三维数值模拟研究,分别研究了连续相黏度、分散相黏度、两相界面张力系数、壁面接触角对液滴形成的影响,为实际应用提供参考。研究表明随着连续相流速的增加,液滴生成直径减少,生成频率增大;增加连续相黏度时,液滴生成直径变小,生成频率的变化则相反;当分散相黏度超过连续相黏度时,出现射流现象而不能生成液滴;液滴生成直径随两相界面张力系数的增加而增大,生成频率降低;增大壁面接触角有利于液滴的产生,且两相流速为0.01m/s和0.02 m/s时,接触角应分别取到150°和120°才能正常生成液滴。Based on the fluid volume fraction(VOF)model of Fluent software,the droplet generation process in crossing microchannel was investigated by three-dimensional numerical simulation study,and the influences of continuous phase viscosity,dispersed phase viscosity,two-phase interfacial tension and wall contact angle on droplet generation were researched respectively,providing reference for practical applications.The simulation results showed that the droplet size decreased and the generation frequency increased with the increasing flow velocity of continuous phase.When the continuous phase viscosity was increased,the droplet size would decrease and the generation frequency change was opposite.If the dispersed phase viscosity exceeded the continuous phase viscosity,the jet flow phenomenon would occur and the droplets could not be generated.With the increase of the interfacial tension coefficient of two phases,the droplet size would increase,and the formation frequency would decrease.Increasing wall contact angle is beneficial to droplet generation,and when the two-phase flow rate was0.01 m/s and 0.02 m/s,the contact angle should be set to 150°and 120°respectively to generate droplets normally.

关 键 词：十字交叉型 流体体积分数(VOF) 数值模拟 液滴 两相流 

分 类 号：TH776[机械工程—仪器科学与技术]