| Title | Achieving heat transfer enhancement via manipulation of bulk flow structures in turbulent thermal convection |
| Author | |
| Corresponding Author | Zhang, Lu |
| Publication Years | 2023-02-03
|
| DOI | |
| Source Title | |
| ISSN | 2469-990X
|
| Volume | 8Issue:2 |
| Abstract | We report an experimental study on the enhancement of heat transfer efficiency in turbulent thermal convection via manipulation of the bulk flow, which is achieved by inserting artificial structures into the convection domain. These structures are designed to alter the bulk flow without perturbing the boundary layer. Two types of convective domains are designed and fabricated. The Type-I domain has an extruded square grid structure in the bulk and the Type-II domain can be viewed as a modification to the first one that devides the domain into parallel connected dual-channel structures. The working fluid is water at a Prandtl number of Pr = 4.3 and the Rayleigh number covers a range of 6.4 x 10(7) <= Ra <= 8.5 x 10(9). It is found that structuring the bulk flow can enhance the Nusselt number by a factor of up to 14% for the Type-I domain and by 30% for the Type-II domain, respectively. Local temperature and velocity field measurements reveal that the enhancement in Nusselt number results from both an increase in plume coherency and an enhanced flow strength. The later feature is in sharp contrast with the significantly reduced flow strength found in geometrical-confinement-induced heat transfer enhancement reported in previous studies. Our results thus shed new light on flow manipulation and inspire future research on the optimization of thermal control. |
| URL | [Source Record] |
| Indexed By | |
| Language | English
|
| SUSTech Authorship | First
; Corresponding
|
| Funding Project | National Natural Science Foundation of China["12202173","12072144","12232010"]
; Research Grants Council of Hong Kong SAR[CUHK14302317]
|
| WOS Research Area | Physics
|
| WOS Subject | Physics, Fluids & Plasmas
|
| WOS Accession No | WOS:000928834200001
|
| Publisher | |
| Data Source | Web of Science
|
| Citation statistics |
Cited Times [WOS]:0
|
| Document Type | Journal Article |
| Identifier | http://kc.sustech.edu.cn/handle/2SGJ60CL/501430 |
| Department | Department 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 3.Chinese Univ Hong Kong, Dept Phys, Shatin, Hong Kong, Peoples R China |
| First Author Affilication | Southern University of Science and Technology |
| Corresponding Author Affilication | Southern University of Science and Technology |
| First Author's First Affilication | Southern University of Science and Technology |
| Recommended Citation GB/T 7714 |
Zhang, Lu,Xia, Ke-Qing. Achieving heat transfer enhancement via manipulation of bulk flow structures in turbulent thermal convection[J]. Physical Review Fluids,2023,8(2).
|
| APA |
Zhang, Lu,&Xia, Ke-Qing.(2023).Achieving heat transfer enhancement via manipulation of bulk flow structures in turbulent thermal convection.Physical Review Fluids,8(2).
|
| MLA |
Zhang, Lu,et al."Achieving heat transfer enhancement via manipulation of bulk flow structures in turbulent thermal convection".Physical Review Fluids 8.2(2023).
|
| Files in This Item: | There are no files associated with this item. | |||||
Items in the repository are protected by copyright, with all rights reserved, unless otherwise indicated.
;
Edit Comment