基于流体仿真的搅拌器结构参数对搅拌特性影响研究

摘要常规搅拌器因其自身结构的特性,无法满足高黏性非牛顿流体的均匀搅拌。本论文拟开展一种面向非牛顿流体搅拌的组合式搅拌器设计,讨论流体搅拌特性的影响因素。以润滑脂为搅拌介质,采用Laminar模型,通过多重参考系法(Multiple reference frame,MRF)和示踪剂浓度法研究新型搅拌器内桨叶片数量、离底高度、叶片倾斜角等结构参数对搅拌过程中单位体积搅拌功率、混合时间、有效搅拌体积分数的影响。结果表明该组合式搅拌器能够应用于高黏性非牛顿流体的混合搅拌;结构参数对单位体积搅拌功率、混合时间、有效搅拌体积分数均有影响,而混合时间受影响最为显著,各结构参数对混合时间影响的主次顺序为:叶片数量＞叶片倾斜角＞离底高度。与初始设置相比,最优参数即叶片数量为9个、离底高度为50 mm、叶片倾斜角为45°时,对应的混合时间缩短了61.6%。研究结果能够为工业领域中类似的流体原料搅拌设计提供较好的技术参考。

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	周储朋
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	倪自丰

关键词：搅拌器非牛顿流体搅拌特性示踪剂浓度结构参数混合时间

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.

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

Received 2022-08-11;

Fund:江苏省食品先进制造装备技术重点实验室自主研究课题资助项目(FMZ202204)。

Corresponding Authors: 钱善华,教授,E-mail:qianjnwx@126.com。 Email: qianjnwx@126.com

About author: 周储朋(1996-),男,硕士研究生,现从事流体仿真与分析计算方面的研究。

引用本文:

周储朋, 钱善华, 任海栋, 卞达, 倪自丰.基于流体仿真的搅拌器结构参数对搅拌特性影响研究[J]. 化学工业与工程, 2024,41(3): 124-134

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, 2024,41(3): 124-134

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