Experimental investigation of droplet formation in coaxial microchannels with different geometries of inner channel

被引：0
作者：
Song S. [1 ,2 ]
Liu H. [1 ]
Mi X. [1 ]
Xu C. [2 ]
Yang M. [2 ]
Yao C. [2 ]
机构：
[1] School of Environmental and Chemical Engineering, Xi’an Polytechnic University, Shaanxi, Xi’an
[2] Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Liaoning, Dalian
来源：
Huagong Xuebao/CIESC Journal | 2024年 / 75卷 / 02期
关键词：
droplet formation; flow regimes; inner channel geometry; microchannels; two-phase flow;
D O I：
10.11949/0438-1157.20231245
中图分类号：
学科分类号：
摘要：
The droplet generation process of the water-silicone oil system in the coaxial microchannel was studied. Under different continuous capillary number Cac and dispersed phase Weber number Wed, two different flow patterns, dripping flow and jet flow, were observed. Experiments examined the effects of two-phase flow, viscosity, and inner tube structure on droplet size and droplet generation frequency. The results showed that droplet size increased with the increase of dispersed phase flow rate and decrease of flow rate and viscosity of continuous phase. Additionally, with the increase of Wed, jetting occurrence was found to be easier in relatively larger capillary, which in turn generated larger droplets. The generation frequency of droplet increased fast firstly then slow down to a plateau with the increasing of Cacand Wed. When the hydraulic diameters of inner channel were almost same, the deviation in the generation frequency of droplet obtained from different geometries of inner channel was small at fixed Cac. And the generation frequency of droplet increased with the decrease in the hydraulic diameters of inner channel. Based on the obtained results, an empirical correlation was proposed to predict the droplet size with good prediction performance. © 2024 Materials China. All rights reserved.
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页码：566 / 574
页数：8
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