CFD simulation of flow and mixing characteristics in a stirred tank agitated by improved disc turbines

doi:10.1016/j.cjche.2022.05.017

中国化学工程学报 ›› 2022, Vol. 50 ›› Issue (10): 95-107.DOI: 10.1016/j.cjche.2022.05.017

• Fluid Dynamics and Transport Phenomena • 上一篇下一篇

CFD simulation of flow and mixing characteristics in a stirred tank agitated by improved disc turbines

Zhuotai Jia^1,2, Lele Xu³, Xiaoxia Duan¹, Zai-Sha Mao¹, Qinghua Zhang^1,2, 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;
3 School of Chemical Engineering, Nanjing Tech University, Nanjing 211816, China

收稿日期:2022-02-14 修回日期:2022-05-13 出版日期:2022-10-28 发布日期:2023-01-04
通讯作者: Qinghua Zhang,E-mail:qhzhang@ipe.ac.cn;Chao Yang,E-mail:chaoyang@ipe.ac.cn
基金资助:
This work is supported by the National Key Research and Development Program (2020YFA0906800), the National Natural Science Foundation of China (22078325, 21938009), the NSFC-EU project (31961133018), the Special Project of Strategic Leading Science and Technology CAS (XDC06010302), Chemistry and Chemical Engineering Guangdong Laboratory, Shantou (No. 1922006) and the Li Foundation Fellow Program.

CFD simulation of flow and mixing characteristics in a stirred tank agitated by improved disc turbines

Zhuotai Jia^1,2, Lele Xu³, Xiaoxia Duan¹, Zai-Sha Mao¹, Qinghua Zhang^1,2, 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;
3 School of Chemical Engineering, Nanjing Tech University, Nanjing 211816, China

Received:2022-02-14 Revised:2022-05-13 Online:2022-10-28 Published:2023-01-04
Contact: Qinghua Zhang,E-mail:qhzhang@ipe.ac.cn;Chao Yang,E-mail:chaoyang@ipe.ac.cn
Supported by:
This work is supported by the National Key Research and Development Program (2020YFA0906800), the National Natural Science Foundation of China (22078325, 21938009), the NSFC-EU project (31961133018), the Special Project of Strategic Leading Science and Technology CAS (XDC06010302), Chemistry and Chemical Engineering Guangdong Laboratory, Shantou (No. 1922006) and the Li Foundation Fellow Program.

摘要/Abstract

摘要： To reduce the power consumption and improve the mixing performance in stirred tanks, two improved disc turbines namely swept-back parabolic disc turbine (SPDT) and staggered fan-shaped parabolic disc turbine (SFPDT) are developed. After validation of computational fluid dynamics (CFD) model with experimental results, CFD simulations are carried out to study the flow pattern, mean velocity, power consumption, pumping capacity and mixing efficiency of the improved and traditional impellers in a dished-bottom tank under turbulent flow conditions. The results indicate that compared with the commonly used parabolic disc turbine (PDT), the power number of proposed SPDT and SFPDT impellers is reduced by 43% and 12%, and the pumping efficiency is increased by 68% and 13%, respectively. Furthermore, under the same power consumption (0-700 W·m^-3), the mixing performance of both SPDT and SFPDT is also superior to that of Rushton turbine and PDT.

关键词: Flow regime, Mixing time, Stirred vessel, Computational fluid dynamics, Improved disc turbine

Abstract: To reduce the power consumption and improve the mixing performance in stirred tanks, two improved disc turbines namely swept-back parabolic disc turbine (SPDT) and staggered fan-shaped parabolic disc turbine (SFPDT) are developed. After validation of computational fluid dynamics (CFD) model with experimental results, CFD simulations are carried out to study the flow pattern, mean velocity, power consumption, pumping capacity and mixing efficiency of the improved and traditional impellers in a dished-bottom tank under turbulent flow conditions. The results indicate that compared with the commonly used parabolic disc turbine (PDT), the power number of proposed SPDT and SFPDT impellers is reduced by 43% and 12%, and the pumping efficiency is increased by 68% and 13%, respectively. Furthermore, under the same power consumption (0-700 W·m^-3), the mixing performance of both SPDT and SFPDT is also superior to that of Rushton turbine and PDT.

Key words: Flow regime, Mixing time, Stirred vessel, Computational fluid dynamics, Improved disc turbine

Zhuotai Jia, Lele Xu, Xiaoxia Duan, Zai-Sha Mao, Qinghua Zhang, Chao Yang. CFD simulation of flow and mixing characteristics in a stirred tank agitated by improved disc turbines[J]. 中国化学工程学报, 2022, 50(10): 95-107.

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CFD simulation of flow and mixing characteristics in a stirred tank agitated by improved disc turbines

CFD simulation of flow and mixing characteristics in a stirred tank agitated by improved disc turbines

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