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Heat Transfer Characteristics on Impingement Surface with Control of Axisymmetric Jet(I)
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 Title & Authors
Heat Transfer Characteristics on Impingement Surface with Control of Axisymmetric Jet(I)
Lee, Chang-Ho; Kim, Yeong-Seok; Jo, Hyeong-Hui;
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 Abstract
The present experiment is conducted to investigate heat transfer characteristics on the impinging surface with secondary flows around circular nozzle jets. The changed vortex pattern around jet affects significantly the flow characteristics and heat transfer coefficients on the impinging surface. The effects of the jet vortex control are also considered with jet nozzle-to-plate distances and main jet velocities. The vortex pattern around a jet is changed from a convective instability to an absolute instability with a velocity suction ratio of the main jet and the secondary counterflow. With the absolute instability condition, the jet potential core length increases and the heat transfer on the impinging surface is increased by small scale eddies. The region of high heat transfer coefficients is enlarged with the high Reynolds number due to increasing secondary peak values. The effect of suction flows is influenced largely with collars attached the exit of the jet nozzle because the attached collar guides well the counterflow around the main jet.
 Keywords
Impinging Jet;Jet Vortex Control;Jet Suction Ratio;Heat Transfer Coefficient;Uniform Heat Flux;
 Language
Korean
 Cited by
1.
원형제트출구 전단류 조절에 따른 제트충돌면에서의 열전달 특성 ( 2 ) - 음향여기된 제트 -,황상동;이창호;조형희;

대한기계학회논문집B, 2000. vol.24. 3, pp.373-381 crossref(new window)
2.
노즐출구에 삽입된 다중관에 의한 충돌제트의 유동 및 열전달 특성,황상동;조형희;

대한기계학회논문집B, 2004. vol.28. 2, pp.135-145 crossref(new window)
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