Effect of impeller type and scale-up on spatial distribution of shear rate in a stirred tank

doi:10.1016/j.cjche.2021.03.004

Chinese Journal of Chemical Engineering ›› 2022, Vol. 42 ›› Issue (2): 351-363.DOI: 10.1016/j.cjche.2021.03.004

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Effect of impeller type and scale-up on spatial distribution of shear rate in a stirred tank

Huina Wang^1,2, Xiaoxia Duan^1,2, Xin Feng^1,2, Zai-Sha Mao¹, Chao Yang^1,2

1. CAS Key Laboratory of Green Process and Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China;
2. School of Chemical Engineering, University of Chinese Academy of Sciences, Beijing 100049, China

Received:2021-01-07 Revised:2021-03-01 Online:2022-03-30 Published:2022-02-28
Contact: Xiaoxia Duan,E-mail:xxduan@ipe.ac.cn;Chao Yang,E-mail:chaoyang@ipe.ac.cn
Supported by:
Financial support from National Key Research and Development Program (2020YFA0906800), the National Natural Science Foundation of China (21808221, 91934301, 21961160745), External Cooperation Program of BIC, Chinese Academy of Sciences (122111KYSB20190032), the Key Research Program of Nanjing IPE Institute of Green Manufacturing Industry (No. E0010719), and Innovation Academy for Green Manufacture, Chinese Academy of Sciences (IAGM2020C06) is gratefully acknowledged.

Effect of impeller type and scale-up on spatial distribution of shear rate in a stirred tank

Huina Wang^1,2, Xiaoxia Duan^1,2, Xin Feng^1,2, Zai-Sha Mao¹, Chao Yang^1,2

1. CAS Key Laboratory of Green Process and Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China;
2. School of Chemical Engineering, University of Chinese Academy of Sciences, Beijing 100049, China

通讯作者: Xiaoxia Duan,E-mail:xxduan@ipe.ac.cn;Chao Yang,E-mail:chaoyang@ipe.ac.cn
基金资助:
Financial support from National Key Research and Development Program (2020YFA0906800), the National Natural Science Foundation of China (21808221, 91934301, 21961160745), External Cooperation Program of BIC, Chinese Academy of Sciences (122111KYSB20190032), the Key Research Program of Nanjing IPE Institute of Green Manufacturing Industry (No. E0010719), and Innovation Academy for Green Manufacture, Chinese Academy of Sciences (IAGM2020C06) is gratefully acknowledged.

Abstract

Abstract: The main spatial distribution features of shear rate in a stirred tank operated with five different radial and axial flow impellers were presented with particle image velocimetry (PIV) experiments. Not only the average shear rate in the whole tank but also the local value in the vicinity of impeller increases linearly with impeller speed. Furthermore, the shear coefficient (K_s,imp) at the impeller outlet is linearly related to the impeller flow number (N_q) and decreases with the increase of N_q in general at the constant power consumption per unit volume (P_v). During scale-up based on the constant P_v and geometric similarity, CFD results show that the volume-averaged shear rate (γ_avg) for RDT decreases faster than that of other impellers with the impeller tip velocity (U_tip). The novel multi-blade combined (MBC) impeller with the increased height-to-diameter ratio of the stirred tank is able to more effectively improve the distribution uniformity of shear rate at the same P_v after scale-up. These studies provide a data basis for selecting the impeller types and improving the shear rate environment in the large-scale stirred tank.

Key words: Particle image velocimetry, Shear rate distribution, Constant power consumption per unit volume, Computational fluid dynamics, Scale-up

摘要： The main spatial distribution features of shear rate in a stirred tank operated with five different radial and axial flow impellers were presented with particle image velocimetry (PIV) experiments. Not only the average shear rate in the whole tank but also the local value in the vicinity of impeller increases linearly with impeller speed. Furthermore, the shear coefficient (K_s,imp) at the impeller outlet is linearly related to the impeller flow number (N_q) and decreases with the increase of N_q in general at the constant power consumption per unit volume (P_v). During scale-up based on the constant P_v and geometric similarity, CFD results show that the volume-averaged shear rate (γ_avg) for RDT decreases faster than that of other impellers with the impeller tip velocity (U_tip). The novel multi-blade combined (MBC) impeller with the increased height-to-diameter ratio of the stirred tank is able to more effectively improve the distribution uniformity of shear rate at the same P_v after scale-up. These studies provide a data basis for selecting the impeller types and improving the shear rate environment in the large-scale stirred tank.

关键词: Particle image velocimetry, Shear rate distribution, Constant power consumption per unit volume, Computational fluid dynamics, Scale-up

Huina Wang, Xiaoxia Duan, Xin Feng, Zai-Sha Mao, Chao Yang. Effect of impeller type and scale-up on spatial distribution of shear rate in a stirred tank[J]. Chinese Journal of Chemical Engineering, 2022, 42(2): 351-363.

Huina Wang, Xiaoxia Duan, Xin Feng, Zai-Sha Mao, Chao Yang. Effect of impeller type and scale-up on spatial distribution of shear rate in a stirred tank[J]. 中国化学工程学报, 2022, 42(2): 351-363.

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Effect of impeller type and scale-up on spatial distribution of shear rate in a stirred tank

Effect of impeller type and scale-up on spatial distribution of shear rate in a stirred tank

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