Mass transfer mechanism and relationship of gas–liquid annular flow in a microfluidic cross-junction device

doi:10.1016/j.cjche.2023.06.006

中国化学工程学报 ›› 2023, Vol. 64 ›› Issue (12): 37-48.DOI: 10.1016/j.cjche.2023.06.006

• Full Length Article • 上一篇下一篇

Mass transfer mechanism and relationship of gas–liquid annular flow in a microfluidic cross-junction device

Xin Xu¹, Na Xu^1,2, Wei Zhang¹, Junwen Wang¹, Yao Li¹, Chen Yang¹

1. Shanxi Key Laboratory of Chemical Product Engineering, College of Chemical Engineering and Technology, Taiyuan University of Technology, Taiyuan 030024, China;
2. Shanxi Coking Coal in Yuncheng Salt Refco Group Ltd., Yuncheng 044000, China

收稿日期:2023-03-15 修回日期:2023-05-24 出版日期:2023-12-28 发布日期:2024-02-05
通讯作者: Wei Zhang,E-mail:zhangwei01@tyut.edu.cn;Junwen Wang,E-mail:wangjunwen@tyut.edu.cn
基金资助:
The author would like to acknowledge the financial assistance provided by the National Natural Science Foundation of China (22178241, 21908152 and 21978189) and State Key Laboratory of Chemical Engineering, China (SKL-ChE-21A01).

Mass transfer mechanism and relationship of gas–liquid annular flow in a microfluidic cross-junction device

Xin Xu¹, Na Xu^1,2, Wei Zhang¹, Junwen Wang¹, Yao Li¹, Chen Yang¹

1. Shanxi Key Laboratory of Chemical Product Engineering, College of Chemical Engineering and Technology, Taiyuan University of Technology, Taiyuan 030024, China;
2. Shanxi Coking Coal in Yuncheng Salt Refco Group Ltd., Yuncheng 044000, China

Received:2023-03-15 Revised:2023-05-24 Online:2023-12-28 Published:2024-02-05
Contact: Wei Zhang,E-mail:zhangwei01@tyut.edu.cn;Junwen Wang,E-mail:wangjunwen@tyut.edu.cn
Supported by:
The author would like to acknowledge the financial assistance provided by the National Natural Science Foundation of China (22178241, 21908152 and 21978189) and State Key Laboratory of Chemical Engineering, China (SKL-ChE-21A01).

摘要/Abstract

摘要： Mass transfer performance of gas–liquid two-phase flow at microscale is the basis of application of microreactor in gas–liquid reaction systems. At present, few researches on the mass transfer property of annular flow have been reported. Therefore, the mass transfer mechanism and relationship of gas–liquid annular flow in a microfluidic cross-junction device are studied in the present study. We find that the main factors, i.e., flow pattern, liquid film thickness, liquid hydraulic retention time, phase interface fluctuation, and gas flow vorticity, which influence the flow mass transfer property, are directly affected both by gas and liquid flow velocities. But the influences of gas and liquid velocities on different mass transfer influencing factors are different. Thereout, the fitting relationships between gas and liquid flow velocities and mass transfer influencing factors are established. By comparing the results from calculations using fitting equations and simulations, it shows that the fitting equations have relatively high degrees of accuracy. Finally, the Pareto front, namely the Pareto optimal solution set, of gas and liquid velocity conditions for the best flow mass transfer property is obtained using the method of multi-objective particle swarm optimization. It is proved that the mass transfer property of the gas–liquid two-phase flow can be obviously enhanced under the guidance of the obtained Pareto optimal solution set through experimental verification.

关键词: Gas–liquid microreactor, Annular flow, Mass transfer mechanism, Mass transfer relationship, Multi-objective particle swarm optimization

Abstract: Mass transfer performance of gas–liquid two-phase flow at microscale is the basis of application of microreactor in gas–liquid reaction systems. At present, few researches on the mass transfer property of annular flow have been reported. Therefore, the mass transfer mechanism and relationship of gas–liquid annular flow in a microfluidic cross-junction device are studied in the present study. We find that the main factors, i.e., flow pattern, liquid film thickness, liquid hydraulic retention time, phase interface fluctuation, and gas flow vorticity, which influence the flow mass transfer property, are directly affected both by gas and liquid flow velocities. But the influences of gas and liquid velocities on different mass transfer influencing factors are different. Thereout, the fitting relationships between gas and liquid flow velocities and mass transfer influencing factors are established. By comparing the results from calculations using fitting equations and simulations, it shows that the fitting equations have relatively high degrees of accuracy. Finally, the Pareto front, namely the Pareto optimal solution set, of gas and liquid velocity conditions for the best flow mass transfer property is obtained using the method of multi-objective particle swarm optimization. It is proved that the mass transfer property of the gas–liquid two-phase flow can be obviously enhanced under the guidance of the obtained Pareto optimal solution set through experimental verification.

Key words: Gas–liquid microreactor, Annular flow, Mass transfer mechanism, Mass transfer relationship, Multi-objective particle swarm optimization

Xin Xu, Na Xu, Wei Zhang, Junwen Wang, Yao Li, Chen Yang. Mass transfer mechanism and relationship of gas–liquid annular flow in a microfluidic cross-junction device[J]. 中国化学工程学报, 2023, 64(12): 37-48.

Xin Xu, Na Xu, Wei Zhang, Junwen Wang, Yao Li, Chen Yang. Mass transfer mechanism and relationship of gas–liquid annular flow in a microfluidic cross-junction device[J]. Chinese Journal of Chemical Engineering, 2023, 64(12): 37-48.

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Mass transfer mechanism and relationship of gas–liquid annular flow in a microfluidic cross-junction device

Mass transfer mechanism and relationship of gas–liquid annular flow in a microfluidic cross-junction device

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