Influence of rotating inner zone on the characteristics of flow field and torque simulated by MRF method

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Abstract The Multi-Reference Frame (MRF) method is commonly used in the numerical investigation of mixing process, however, the discussion on the size of the rotational domain is not well developed. Numerical simulations of the stirring process in a Rushton impeller mixing tank were carried out. By compared with experimental results, the optimum inner zone size was determined, and discussion on the height of the inner zone was complemented. In addition, the basis for dividing the rotating inner zone applicable to different mixing cylinder structures was proposed. The results show that the influence of the interface position is mainly in the direction of the impeller discharge flow, and the influence of the inner zone on the torque calculation is less than 5%. The proposed definition of inner domain diameter Z=(d_in-D)/(T-2b-D) can be applied to mixing equipment of different structures, the accuracy of numerical simulations is highest when the inner zone is delineated at Z=0.29, which can provide a theoretical reference for the selection of the rotating zone size under the MRF method.

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	Articles by authors
	ZHANG Wei
	CHEN Chen
	LIU Panpan

Keywords： stirred tank multi-reference frame method inner rotating zone torque

Received 2023-10-31;

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ZHANG Wei, CHEN Chen, LIU Panpan.Influence of rotating inner zone on the characteristics of flow field and torque simulated by MRF method[J] Chemcial Industry and Engineering, 2024,V41(4): 169-178

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