Research on the influence of agitator structural parameters on stirring characteristics based on fluid simulation

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Abstract Due to the characteristics of its own unique structure, conventional agitators can not meet the uniform stirring of highly viscous non-Newtonian fluids. In this study, a novel design of a combined agitator for non-Newtonian fluid agitation would be proposed, and the influencing factors of fluid agitation characteristics would be discussed. The given grease was used as the stirring medium, and the Laminar model was adopted to investigate the effects of three structural parameters (the number of blades, the height from the bottom and the blade inclination angle in the new stirrer) affected by the stirring power per unit volume, the mixing time and the effective stirring volume fraction during the stirring process by means of the Multiple Reference Frame (MRF) and the tracer concentration method. The results showed that the new combined agitator could be applied to the mixed stirring process of high-viscosity non-Newtonian fluids. Moreover, the structural parameters all affected the stirring power per unit volume, the mixing time, and the effective stirring volume fraction. Among them, the mixing time had the most significant effects. The successively decreased order of the influence of parameters on the mixing time was the number of blades, the inclination angle of the blades, and the height from the bottom. Compared with the initially setting parameters, the corresponding mixing time was shortened by 61.6% in the optimal parameters of the number of blades of 9, the height from the bottom of 50 mm, and the blade inclination angle of 45°. The results can provide better insight to develop the new agitators for similar material in the industrial field.

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	Articles by authors
	ZHOU Chupeng
	QIAN Shanhua
	REN Haidong
	BIAN Da
	NI Zifeng

Keywords： agitator non-Newtonian fluid stirring characteristics tracer concentration structural parameters mixing time

Received 2022-08-11;

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ZHOU Chupeng, QIAN Shanhua, REN Haidong, BIAN Da, NI Zifeng.Research on the influence of agitator structural parameters on stirring characteristics based on fluid simulation[J] Chemcial Industry and Engineering, 2024,V41(3): 124-134

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