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Effect of aspect ratio of elliptical stirred vessel on mixing time and flow field characteristics in the absence of baffles

作     者:Yuan Yao Peiqiao Liu Qian Zhang Zequan Li Benjun Xi Changyuan Tao Yundong Wang Zuohua Liu Yuan Yao;Peiqiao Liu;Qian Zhang;Zequan Li;Benjun Xi;Changyuan Tao;Yundong Wang;Zuohua Liu

作者机构:School of Chemistry and Chemical EngineeringChongqing UniversityChongqing 400044China Hubei Three Gorges LaboratoryYichang 443007China Department of Chemical EngineeringTsinghua UniversityBeijing 100084China 

出 版 物:《Chinese Journal of Chemical Engineering》 (中国化学工程学报(英文版))

年 卷 期:2024年第65卷第1期

页      面:63-74页

核心收录:

学科分类:080706[工学-化工过程机械] 08[工学] 0807[工学-动力工程及工程热物理] 

基  金:supported by the National Key Research and Development Project(2022YFB3504305,2019YFC1905802) National Natural Science Foundation of China(22078030) Joint Funds of the National Natural Science Foundation of China(U1802255) Key Project of Independent Research Project of State Key Laboratory of Coal Mine Disaster Dynamics and Control(2011DA105287-zd201902) Three Gorges Laboratory Open Fund of Hubei Province(SK211009,SK215001) 

主  题:Mixing time CFD Stirred tank Secondary flow Mixing performance 

摘      要:Elliptical tanks were used as an alternative to circular tanks in order to improve mixing efficiency and reduce mixing time in unbaffled stirred tanks(USTs). Five different aspect ratios of elliptical vessels were designed to compare their mixing time and flow field. Computational fluid dynamics(CFD) simulations were performed using the k–ε model to calculate the mixing time and simulate turbulent flow field features, such as streamline shape, velocity distribution, vortex core region distribution, and turbulent kinetic energy(TKE) transfer. Visualization was also carried out to track the tinctorial evolution of the liquid phase. Results reveal that elliptical stirred tanks can significantly improve mixing performance in USTs. Specifically, the mixing time at an aspect ratio of 2.00 is only 45.3% of the one of a circular stirred tank. Furthermore, the secondary flow is strengthened and the vortex core region increases with the increase of aspect ratio. The axial velocity is more sensitive to the aspect ratio than the circumferential and radial velocity. Additionally, the TKE transfer in elliptical vessels is altered. These findings suggest that elliptical vessels offer a promising alternative to circular vessels for enhancing mixing performance in USTs.

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