Effects of Pulsating Strouhal Number on Heat Transfer around a Heated Cylinder in Pulsating Cross-Flow
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概要
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An experimental study was conducted to investigate the effect of pulsating Strouhal number, Sr_p, on flow and heat transfer around a heated cylinder in a pulsating cross-flow. The averaged Reynolds number was kept at 400 while the oscillatory Reynolds number was changed from 40 to 300. Pulsating Strouhal number, Sr_p, ranged from 0 to 1.37. Two marked peaks of the mean Nusselt number were observed at approximately Sr_p =0.2 and 0.6. Flow visualization experiments revealed that twin symmetric vortices were periodically formed behind the cylinder at Sr_p corresponding to the 'lock-on' of the shedding of vortices. From the velocity field measured by particle image velocimetry (PIV), it was determined that the flow reversal approaching the back surface of the cylinder was intensfied by the twin vortices. This flow reversal caused heat transfer enhancement on the back surface of the cylinder.
- 一般社団法人日本機械学会の論文
- 2000-05-15
著者
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Suzuki Hiroshi
Graduate School Of Pharmaceutical Sciences The University Of Tokyo
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Kikuchi Yoshihiro
Faculty Of Engineering Hiroshima University
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KITAGAWA Masonori
Mitsubishi Heavy Industries Ltd.
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IKEYA Ken-ichiro
Honda Motor Co. Ltd.
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Kitagawa Masanori
Mitsubishi Heavy Industries Ltd.
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SUZUKI Hiroshi
Graduate School of Computer Science and System Engineering Kyushu Institute of Technology
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