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Heat Transfer Characteristics on Impingement Surface with Control of Axisymmetric Jet ( 2 ) - With Acoustic Excitation -
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 Title & Authors
Heat Transfer Characteristics on Impingement Surface with Control of Axisymmetric Jet ( 2 ) - With Acoustic Excitation -
Hwang, Sang-Dong; Lee, Chang-Ho; Cho, Hyung-Hee;
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 Abstract
The flow and heat transfer characteristics on the impingement surface can be controlled by the change of vortex with the acoustic excitation, because the flow characteristics of an impinging jet are affected strongly by the vortices formed at the jet exit. To investigate the effects of acoustic excitation, we measured the velocity, turbulent intensity distributions for the free jet and local heat transfer coefficients on a impingement surface. As the acoustic excitation, subharmonic frequency of excited frequency plays an important role to the control of the jet flow. If the vortex pairings are promoted by the acoustic excitation, turbulence intensity of the jet flow is increased quickly. On the other hand if the vortex pairings are suppressed, the jet flow has low turbulence intensity at the center of the jet. Therefore, the low heat transfer rates are obtained on the impingement plate for a small nozzle-to-plate distance. However, it has high heat transfer rates at a large distance between the nozzle and plate due to the increasing of potential-core length.
 Keywords
Impinging Jet;Vortex Pairing;Potential Core;Acoustic Excitation;Heat Transfer Coefficient;
 Language
Korean
 Cited by
1.
충돌 Jet에서 Rod 형상에 따른 유동특성의 PIV 계측에 의한 연구,나우정;정진도;송민근;이상범;손승우;주은선;

한국마린엔지니어링학회지, 2004. vol.28. 1, pp.152-161
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