화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Journal of Industrial and Engineering Chemistry, Vol.106, 469-481, February, 2022
DOI10.1016/j.jiec.2021.11.022  Export Citation
Comparison of formation of bubbles and droplets in step-emulsification microfluidic devices
Wei Zhan, Ziwei Liu, Shaokun Jiang1, Chunying Zhu, Youguang Ma, and Taotao Fu†
  • State Key Laboratory of Chemical Engineering, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, PR China
  • 1The 718th Research Institute of CSSC, No. 17, Zhanlan Road, Handan City, Hebei Province 056027, PR China
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Monodispersed microbubbles and microdroplets are widely used as reaction carriers in microfluidics. In this study, the generation processes of bubbles and droplets in a step-emulsification microfluidic device are compared to show the similarities and differences in the emulsification process. By changing the placement of the microdevice, the effects of buoyancy and gravity on the generation of bubbles and droplets are introduced, and the feedback mechanism of the bubble layer and the effect of droplet accumulation on the emulsification process are clarified. Finally, based on the analysis of the difference of the pinch-off of the dispersed phase between the bubble and the droplet in this configuration, the Plateau- Rayleigh instability processes for the formation of bubble and droplet are revealed by using a highspeed camera system, and the reasons for the difference of the operating ranges of the gas flow rate and liquid flow rate in the dripping flow regime are explained.
Keywords:Step-emulsification;Microfluidics;Bubble;Droplet
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