Hydrodynamics in unbaffled liquid-solid stirred tanks with free surface studied by DEM-VOF method

doi:10.1016/j.cej.2019.122846

	Hydrodynamics in unbaffled liquid-solid stirred tanks with free surface studied by DEM-VOF method
	Kang, Qianqian 1; He, Dapeng 1; Zhao, Na 1; Feng, Xin 2,3; Wang, Jingtao 1
刊名	CHEMICAL ENGINEERING JOURNAL
	2020-04-15
卷号	386 页码:17
关键词	DEM-VOF coupling method Liquid-solid stirred tanks Free surface Tank geometries Suspension dynamics
ISSN号	1385-8947
DOI	10.1016/j.cej.2019.122846
英文摘要	DEM-VOF simulations of particle suspension dynamics in unbaffled liquid-solid stirred tanks with free surface were performed in conjunction with RSM turbulence model. The two-way coupling of particle and fluid was achieved by solving Gidaspow's drag force, non-drag force and source term in the momentum equation. The calculation of particle volume in the fluid was realized by the porous model. Particle-particle and particle-wall interactions were also considered. A four-blade 45 degrees pitched blade turbine was used, and the sliding-grid has been adopted to simulate impeller rotating. DEM-VOF coupling method was validated by theories and experiments. The effects of tank geometries, impeller rotating speed, particle density, diameter and volume fraction on the free surface vortex, flow patterns and particle suspension dynamics were investigated by DEM-VOF method for the first time. Results indicate that the particle-fluid interaction has important effects on the flow field and particle distribution. The modifications of tank geometries substantially influence flow patterns and particle suspension behaviors. The profiled bottom could eliminate sharp flow diversions completely. It can give rise to off-bottom suspension of particles and an elimination of the surface vortex due to particle-fluid interaction for large solid holdup and large particle diameter. Furthermore, the base of the profiled bottom tank was optimized. The reported research data has important guiding significance for the design of stirred tanks.
资助项目	National Science Foundation of China[21576185] ; National Science Foundation of China[21376162]
WOS关键词	FLUID-DYNAMICS SIMULATION ; CFD-DEM ; NUMERICAL-SIMULATION ; AGITATED TANKS ; IMPELLER SPEED ; SUSPENSION ; PREDICTION ; FLOW ; GAS ; PARTICLES
WOS研究方向	Engineering
语种	英语
出版者	ELSEVIER SCIENCE SA
WOS记录号	WOS:000548623400005
资助机构	National Science Foundation of China
内容类型	期刊论文
源URL	[http://ir.ipe.ac.cn/handle/122111/41436]
专题	中国科学院过程工程研究所
通讯作者	Feng, Xin; Wang, Jingtao
作者单位	1.Tianjin Univ, Sch Chem Engn & Technol, Tianjin 300072, Peoples R China 2.Chinese Acad Sci, Inst Proc Engn, Key Lab Green Proc & Engn, Beijing 100190, Peoples R China 3.Univ Chinese Acad Sci, Sch Chem Engn, Beijing 100049, Peoples R China
推荐引用方式 GB/T 7714	Kang, Qianqian,He, Dapeng,Zhao, Na,et al. Hydrodynamics in unbaffled liquid-solid stirred tanks with free surface studied by DEM-VOF method[J]. CHEMICAL ENGINEERING JOURNAL,2020,386:17.
APA	Kang, Qianqian,He, Dapeng,Zhao, Na,Feng, Xin,&Wang, Jingtao.(2020).Hydrodynamics in unbaffled liquid-solid stirred tanks with free surface studied by DEM-VOF method.CHEMICAL ENGINEERING JOURNAL,386,17.
MLA	Kang, Qianqian,et al."Hydrodynamics in unbaffled liquid-solid stirred tanks with free surface studied by DEM-VOF method".CHEMICAL ENGINEERING JOURNAL 386(2020):17.