Formation and flow characteristics of ordered bubble swarm in a step T-junction microchannel

被引：0
|
作者：
Sheng L. [1 ]
Chang Y. [1 ]
Deng J. [1 ]
Luo G. [1 ]
机构：
[1] State Key Laboratory of Chemical Engineering, Department of Chemical Engineering, Tsinghua University, Beijing
来源：
Huagong Xuebao/CIESC Journal | 2023年 / 74卷 / 01期
关键词：
bubble; crystal; gas-liquid flow; hydrodynamics; microchannels;
D O I：
10.11949/0438-1157.20221014
中图分类号：
学科分类号：
摘要：
The preparation of microbubbles by microfluidic technology has attracted much attention due to its controllable process and wide operating range. In this work, a step T-junction microchannel was chosen as the device for the microbubble generation to study the bubble swarm self-assembly behavior and its flow characteristics. Effects of the liquid volumetric flow rate, liquid viscosity, gas injection pressure, and channel size on the bubble swarm were investigated. The results show that ordered bubble swarm (bubble swarm crystals) can be formed only when the gas phase content in the channel is greater than the liquid phase content, and the bubble swarm crystals can self-assemble into structures with different numbers of rows along the channel width or depth direction in the confined space. Besides, the effects of different operating parameters on the flow behavior of the bubble swarm crystal were explored. The variation rules of the flow velocity of the bubble swarm crystal with the liquid-phase volumetric flow rate are the same as the rules of the gas-liquid two-phase volumetric flow rate. Finally, the strategies to improve the flow ideality of the system are proposed, and a dimensionless model for the prediction of the flow ideality of the bubble swarm crystal is also developed. © 2023 Chemical Industry Press. All rights reserved.
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页码：416 / 427
页数：11
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