Isolated mixing regions and mixing enhancement in a high-viscosity laminar stirred tank

doi:10.1016/j.cjche.2021.11.008

Chinese Journal of Chemical Engineering ›› 2022, Vol. 41 ›› Issue (1): 176-192.DOI: 10.1016/j.cjche.2021.11.008

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Isolated mixing regions and mixing enhancement in a high-viscosity laminar stirred tank

Qianqian Kang^1,2, Jinfan Liu⁵, Xin Feng^2,3,4, Chao Yang^2,3, Jingtao Wang¹

1 School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China;
2 Key Laboratory of Green Process and Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China;
3 School of Chemical Engineering, University of Chinese Academy of Sciences, Beijing 100049, China;
4 Innovation Academy for Green Manufacture, Chinese Academy of Sciences, Beijing 100190, China;
5 School of Chemical Engineering, Sichuan University, Chengdu 610065, China

Received:2021-07-28 Revised:2021-11-08 Online:2022-02-25 Published:2022-01-28
Contact: Xin Feng,E-mail address:xfeng@ipe.ac.cn;Jingtao Wang,E-mail address:wjingtao928@tju.edu.cn
Supported by:
Financial supports from National Key Research and Development Program (2020YFA0906804), the National Natural Science Foundation of China (21776282, 21978296 and 22078229), the NSFC Key Program (21938009) and major project (91934301), the National Key R&D Program of China (2019YFC1905805), Chemistry and Chemical Engineering Guangdong Laboratory Shantou (1922006), Innovation Academy for Green Manufacture, Chinese Academy of Sciences (IAGM2020C06) and Youth Innovation Promotion Association CAS are gratefully acknowledged.

Isolated mixing regions and mixing enhancement in a high-viscosity laminar stirred tank

Qianqian Kang^1,2, Jinfan Liu⁵, Xin Feng^2,3,4, Chao Yang^2,3, Jingtao Wang¹

1 School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China;
2 Key Laboratory of Green Process and Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China;
3 School of Chemical Engineering, University of Chinese Academy of Sciences, Beijing 100049, China;
4 Innovation Academy for Green Manufacture, Chinese Academy of Sciences, Beijing 100190, China;
5 School of Chemical Engineering, Sichuan University, Chengdu 610065, China

通讯作者: Xin Feng,E-mail address:xfeng@ipe.ac.cn;Jingtao Wang,E-mail address:wjingtao928@tju.edu.cn
基金资助:
Financial supports from National Key Research and Development Program (2020YFA0906804), the National Natural Science Foundation of China (21776282, 21978296 and 22078229), the NSFC Key Program (21938009) and major project (91934301), the National Key R&D Program of China (2019YFC1905805), Chemistry and Chemical Engineering Guangdong Laboratory Shantou (1922006), Innovation Academy for Green Manufacture, Chinese Academy of Sciences (IAGM2020C06) and Youth Innovation Promotion Association CAS are gratefully acknowledged.

Abstract

Abstract: Laminar mixing in the stirred tank is widely encountered in chemical and biological industries. Isolated mixing regions (IMRs) usually exist when the fluid medium has high viscosity, which are not conducive to mixing. In this work, the researches on IMRs, enhancement of laminar mixing and the phenomenon of particle clustering within IMRs are reviewed. For most studies, the aim is to destroy IMRs and improve the chaotic mixing. To this end, the mechanism of chaotic mixing and the structure of IMRs were well investigated. The methods developed to destroy IMRs include off-centered agitation, dynamic mixing protocol, special designs of impellers, baffles, etc. In addition, the methods to characterize the shape and size of IMRs as well as mixing effect by experiments and simulations are summarized. However, IMRs are not always nuisance, and it may be necessary in some situations. Finally, the present engineering applications are summarized, and the prospect of the future application is predicted. For example, particle clustering will form in the co-existing system of chaotic mixing and IMRs, which can be used for solid–liquid separation and recovery of particles from high viscosity fluid.

Key words: Laminar mixing, Stirred tank, Isolated mixing regions, Particle clustering, Solid-liquid separation

摘要： Laminar mixing in the stirred tank is widely encountered in chemical and biological industries. Isolated mixing regions (IMRs) usually exist when the fluid medium has high viscosity, which are not conducive to mixing. In this work, the researches on IMRs, enhancement of laminar mixing and the phenomenon of particle clustering within IMRs are reviewed. For most studies, the aim is to destroy IMRs and improve the chaotic mixing. To this end, the mechanism of chaotic mixing and the structure of IMRs were well investigated. The methods developed to destroy IMRs include off-centered agitation, dynamic mixing protocol, special designs of impellers, baffles, etc. In addition, the methods to characterize the shape and size of IMRs as well as mixing effect by experiments and simulations are summarized. However, IMRs are not always nuisance, and it may be necessary in some situations. Finally, the present engineering applications are summarized, and the prospect of the future application is predicted. For example, particle clustering will form in the co-existing system of chaotic mixing and IMRs, which can be used for solid–liquid separation and recovery of particles from high viscosity fluid.

关键词: Laminar mixing, Stirred tank, Isolated mixing regions, Particle clustering, Solid-liquid separation

Qianqian Kang, Jinfan Liu, Xin Feng, Chao Yang, Jingtao Wang. Isolated mixing regions and mixing enhancement in a high-viscosity laminar stirred tank[J]. Chinese Journal of Chemical Engineering, 2022, 41(1): 176-192.

Qianqian Kang, Jinfan Liu, Xin Feng, Chao Yang, Jingtao Wang. Isolated mixing regions and mixing enhancement in a high-viscosity laminar stirred tank[J]. 中国化学工程学报, 2022, 41(1): 176-192.

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Isolated mixing regions and mixing enhancement in a high-viscosity laminar stirred tank

Isolated mixing regions and mixing enhancement in a high-viscosity laminar stirred tank

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