中文版 | English
Title

Three-dimensional properties of the viscous boundary layer in turbulent Rayleigh-Benard convection

Author
Corresponding AuthorZhang, Lu; Xia, Ke-Qing
Publication Years
2022-08-22
DOI
Source Title
ISSN
0022-1120
EISSN
1469-7645
Volume947Pages:A15
Abstract

We report an experimental study of the viscous boundary layer (BL) properties of turbulent Rayleigh-Benard convection in a cylindrical cell. The velocity profile with all three components was measured from the centre of the bottom plate by an integrated home-made particle image velocimetry system. The Rayleigh number Ra varied in the range 1.82 x 10(8) <= Ra <= 5.26 x 10(9) and the Prandtl number Pr was fixed at Pr = 4.34. The probability density function of the wall-shear stress indicates that using the velocity component in the mean large-scale circulation (LSC) plane alone may not be sufficient to characterise the viscous BL. Based on a dynamic wall-shear frame, we propose a method to reconstruct the measured full velocity profile which eliminates the effects of complex dynamics of the LSC. Various BL properties including the eddy viscosity are then obtained and analysed. It is found that, in the dynamic wall-shear frame, the eddy viscosity profiles along the centre line of the convection cell at different Ra all collapse on a single master curve described by nu(d)(t)/nu = 0.81 (z/delta(d)(u))(3.10 +/- 0.05) The Rayleigh number dependencies of several BL quantities are also determined in the dynamic frame, including the BL thickness delta(d)(u)(similar to Ra-0.21), the Reynolds number Re-d (similar to Ra--(0.)46) and the shear Reynolds number Re-s(d)(similar to Ra-0.24) Within the experimental uncertainty, these scaling exponents are the same as those obtained in the static laboratory frame. Finally, with the measured full velocity profile, we obtain the energy dissipation rate at the centre of the bottom plate epsilon(w), which is found to follow similar to Ra-1.25.

Keywords
URL[Source Record]
Indexed By
SCI ; EI
Language
English
SUSTech Authorship
First ; Corresponding
Funding Project
National Natural Science Foundation of China (NSFC)[12072144] ; China Postdoctoral Science Foundation[2021M701579]
WOS Research Area
Mechanics ; Physics
WOS Subject
Mechanics ; Physics, Fluids & Plasmas
WOS Accession No
WOS:000842502200001
Publisher
EI Accession Number
20223712723387
EI Keywords
Atmospheric Thermodynamics ; Boundary Layer Flow ; Boundary Layers ; Energy Dissipation ; Natural Convection ; Prandtl Number ; Probability Density Function ; Shear Flow ; Shear Stress ; Turbulence ; Turbulent Flow ; Velocity ; Velocity Measurement ; Viscosity
ESI Classification Code
Atmospheric Properties:443.1 ; Energy Losses (Industrial And Residential):525.4 ; Fluid Flow, General:631.1 ; Thermodynamics:641.1 ; Heat Transfer:641.2 ; Probability Theory:922.1 ; Physical Properties Of Gases, Liquids And Solids:931.2 ; Special Purpose Instruments:943.3
ESI Research Field
ENGINEERING
Data Source
Web of Science
Citation statistics
Cited Times [WOS]:0
Document TypeJournal Article
Identifierhttp://kc.sustech.edu.cn/handle/2SGJ60CL/382569
DepartmentDepartment of Mechanics and Aerospace Engineering
Affiliation
1.Southern Univ Sci & Technol, Ctr Complex Flows & Soft Matter Res, Shenzhen 518055, Peoples R China
2.Southern Univ Sci & Technol, Dept Mech & Aerosp Engn, Shenzhen 518055, Peoples R China
First Author AffilicationSouthern University of Science and Technology;  Department of Mechanics and Aerospace Engineering
Corresponding Author AffilicationSouthern University of Science and Technology;  Department of Mechanics and Aerospace Engineering;  
First Author's First AffilicationSouthern University of Science and Technology
Recommended Citation
GB/T 7714
Xu, Fang,Zhang, Lu,Xia, Ke-Qing. Three-dimensional properties of the viscous boundary layer in turbulent Rayleigh-Benard convection[J]. JOURNAL OF FLUID MECHANICS,2022,947:A15.
APA
Xu, Fang,Zhang, Lu,&Xia, Ke-Qing.(2022).Three-dimensional properties of the viscous boundary layer in turbulent Rayleigh-Benard convection.JOURNAL OF FLUID MECHANICS,947,A15.
MLA
Xu, Fang,et al."Three-dimensional properties of the viscous boundary layer in turbulent Rayleigh-Benard convection".JOURNAL OF FLUID MECHANICS 947(2022):A15.
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