Research on fluid motion characteristics and structural evolution in reciprocating mixing tanks

IF 3.7 3区工程技术 Q2 ENGINEERING, CHEMICAL

Chinese Journal of Chemical Engineering Pub Date : 2025-03-01 DOI:10.1016/j.cjche.2024.12.001

Li Wang , Shibo Wang , Huiqiang Yang , Yuling Zhai , Jianxin Xu

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Abstract

A new stirring method, reciprocating stirring, is developed by incorporating a periodic axial reciprocating motion into conventional stirring. This study employs computational fluid dynamics methods, utilizing volume of fluid and user-defined functions to control and analyze the flow field characteristics in a reciprocating stirred tank. Compared to conventional stirring, reciprocating stirring increases the overall fluid velocity by approximately 7.9%, turbulent kinetic energy (TKE) by 35.9% to 45.6%, and the turbulent dissipation rate by 10.6% to 15.7%. The primary reason is the dynamic integration of multiple flow regions, which enhances fluid interface interactions. Additionally, the study investigates the dynamic evolution of the vortex structure, uncovering the correlation between the impeller's start-stop behavior and the vortex area. The optimal impeller plate designs, forward sine-4/12D and reverse sine-5/12D, were determined based on the effective area of TKE. Reciprocating stirring, in comparison to conventional stirring, enhances secondary flow intensity by 67.3% to 93.7% and shortens mixing time by 56.6% to 173.0%.

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往复搅拌槽内流体运动特性及结构演化研究

在传统的搅拌方式中加入周期性轴向往复运动，形成了一种新的搅拌方式——往复搅拌。本研究采用计算流体力学方法，利用流体体积和用户自定义函数对往复搅拌槽内的流场特性进行控制和分析。与常规搅拌相比，往复搅拌可使流体总流速提高约7.9%，湍流动能（TKE）提高35.9% ~ 45.6%，湍流耗散率提高10.6% ~ 15.7%。其主要原因是多流区的动态集成，增强了流体界面的相互作用。此外，研究了涡结构的动态演变，揭示了叶轮启停特性与涡面积的关系。基于TKE的有效面积，确定了正向4/ 12d和反向5/ 12d的最佳叶轮板设计。往复搅拌与常规搅拌相比，二次流强度提高67.3% ~ 93.7%，混合时间缩短56.6% ~ 173.0%。

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来源期刊

Chinese Journal of Chemical Engineering 工程技术-工程：化工

CiteScore

6.60

自引率

5.30%

发文量

4309

审稿时长

31 days

期刊介绍： The Chinese Journal of Chemical Engineering (Monthly, started in 1982) is the official journal of the Chemical Industry and Engineering Society of China and published by the Chemical Industry Press Co. Ltd. The aim of the journal is to develop the international exchange of scientific and technical information in the field of chemical engineering. It publishes original research papers that cover the major advancements and achievements in chemical engineering in China as well as some articles from overseas contributors. The topics of journal include chemical engineering, chemical technology, biochemical engineering, energy and environmental engineering and other relevant fields. Papers are published on the basis of their relevance to theoretical research, practical application or potential uses in the industry as Research Papers, Communications, Reviews and Perspectives. Prominent domestic and overseas chemical experts and scholars have been invited to form an International Advisory Board and the Editorial Committee. It enjoys recognition among Chinese academia and industry as a reliable source of information of what is going on in chemical engineering research, both domestic and abroad.