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The Korean Hydrogen and New Energy Society (한국수소및신에너지학회)
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The Study of Heat Transfer on a Isothermal Circular Surface by an Impinging, Circular Water Jets with the Low Velocity Against the Direction of Gravity

중력방향과 대향류인 저속 원형노즐제트 충돌에 의한 일정 두께 하향 등온원형평판에서의 열전달 현상

  • Eom, Yongkyoon (Department of Mechanical Engineering, Andong National Univ.)
  • 엄용균 (안동대학교 기계공학과)
  • Received : 2014.07.16
  • Accepted : 2014.08.31
  • Published : 2014.08.30
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Abstract

The heat transfer phenomenon was investigated in this study when a single round water jet with the low velocity and against the direction of gravity flows to the downward facing Isothermal of definite thickness circular plate. Experimental investigation is performed for a single round jet diameter 4mm, 6mm, and 8mm with the jet velocity 2.4m/s and jet fluid temperature of $24^{\circ}C$, varied the ratio of nozzle clearance/nozzle diameter (H/D)1, 2, 3, 6, and 8, on circular plate isothermal condition with $85^{\circ}C$. The local convection heat transfer coefficient distributions are analyzed based on the visualization of jet flow field. The effects of the diameter of Nozzle, the ratio of H/D and the ratio of nozzle diameter/circular plate diameter on heat transfer phenomenon are investigated. As a results of experiment is obtained correlation equation, $Nu_r=3.18Re_r^{0.55}Pr_r^{0.4}$.

Keywords

Acknowledgement

Supported by : 안동대학교

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