Measurement of detailed heat transfer along rib-roughened surface under arrays of impinging elliptic jets
| Autor: | Wei-Mon Yan, Sheng-Chin Mei |
|---|---|
| Rok vydání: | 2006 |
| Předmět: |
Fluid Flow and Transfer Processes
Jet (fluid) Rib cage Materials science business.industry Mechanical Engineering Flow (psychology) Reynolds number Heat transfer coefficient Mechanics Condensed Matter Physics medicine.disease Nusselt number symbols.namesake Optics Broken ribs Heat transfer medicine symbols business |
| Zdroj: | International Journal of Heat and Mass Transfer. 49:159-170 |
| ISSN: | 0017-9310 |
| DOI: | 10.1016/j.ijheatmasstransfer.2005.07.043 |
| Popis: | The objective of the present study is to examine the detailed heat transfer coefficient distributions over a ribbed-surface under impingement of elliptic jet arrays using a liquid crystal thermograph technique. Both continuous and broken V-shaped-rib configurations with different exit flow orientations were considered. To examine the angled rib effects, three angled ribs were discussed under jet-to-plate spacing Z = 3 for different Reynolds numbers. Measured results show that the local heat transfer rates over the ribbed-surface are characterized by obvious periodic-type variation of Nusselt number distributions. The downstream peaks are diminished for increasing crossflow effect. Compared to the results without ribs, the heat transfer over the ribbed-surface may be enhanced or retarded. Whereas, among the test angled-rib arrangements, the best heat transfer performance is obtained with a surface with 45° V-shape ribs. In addition, the surface with continuous ribs provides a better impingement heat transfer than that with broken ribs. |
| Databáze: | OpenAIRE |
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