期刊
CHEMICAL ENGINEERING SCIENCE
卷 230, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ces.2020.116190
关键词
Locally constrictive microchannel; Pressure drop analysis; Droplet break-up flow
资金
- National Natural Science Foundation of China [21776150, 21991104]
Locally constrictive microchannels are effective for droplet break-up in microfluidic processes. This study used pressure drop analysis to experimentally investigate droplet break-up flow, confirmed by Fourier transform analysis. The effects of surfactant concentration, fluid flow rate, and viscosity on droplet break-up were studied, along with the additional hydrostatic energy cost for droplet stretching and deformation.
Locally constrictive microchannels are effective components to implement droplet break-up in microfluidic processes. We herein report an experimental study of droplet break-up flow based on pressure drop analysis. The time varying pressure drops were recorded by a self-assembled experimental platform with measurement accuracy of 1 Pa, and the variations of those pressure drops were in accord with the fluctuations of capillary pressure. Fourier transform was then employed to analyze the droplet break-up behaviors and confirm the numbers of daughter droplets instead of traditional microscopic imaging method. With the guidance of the pressure drop analysis, the effects of crucial factors such as surfactant concentration, fluid flow rate, and fluid viscosity on droplet break-up were investigated. The additional hydrostatic energy cost for droplet stretching and deformation in the constriction was finally discussed in contrast to the increase of interfacial energy, which were both confirmed on the level of 10(-8) J/droplet. (C) 2020 Elsevier Ltd. All rights reserved.
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