Title | Three-dimensional properties of the viscous boundary layer in turbulent Rayleigh-Benard convection |
Author | |
Corresponding Author | Zhang, Lu; Xia, Ke-Qing |
Publication Years | 2022-08-22
|
DOI | |
Source Title | |
ISSN | 0022-1120
|
EISSN | 1469-7645
|
Volume | 947Pages: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 | |
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 Type | Journal Article |
Identifier | http://kc.sustech.edu.cn/handle/2SGJ60CL/382569 |
Department | Southern University of Science and Technology 工学院_力学与航空航天工程系 |
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 Affilication | Southern University of Science and Technology; Department of Mechanics and Aerospace Engineering |
Corresponding Author Affilication | Southern University of Science and Technology; Department of Mechanics and Aerospace Engineering |
First Author's First Affilication | Southern 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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