Small-scale concave spherical pits, which have a special effect on heat transfer enhancement and turbulent drag reduction, are investigated by numerical simulation in detail. Two kinds of small-scale concave pits structures are designed on surface of a plate, which are located in the bottom of a rectangle channel. The characteristics of heat transfer and flow in channel are investigated and compared with a same channel with plate bottom by means of LES. Flow structure and temperature distribution near the pits are analyzed. The numerical simulation results indicate that the concave spherical pits disturb the flow field and vortex is induced by the pits. The turbulent coherent structure is affected by the induced vortex. The numerical simulation indicates that small scale pit can generate the vortex in couple. The range of vortex is accord with the array of small scale pit. The small scale pit can enhance the intensity of vortex. As a result, the temperature field near the pit is changed with generation of the vortex. The heat transfer mechanism on plate with small scale concave spherical pit is summarized.
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ASME 2008 First International Conference on Micro/Nanoscale Heat Transfer
June 6–9, 2008
Tainan, Taiwan
Conference Sponsors:
- Nanotechnology Institute
ISBN:
0-7918-4292-4
PROCEEDINGS PAPER
Characteristics of Heat Transfer and Flow on a Surface With Small-Scale Concave Spherical Pits
L. Y. Li
L. Y. Li
Tianjin University, Tianjin, China
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J. S. Wang
Tianjin University, Tianjin, China
Y. Qiu
Tianjin University, Tianjin, China
L. Y. Li
Tianjin University, Tianjin, China
Paper No:
MNHT2008-52191, pp. 371-377; 7 pages
Published Online:
June 22, 2009
Citation
Wang, JS, Qiu, Y, & Li, LY. "Characteristics of Heat Transfer and Flow on a Surface With Small-Scale Concave Spherical Pits." Proceedings of the ASME 2008 First International Conference on Micro/Nanoscale Heat Transfer. ASME 2008 First International Conference on Micro/Nanoscale Heat Transfer, Parts A and B. Tainan, Taiwan. June 6–9, 2008. pp. 371-377. ASME. https://doi.org/10.1115/MNHT2008-52191
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