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

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

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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 fea-tures,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.

Mixing timeCFDStirred tankSecondary flowMixing performance

Yuan Yao、Peiqiao Liu、Qian Zhang、Zequan Li、Benjun Xi、Changyuan Tao、Yundong Wang、Zuohua Liu

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School of Chemistry and Chemical Engineering,Chongqing University,Chongqing 400044,China

Hubei Three Gorges Laboratory,Yichang 443007,China

Department of Chemical Engineering,Tsinghua University,Beijing 100084,China

国家重点研发计划国家重点研发计划国家自然科学基金国家自然科学基金Key Project of Independent Research Project of State Key Laboratory of Coal Mine Disaster Dynamics and ControlThree Gorges Laboratory Open Fund of Hubei ProvinceThree Gorges Laboratory Open Fund of Hubei Province

2022YFB35043052019YFC190580222078030U18022552011DA105287-zd201902SK211009SK215001

2024

10.1016/j.cjche.2023.06.010

中国化学工程学报(英文版)
中国化工学会

中国化学工程学报(英文版)

CSTPCDEI
影响因子：0.818
ISSN：1004-9541
年,卷(期)：2024.65(1)
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