Power consumption and flow field characteristics of a coaxialmixerwith a double inner impeller

doi:10.1016/j.cjche.2013.09.001

Chin.J.Chem.Eng. ›› 2015, Vol. 23 ›› Issue (1): 1-6.DOI: 10.1016/j.cjche.2013.09.001

• FLUID DYNAMICS AND TRANSPORT PHENOMENA • Next Articles

Power consumption and flow field characteristics of a coaxialmixerwith a double inner impeller

Baoqing Liu, Yikun Zhang, Mingqiang Chen, Peng Li, Zhijiang Jin

College of Chemical and Biological Engineering, Zhejiang University, Hangzhou 310027, China

Received:2013-04-28 Revised:2014-02-26 Online:2015-01-24 Published:2015-01-28
Contact: Zhijiang Jin
Supported by:
Supported by the Fundamental Research Funds for the Central Universities (2012QNA4018), the National Natural Science foundation of China (21206144) and the Program for Zhejiang Leading Team of S&T Innovation (2011R50005).

Power consumption and flow field characteristics of a coaxialmixerwith a double inner impeller

Baoqing Liu, Yikun Zhang, Mingqiang Chen, Peng Li, Zhijiang Jin

College of Chemical and Biological Engineering, Zhejiang University, Hangzhou 310027, China

通讯作者: Zhijiang Jin
基金资助:
Supported by the Fundamental Research Funds for the Central Universities (2012QNA4018), the National Natural Science foundation of China (21206144) and the Program for Zhejiang Leading Team of S&T Innovation (2011R50005).

Abstract

Abstract: A coaxial mixer meeting the actual demand of a system with high and variable viscosity is investigated. It has an outer wall-scraping frame and a double inner impeller consisting of a four-pitched-blade turbine and Rushton turbine. The power consumption and flow field characteristics of the coaxial mixer in laminar and transitional flow are simulated numerically, and then the distribution of velocity field, shear rate and mass flow rate are analyzed. The simulation results indicate that the outer frame has little effect on the power consumption of the double inner impeller whether in laminar or transitional flow, whereas the inner combined impeller has a great effect on the power consumption of the outer frame. Compared with the single rotation mode, the power consumption of the outer frame will decrease in co-rotation mode and increase in counter-rotation mode. The velocity, shear rate and mass flow rate are relatively high near the inner impeller in all operating modes, and only under double-shaft agitation will the mixing performance near the free surface be improved. In addition, these distributions in the co-rotation and counter-rotation modes show little difference, but the co-rotation mode is recommended for the advantage of low power consumption.

Key words: Coaxial mixer, Power consumption, Flow field characteristics, Numerical simulation

摘要： A coaxial mixer meeting the actual demand of a system with high and variable viscosity is investigated. It has an outer wall-scraping frame and a double inner impeller consisting of a four-pitched-blade turbine and Rushton turbine. The power consumption and flow field characteristics of the coaxial mixer in laminar and transitional flow are simulated numerically, and then the distribution of velocity field, shear rate and mass flow rate are analyzed. The simulation results indicate that the outer frame has little effect on the power consumption of the double inner impeller whether in laminar or transitional flow, whereas the inner combined impeller has a great effect on the power consumption of the outer frame. Compared with the single rotation mode, the power consumption of the outer frame will decrease in co-rotation mode and increase in counter-rotation mode. The velocity, shear rate and mass flow rate are relatively high near the inner impeller in all operating modes, and only under double-shaft agitation will the mixing performance near the free surface be improved. In addition, these distributions in the co-rotation and counter-rotation modes show little difference, but the co-rotation mode is recommended for the advantage of low power consumption.

关键词: Coaxial mixer, Power consumption, Flow field characteristics, Numerical simulation

Baoqing Liu, Yikun Zhang, Mingqiang Chen, Peng Li, Zhijiang Jin. Power consumption and flow field characteristics of a coaxialmixerwith a double inner impeller[J]. Chin.J.Chem.Eng., 2015, 23(1): 1-6.

Baoqing Liu, Yikun Zhang, Mingqiang Chen, Peng Li, Zhijiang Jin. Power consumption and flow field characteristics of a coaxialmixerwith a double inner impeller[J]. Chinese Journal of Chemical Engineering, 2015, 23(1): 1-6.

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Power consumption and flow field characteristics of a coaxialmixerwith a double inner impeller

Power consumption and flow field characteristics of a coaxialmixerwith a double inner impeller

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