Journal of Guangdong University of Technology ›› 2020, Vol. 37 ›› Issue (05): 68-74.doi: 10.12052/gdutxb.200005

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A Research on Numerical Simulation of Droplet Generation in Crossing Microchannels

Luo Jun-wu1, Li Dong-mei2, Liang Shuai2, Wang Shuai-chao2, Xiao Shu-hong1   

  1. 1. School of Electromechanic Engineering, Guangdong University of Technology, Guangzhou 510006, China;
    2. Guangdong Shunde Innovative Design Institute, Foshan 528300, China
  • Received:2019-12-31 Online:2020-09-17 Published:2020-09-17

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Abstract: 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 was 0.01 m/s and 0.02 m/s, the contact angle should be set to 150° and 120° respectively to generate droplets normally.

Key words: crossing type, fluid volume fraction (VOF), numerical simulation, droplet, two-phase flow

CLC Number: 

  • TH776
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