Abstract
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.
基金项目
国家重点研发计划(2022YFB3504305)
国家重点研发计划(2019YFC1905802)
国家自然科学基金(22078030)
国家自然科学基金(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)
Three Gorges Laboratory Open Fund of Hubei Province(SK215001)
NETL
NSTL
万方数据