Calculation of Metzner Constant for Double Helical Ribbon Impeller by Computational Fluid Dynamic Method

Chinese Journal of Chemical Engineering ›› 2008, Vol. 16 ›› Issue (5): 686-692.

Calculation of Metzner Constant for Double Helical Ribbon Impeller by Computational Fluid Dynamic Method

张敏革¹, 张吕鸿¹, 姜斌^1,2, 尹玉国¹, 李鑫钢^1,2

1. School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China;
2. National Engineering Research Centre of Distillation Technology, Tianjin 300072, China

收稿日期:2007-11-11 修回日期:2008-07-10 出版日期:2008-10-28 发布日期:2008-10-28
通讯作者: ZHANG Lühong,E-mail:zhanglvh@tju.edu.cn
基金资助:
the Natural Science Foundation of Tianjin(07JCZDJC02600).

Calculation of Metzner Constant for Double Helical Ribbon Impeller by Computational Fluid Dynamic Method

ZHANG Minge¹, ZHANG Lühong¹, JIANG Bin^1,2, YIN Yuguo¹, LI Xingang^1,2

1. School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China;
2. National Engineering Research Centre of Distillation Technology, Tianjin 300072, China

Received:2007-11-11 Revised:2008-07-10 Online:2008-10-28 Published:2008-10-28
Supported by:
the Natural Science Foundation of Tianjin(07JCZDJC02600).

摘要/Abstract

摘要： Using the multiple reference frames(MRF)impeller method,the three-dimensional non-Newtonian flow field generated by a double helical ribbon(DHR)impeller has been simulated.The velocity field calculated by the numerical simulation was similar to the previous studies and the power constant agreed well with the experimental data.Three computational fluid dynamic(CFD)methods,labeled I,Ⅱ and Ⅲ,were used to compute the Metzner constant ks.The results showed that the calculated value from the slop method(method I)was consistent with the experimental data.Method II,which took the maximal circumference-average shear rate around the impeller as the effective shear rate to compute ks,also showed good agreement with the experiment.However,both methods suffer from the complexity of calculation procedures.A new method(method Ⅲ)was devised in this paper to use the area-weighted average viscosity around the impeller as the effective viscosity for calculating ks.Method Ⅲshowed both good accuracy and ease of use.

关键词: computational fluid dynamic, double helical ribbon impeller, non-Newtonian fluid, Metzner constant

Abstract: Using the multiple reference frames(MRF)impeller method,the three-dimensional non-Newtonian flow field generated by a double helical ribbon(DHR)impeller has been simulated.The velocity field calculated by the numerical simulation was similar to the previous studies and the power constant agreed well with the experimental data.Three computational fluid dynamic(CFD)methods,labeled I,Ⅱ and Ⅲ,were used to compute the Metzner constant ks.The results showed that the calculated value from the slop method(method I)was consistent with the experimental data.Method II,which took the maximal circumference-average shear rate around the impeller as the effective shear rate to compute ks,also showed good agreement with the experiment.However,both methods suffer from the complexity of calculation procedures.A new method(method Ⅲ)was devised in this paper to use the area-weighted average viscosity around the impeller as the effective viscosity for calculating ks.Method Ⅲshowed both good accuracy and ease of use.

Key words: computational fluid dynamic, double helical ribbon impeller, non-Newtonian fluid, Metzner constant

张敏革, 张吕鸿, 姜斌, 尹玉国, 李鑫钢. Calculation of Metzner Constant for Double Helical Ribbon Impeller by Computational Fluid Dynamic Method[J]. Chinese Journal of Chemical Engineering, 2008, 16(5): 686-692.

ZHANG Minge, ZHANG Lühong, JIANG Bin, YIN Yuguo, LI Xingang. Calculation of Metzner Constant for Double Helical Ribbon Impeller by Computational Fluid Dynamic Method[J]. Chin.J.Chem.Eng., 2008, 16(5): 686-692.

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Calculation of Metzner Constant for Double Helical Ribbon Impeller by Computational Fluid Dynamic Method

Calculation of Metzner Constant for Double Helical Ribbon Impeller by Computational Fluid Dynamic Method

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