CFD and experimental investigations on the micromixing performance of single countercurrent-flow microchannel reactor

doi:10.1016/j.cjche.2018.11.026

中国化学工程学报 ›› 2019, Vol. 27 ›› Issue (5): 1079-1088.DOI: 10.1016/j.cjche.2018.11.026

CFD and experimental investigations on the micromixing performance of single countercurrent-flow microchannel reactor

Kunpeng Cheng¹, Chunyu Liu¹, Tianyu Guo¹, Lixiong Wen^1,2

1 State Key Laboratory of Organic-Inorganic Composites, Beijing University of Chemical Technology, Beijing 100029, China;
2 Research Center of the Ministry of Education for High Gravity Engineering and Technology, Beijing University of Chemical Technology, Beijing 100029, China

收稿日期:2018-07-18 修回日期:2018-11-23 出版日期:2019-05-28 发布日期:2019-06-27
通讯作者: Lixiong Wen
基金资助:
Supported by the National Natural Science Foundation of China (21576012) and the National Key Research and Development Program of China (2017YFB0307202).

CFD and experimental investigations on the micromixing performance of single countercurrent-flow microchannel reactor

Kunpeng Cheng¹, Chunyu Liu¹, Tianyu Guo¹, Lixiong Wen^1,2

1 State Key Laboratory of Organic-Inorganic Composites, Beijing University of Chemical Technology, Beijing 100029, China;
2 Research Center of the Ministry of Education for High Gravity Engineering and Technology, Beijing University of Chemical Technology, Beijing 100029, China

Received:2018-07-18 Revised:2018-11-23 Online:2019-05-28 Published:2019-06-27
Contact: Lixiong Wen
Supported by:
Supported by the National Natural Science Foundation of China (21576012) and the National Key Research and Development Program of China (2017YFB0307202).

摘要/Abstract

摘要： Microchannel reactors are widely used in different fields due to their intensive micromixing and, thus, high masstransfer efficiency. In this work, a single countercurrent-flow microchannel reactor (S-CFMCR) at the size of~1 mm was developed by steel micro-capillary and laser drilling technology. Utilizing the Villermaux/Dushman parallel competing reaction, numerical and experimental studies were carried out to investigate the micromixing performance (expressed as the segregation index X_S) of liquids inside S-CFMCR at the low flow velocity regime. The effects of various operating conditions and design parameters of S-CFMCR, e.g., inlet Reynolds number (Re), volumetric flow ratio (R), inlet diameter (d) and outlet length (L), on the quality of micromixing were studied qualitatively. It was found that the micromixing efficiency was enhanced with increasing Re, but weakened with the increase of R. Moreover, d and L also have a significant influence on micromixing. CFD results were in good agreement with experimental data. In addition, the visualization of velocity magnitude, turbulent kinetic energy and concentration distributions of various ions inside S-CFMCR was illustrated as well. Based on the incorporation model, the estimated minimum micromixing time t_m of S-CFMCR is~2×10^-4 s.

关键词: Single countercurrent-flow microchannel reactor, Micromixing performance, CFD, Villermaux/Dushman reaction

Abstract: Microchannel reactors are widely used in different fields due to their intensive micromixing and, thus, high masstransfer efficiency. In this work, a single countercurrent-flow microchannel reactor (S-CFMCR) at the size of~1 mm was developed by steel micro-capillary and laser drilling technology. Utilizing the Villermaux/Dushman parallel competing reaction, numerical and experimental studies were carried out to investigate the micromixing performance (expressed as the segregation index X_S) of liquids inside S-CFMCR at the low flow velocity regime. The effects of various operating conditions and design parameters of S-CFMCR, e.g., inlet Reynolds number (Re), volumetric flow ratio (R), inlet diameter (d) and outlet length (L), on the quality of micromixing were studied qualitatively. It was found that the micromixing efficiency was enhanced with increasing Re, but weakened with the increase of R. Moreover, d and L also have a significant influence on micromixing. CFD results were in good agreement with experimental data. In addition, the visualization of velocity magnitude, turbulent kinetic energy and concentration distributions of various ions inside S-CFMCR was illustrated as well. Based on the incorporation model, the estimated minimum micromixing time t_m of S-CFMCR is~2×10^-4 s.

Key words: Single countercurrent-flow microchannel reactor, Micromixing performance, CFD, Villermaux/Dushman reaction

Kunpeng Cheng, Chunyu Liu, Tianyu Guo, Lixiong Wen. CFD and experimental investigations on the micromixing performance of single countercurrent-flow microchannel reactor[J]. 中国化学工程学报, 2019, 27(5): 1079-1088.

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CFD and experimental investigations on the micromixing performance of single countercurrent-flow microchannel reactor

CFD and experimental investigations on the micromixing performance of single countercurrent-flow microchannel reactor

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