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	Time evolution of double-diffusive convection in a vertical cylinder with radial temperature and axial solutal gradients
	Shi, KF; Lu, WQ
刊名	International journal of heat and mass transfer
	2006-03-01
卷号	49期号:5-6页码:995-1003
关键词	Double-diffusive convection Buoyancy ratio Dead region Fluctuation
ISSN号	0017-9310
DOI	10.1016/j.ijheatmasstransfer.2005.09.009
通讯作者	Lu, wq()
英文摘要	The characteristics of transient double-diffusive convection in a vertical cylinder are numerically simulated using a finite element method. initially the fluid in the cavity is at uniform temperature and solute concentration, then constant temperature and solute concentration, which are lower than their initial values, are imposed along the sidewall and bottom wall, respectively. the time evolution of the double-diffusive convection is investigated for specific parameters, which are the prandtl number, pr = 7, the lewis number, le = 5, the thermal grashof number, gr(t) = 10(7), and the aspect ratio, a = 2, of the enclosure. the objective of the work is to identify the effect of the buoyancy ratio (the ratio of solutal grashof to thermal grashof numbers: n = gr(s)/gr(t)) on the evolution of the flow field, temperature and solute field in the cavity. it is found that initially the fluid near the bottom wall is squeezed by the cold flow from the sidewall, a crest of the solute field forms and then pushed to the symmetry line. in the case of n > 0, a domain with higher temperature and weak flow (dead region) forms on the bottom wall near the symmetry line, and the area of dead region increases when n varies from 0.5 to 1.5. more crests of the solute field are formed and the flow near the bottom wall fluctuates continuously for n < 0. the frequency of the fluctuation increases when n varies from -0.5 to -1.5. corresponding to the variety of the thermal and solutal boundary layers, the average rates of heat transfer (nu) at the sidewall remain almost unchanged while the average rates of mass transfer (sh) at the bottom wall change much in the cases of n = 1, 0, -1. (c) 2005 elsevier ltd. all rights reserved.
WOS关键词	STABLY STRATIFIED FLUID ; SATURATED POROUS-MEDIUM ; HORIZONTAL TEMPERATURE ; NATURAL-CONVECTION ; DIRECTIONAL SOLIDIFICATION ; RECTANGULAR ENCLOSURE ; OPPOSING TEMPERATURE ; CAVITY ; SYSTEM
WOS研究方向	Thermodynamics ; Engineering ; Mechanics
WOS类目	Thermodynamics ; Engineering, Mechanical ; Mechanics
语种	英语
出版者	PERGAMON-ELSEVIER SCIENCE LTD
WOS记录号	WOS:000236120900016
内容类型	期刊论文
URI标识	http://www.corc.org.cn/handle/1471x/2378984
专题	中国科学院大学
通讯作者	Lu, WQ
作者单位	Chinese Acad Sci, Grad Sch, Coll Phys Sci, Beijing 100049, Peoples R China
推荐引用方式 GB/T 7714	Shi, KF,Lu, WQ. Time evolution of double-diffusive convection in a vertical cylinder with radial temperature and axial solutal gradients[J]. International journal of heat and mass transfer,2006,49(5-6):995-1003.
APA	Shi, KF,&Lu, WQ.(2006).Time evolution of double-diffusive convection in a vertical cylinder with radial temperature and axial solutal gradients.International journal of heat and mass transfer,49(5-6),995-1003.
MLA	Shi, KF,et al."Time evolution of double-diffusive convection in a vertical cylinder with radial temperature and axial solutal gradients".International journal of heat and mass transfer 49.5-6(2006):995-1003.

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