CFD simulation of hydrodynamics and mixing performance in dual shaft eccentric mixers

doi:10.1016/j.cjche.2023.03.004

中国化学工程学报 ›› 2023, Vol. 62 ›› Issue (10): 297-309.DOI: 10.1016/j.cjche.2023.03.004

• Full Length Article • 上一篇下一篇

CFD simulation of hydrodynamics and mixing performance in dual shaft eccentric mixers

Songsong Wang^1,2, Xia Xiong^1,2, Peiqiao Liu¹, Qiongzhi Zhang³, Qian Zhang¹, Changyuan Tao^1,2, Yundong Wang⁴, Zuohua Liu^1,2

1. School of Chemistry and Chemical Engineering, Chongqing University, Chongqing 400044, China;
2. State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing 400044, China;
3. School of Mechanical and Transportation Engineering, Chongqing University, Chongqing 400044, China;
4. Department of Chemical Engineering, Tsinghua University, Beijing 100084, China

收稿日期:2023-01-15 修回日期:2023-02-28 出版日期:2023-10-28 发布日期:2023-12-23
通讯作者: Zuohua Liu,E-mail:liuzuohua@cqu.edu.cn
基金资助:
This work was supported by the National Natural Science Foundation of China (22078030, 52021004), National Natural Science Foundation of Chongqing (2022NSCQ-LZX0271), Fundamental Research Funds for the Central Universities (2022CDJQY-005), National Key Research and Development Project (2019YFC1905802, 2022YFC3901204), Key Project of Independent Research Project of State Key Laboratory of coal mine disaster dynamics and control (2011DA105287-zd201902).

CFD simulation of hydrodynamics and mixing performance in dual shaft eccentric mixers

Songsong Wang^1,2, Xia Xiong^1,2, Peiqiao Liu¹, Qiongzhi Zhang³, Qian Zhang¹, Changyuan Tao^1,2, Yundong Wang⁴, Zuohua Liu^1,2

1. School of Chemistry and Chemical Engineering, Chongqing University, Chongqing 400044, China;
2. State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing 400044, China;
3. School of Mechanical and Transportation Engineering, Chongqing University, Chongqing 400044, China;
4. Department of Chemical Engineering, Tsinghua University, Beijing 100084, China

Received:2023-01-15 Revised:2023-02-28 Online:2023-10-28 Published:2023-12-23
Contact: Zuohua Liu,E-mail:liuzuohua@cqu.edu.cn
Supported by:
This work was supported by the National Natural Science Foundation of China (22078030, 52021004), National Natural Science Foundation of Chongqing (2022NSCQ-LZX0271), Fundamental Research Funds for the Central Universities (2022CDJQY-005), National Key Research and Development Project (2019YFC1905802, 2022YFC3901204), Key Project of Independent Research Project of State Key Laboratory of coal mine disaster dynamics and control (2011DA105287-zd201902).

摘要/Abstract

摘要： This work aims to systematically study hydrodynamics and mixing characteristics of non-Newtonian fluid (carboxyl methyl cellulose, CMC) in dual shaft eccentric mixer. Fluid rheology was described by the power law rheological model. Computational fluid dynamics was employed to simulate the velocity field and shear rate inside the stirred tank. The influence mechanism of the rotational modes, height difference between impellers, impeller eccentricities, and impeller types on the flow field have been well investigated. We studied the performance of different dual-shaft eccentric mixers at the constant power input with its fluid velocity profiles, average shear strain rate, mixing time and mixing energy. The counter-rotation mode shows better mixing performance than co-rotation mode, and greater eccentricity can shorten mixing time on the basis of same stirred condition. To intensify the hydrodynamic interaction between impellers and enhance the overall mixing performance of the dual shaft eccentric mixers, it is critical to have a reasonable combination of impellers and an appropriate spatial position of impellers.

关键词: Dual shaft eccentric mixers, Non-Newtonian fluid, Mixing, Laminar flow, Computational fluid dynamics

Abstract: This work aims to systematically study hydrodynamics and mixing characteristics of non-Newtonian fluid (carboxyl methyl cellulose, CMC) in dual shaft eccentric mixer. Fluid rheology was described by the power law rheological model. Computational fluid dynamics was employed to simulate the velocity field and shear rate inside the stirred tank. The influence mechanism of the rotational modes, height difference between impellers, impeller eccentricities, and impeller types on the flow field have been well investigated. We studied the performance of different dual-shaft eccentric mixers at the constant power input with its fluid velocity profiles, average shear strain rate, mixing time and mixing energy. The counter-rotation mode shows better mixing performance than co-rotation mode, and greater eccentricity can shorten mixing time on the basis of same stirred condition. To intensify the hydrodynamic interaction between impellers and enhance the overall mixing performance of the dual shaft eccentric mixers, it is critical to have a reasonable combination of impellers and an appropriate spatial position of impellers.

Key words: Dual shaft eccentric mixers, Non-Newtonian fluid, Mixing, Laminar flow, Computational fluid dynamics

Songsong Wang, Xia Xiong, Peiqiao Liu, Qiongzhi Zhang, Qian Zhang, Changyuan Tao, Yundong Wang, Zuohua Liu. CFD simulation of hydrodynamics and mixing performance in dual shaft eccentric mixers[J]. 中国化学工程学报, 2023, 62(10): 297-309.

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CFD simulation of hydrodynamics and mixing performance in dual shaft eccentric mixers

CFD simulation of hydrodynamics and mixing performance in dual shaft eccentric mixers

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