Mass transfer intensification and mechanism analysis of gas–liquid two-phase flow in the microchannel embedding triangular obstacles

doi:10.1016/j.cjche.2021.09.016

中国化学工程学报 ›› 2022, Vol. 51 ›› Issue (11): 100-108.DOI: 10.1016/j.cjche.2021.09.016

• Full Length Article • 上一篇下一篇

Mass transfer intensification and mechanism analysis of gas–liquid two-phase flow in the microchannel embedding triangular obstacles

Xuanyu Nie, Chunying Zhu, Taotao Fu, Youguang Ma

State Key Laboratory of Chemical Engineering, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China

收稿日期:2021-07-23 修回日期:2021-09-25 出版日期:2022-11-18 发布日期:2023-01-18
通讯作者: Chunying Zhu,E-mail:zhchy971@tju.edu.cn;Youguang Ma,E-mail:ygma@tju.edu.cn
基金资助:
This work was supported by the financial supports from the National Natural Science Foundation of China (21776200, 92034303, and 21978197), and thanks the Program of Introducing Talents of Discipline to Universities (BP0618007).

Mass transfer intensification and mechanism analysis of gas–liquid two-phase flow in the microchannel embedding triangular obstacles

Xuanyu Nie, Chunying Zhu, Taotao Fu, Youguang Ma

State Key Laboratory of Chemical Engineering, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China

Received:2021-07-23 Revised:2021-09-25 Online:2022-11-18 Published:2023-01-18
Contact: Chunying Zhu,E-mail:zhchy971@tju.edu.cn;Youguang Ma,E-mail:ygma@tju.edu.cn
Supported by:
This work was supported by the financial supports from the National Natural Science Foundation of China (21776200, 92034303, and 21978197), and thanks the Program of Introducing Talents of Discipline to Universities (BP0618007).

摘要/Abstract

摘要： An effective mass transfer intensification method was proposed by embedding different triangular obstacles to improve the gas–liquid mass transfer efficiency in microchannel. The influences of triangle obstacles configuration, obstacle interval and flow rate on the volumetric mass transfer coefficient, pressure drop and energy consumption were investigated experimentally. The enhancement factor was used to quantify the mass transfer enhancement effect of triangle obstacles. It was found that the isosceles or equilateral triangle obstacles are superior to the rectangular obstacles. The maximum enhancement factor of equilateral triangle obstacles was 2.35. Considering comprehensively mass transfer enhancement and energy consumption, the isosceles triangle obstacle showed the best performance, its maximum enhancement factor was 2.1, while the maximum pressure drop increased only 0.41 kPa (22%) compared to the microchannel without obstacles. Furthermore, a micro-particle image velocimetry (micro-PIV) was utilized to observe the flow field distribution and evolution, in order to understand and analyze the enhancement mechanism. The micro-PIV measurement indicated that the obstacle structure could induce the formation of vortex, which promotes convective mass transfer and thins the flow boundary layer, accordingly, the gas–liquid mass transfer efficiency is remarkably improved. This study can provide theoretical guidance and support for the design and optimization of microchannel with triangular obstacles.

关键词: Enhancement factor, Microchannels, Gas–liquid flow, Mass transfer, Triangular obstacle

Abstract: An effective mass transfer intensification method was proposed by embedding different triangular obstacles to improve the gas–liquid mass transfer efficiency in microchannel. The influences of triangle obstacles configuration, obstacle interval and flow rate on the volumetric mass transfer coefficient, pressure drop and energy consumption were investigated experimentally. The enhancement factor was used to quantify the mass transfer enhancement effect of triangle obstacles. It was found that the isosceles or equilateral triangle obstacles are superior to the rectangular obstacles. The maximum enhancement factor of equilateral triangle obstacles was 2.35. Considering comprehensively mass transfer enhancement and energy consumption, the isosceles triangle obstacle showed the best performance, its maximum enhancement factor was 2.1, while the maximum pressure drop increased only 0.41 kPa (22%) compared to the microchannel without obstacles. Furthermore, a micro-particle image velocimetry (micro-PIV) was utilized to observe the flow field distribution and evolution, in order to understand and analyze the enhancement mechanism. The micro-PIV measurement indicated that the obstacle structure could induce the formation of vortex, which promotes convective mass transfer and thins the flow boundary layer, accordingly, the gas–liquid mass transfer efficiency is remarkably improved. This study can provide theoretical guidance and support for the design and optimization of microchannel with triangular obstacles.

Key words: Enhancement factor, Microchannels, Gas–liquid flow, Mass transfer, Triangular obstacle

Xuanyu Nie, Chunying Zhu, Taotao Fu, Youguang Ma. Mass transfer intensification and mechanism analysis of gas–liquid two-phase flow in the microchannel embedding triangular obstacles[J]. 中国化学工程学报, 2022, 51(11): 100-108.

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Mass transfer intensification and mechanism analysis of gas–liquid two-phase flow in the microchannel embedding triangular obstacles

Mass transfer intensification and mechanism analysis of gas–liquid two-phase flow in the microchannel embedding triangular obstacles

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