| Title | Heat transfer in a quasi-one-dimensional Rayleigh-Benard convection cell |
| Author | |
| Corresponding Author | Xia, Ke-Qing |
| Publication Years | 2023-10-23
|
| DOI | |
| Source Title | |
| ISSN | 0022-1120
|
| EISSN | 1469-7645
|
| Volume | 973 |
| Abstract | We report an experimental and numerical study on Rayleigh-Benard convection in a slender rectangular geometry with the aspect ratio Gamma varying from 0.05 to 0.3 and a Rayleigh number range of 10(5) <= Ra <= 3 x 10(9). The Prandtl number is fixed at Pr = 4.38. It is found that the onset of convection is postponed when the convection domain approaches the quasi-one-dimensional limit. The onset Rayleigh number shows a Ra-c = 328 Gamma(-4.18) scaling for the experiment and a Ra-c = 810 Gamma(-3.95) scaling for the simulation, both consistent with a theoretical prediction of Ra-c similar to Gamma(-4). Moreover, the effective Nusselt-Rayleigh scaling exponent beta = partial derivative(log Nu)/partial derivative(log Ra) near the onset of convection also shows a rapid increase with decreasing Gamma. Power-law fits to the experimental and numerical data yield beta = 0.290 Gamma(-0.90) and beta = 0.564 Gamma(-0.92), respectively. Near onset, the flow shows a stretched cell structure. In this regime, the velocity and temperature variations in a horizontal cross-section are found to be almost invariant with height in the core region of a slender domain. As the Rayleigh number increases, the system evolves from the viscous dominant regime to a plume-controlled one, a feature of which is enhancement in the heat transport efficiency. Upon further increase of Ra, the flow comes back to the classical boundary-layer-controlled regime, in which the quasi-one-dimensional geometry has no apparent effect on the global heat transfer. |
| Keywords | |
| URL | [Source Record] |
| Indexed By | |
| Language | English
|
| SUSTech Authorship | First
; Corresponding
|
| WOS Research Area | Mechanics
; Physics
|
| WOS Subject | Mechanics
; Physics, Fluids & Plasmas
|
| WOS Accession No | WOS:001087648100001
|
| Publisher | |
| ESI Research Field | ENGINEERING
|
| Data Source | Web of Science
|
| Citation statistics | |
| Document Type | Journal Article |
| Identifier | http://kc.sustech.edu.cn/handle/2SGJ60CL/582820 |
| Department | Southern University of Science and Technology 理学院_物理系 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 3.Southern Univ Sci & Technol, Dept Phys, Shenzhen, 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; Department of Physics |
| First Author's First Affilication | Southern University of Science and Technology |
| Recommended Citation GB/T 7714 |
Zhang, Lu,Xia, Ke-Qing. Heat transfer in a quasi-one-dimensional Rayleigh-Benard convection cell[J]. JOURNAL OF FLUID MECHANICS,2023,973.
|
| APA |
Zhang, Lu,&Xia, Ke-Qing.(2023).Heat transfer in a quasi-one-dimensional Rayleigh-Benard convection cell.JOURNAL OF FLUID MECHANICS,973.
|
| MLA |
Zhang, Lu,et al."Heat transfer in a quasi-one-dimensional Rayleigh-Benard convection cell".JOURNAL OF FLUID MECHANICS 973(2023).
|
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