中文版 | English
Title

Flow states and heat transport in liquid metal convection

Author
Corresponding AuthorXie, Yi-Chao
Publication Years
2022-10-28
DOI
Source Title
ISSN
0022-1120
EISSN
1469-7645
Volume951
Abstract
We present an experimental study of Rayleigh-Benard convection using liquid metal alloy gallium-indium-tin as the working fluid with a Prandtl number of Pr = 0.029. The flow state and the heat transport were measured in a Rayleigh number range of 1.2 x 10(4) <= Ra <= 1.3 x 10(7). The temperature fluctuation at the cell centre is used as a proxy for the flow state. It is found that, as Ra increases from the lower end of the parameter range, the flow evolves from a convection state to an oscillation state, a chaotic state and finally a turbulent state for Ra > 10(5). The study suggests that the large-scale circulation in the turbulent state is a residual of the cell structure near the onset of convection, which is in contrast with the case of Pr similar to 1, where the cell structure is transiently replaced by high order flow modes before the emergence of the large-scale circulation in the turbulent state. The evolution of the flow state is also reflected by the heat transport characterised by the Nusselt number Nu and the probability density function (p.d.f.) of the temperature fluctuation at the cell centre. It is found that the effective local heat transport scaling exponent gamma, i.e. Nu similar to Ra-gamma, changes continuously from gamma = 0.49 at Ra similar to 10(4) to gamma = 0.25 for Ra > 10(6). Meanwhile, the p.d.f. at the cell centre gradually evolves from a Gaussian-like shape before the transition to turbulence to an exponential-like shape in the turbulent state. For Ra > 10(6), the flow shows self-similar behaviour, which is revealed by the universal shape of the p.d.f. of the temperature fluctuation at the cell centre and a Nu = 0.19Ra(0.25) scaling for the heat transport.
Keywords
URL[Source Record]
Indexed By
Language
English
SUSTech Authorship
Others
Funding Project
National Natural Science Foundation of China (NSFC)["12002260","92152104"]
WOS Research Area
Mechanics ; Physics
WOS Subject
Mechanics ; Physics, Fluids & Plasmas
WOS Accession No
WOS:000876074900001
Publisher
ESI Research Field
ENGINEERING
Data Source
Web of Science
Citation statistics
Cited Times [WOS]:1
Document TypeJournal Article
Identifierhttp://kc.sustech.edu.cn/handle/2SGJ60CL/412154
DepartmentSouthern University of Science and Technology
工学院_力学与航空航天工程系
Affiliation
1.Xi An Jiao Tong Univ, State Key Lab Strength & Vibrat Mech Struct, Xian 710049, Peoples R China
2.Xi An Jiao Tong Univ, Sch Aerosp, Xian 710049, Peoples R China
3.Southern Univ Sci & Technol, Ctr Complex Flows & Soft Matter Res, Shenzhen 518055, Peoples R China
4.Southern Univ Sci & Technol, Dept Mech & Aerosp Engn, Shenzhen 518055, Peoples R China
5.Univ Chinese Acad Sci, Sch Engn Sci, Beijing 100049, Peoples R China
Recommended Citation
GB/T 7714
Ren, Lei,Tao, Xin,Zhang, Lu,et al. Flow states and heat transport in liquid metal convection[J]. JOURNAL OF FLUID MECHANICS,2022,951.
APA
Ren, Lei,Tao, Xin,Zhang, Lu,Ni, Ming-Jiu,Xia, Ke-Qing,&Xie, Yi-Chao.(2022).Flow states and heat transport in liquid metal convection.JOURNAL OF FLUID MECHANICS,951.
MLA
Ren, Lei,et al."Flow states and heat transport in liquid metal convection".JOURNAL OF FLUID MECHANICS 951(2022).
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