Transactions of the Korean Society of Mechanical Engineers B (대한기계학회논문집B)

The Korean Society of Mechanical Engineers (대한기계학회)
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Effect of Water Temperature on Heat Transfer Characteristic of Spray Cooling on Hot Steel Plate

냉각수온 효과에 따른 고온 강판의 스프레이 냉각 열전달 특성 연구

  • Lee, Jung-Ho (Dept. of Thermal Systems, Korea Institute of Machinery and Materials) ;
  • Yu, Cheong-Hwan (Division of Home Appliance, LG Electronics Co.) ;
  • Park, Sang-Jin (Dept. of Thermal Systems, Korea Institute of Machinery and Materials)
  • 이정호 (한국기계연구원 열유체시스템연구) ;
  • 유청환 (LG 전자 HA 사업본부) ;
  • 박상진 (한국기계연구원 열유체시스템연구)
  • Received : 2010.05.26
  • Accepted : 2011.02.20
  • Published : 2011.05.01
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Abstract

Water spray cooling is a significant technology for cooling of materials from high-temperature up to $900^{\circ}C$. The effects of cooling water temperature on spray cooling are mainly provided for hot steel plate cooling applications in this study. The heat flux measurements are introduced by a novel experimental technique that has a function of heat flux gauge in which test block assemblies are used to measure the heat flux distribution on the surface. The spray is produced by a fullcone nozzle and experiments are performed at fixed water impact density of G and fixed nozzle-totarget spacing. The results show that effects of water temperature on forced boiling heat transfer characteristics are presented for five different water temperatures between 5 to $45^{\circ}C$. The local heat flux curves and heat transfer coefficients are also provided to a benchmark data for the actual spray cooling of hot steel plate cooling applications.

수분류 스프레이 냉각은 $900^{\circ}C$ 이상의 고온에서 강판을 냉각하는데 매우 중요한 기술이다. 본 연구는 냉각수온이 고온 강판의 수분류 스프레이 냉각에 미치는 영향을 고찰하였다. 이 때의 열유속은 시편, 카트리지히터, 열전대의 조합으로 고안된 열유속게이지를 제작하여 엄밀하게 측정되었다. 스프레이는 fullcone 노즐로부터 생성되고 냉각실험은 일정한 스프레이 질량유속과 노즐과 표면 사이의 거리 조건에서 수행되었다. 냉각수온의 효과는 $5^{\circ}C$에서 $45^{\circ}C$까지 다섯 가지의 서로 다른 수온에 대한 수분류 스프레이 냉각의 열전달 현상을 비교 및 평가하였다. 여기서 열유속곡선과 열전달계수는 고온 강판의 냉각공정에서 실제 스프레이 냉각을 위한 기본 데이터로 활용될 수 있다.

Keywords

References

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