Journal of the Korean Society for Heat Treatment (열처리공학회지)

The Korean Society for Heat Treatment (한국열처리공학회)
권호 표지

Characteristic of Evaporation Cooling in Water Droplet Impinging on Steel with Various Surface Roughness and Droplet Diameter

강에서 표면조도의 변화와 액적 직경에 따른 충돌 액적 증발 냉각 특성

  • Jang, C.S. (School of Mechanical Engineering, Kyungpook National University) ;
  • Sohn, C.H. (School of Mechanical Engineering, Kyungpook National University) ;
  • Chung, S.W. (School of Biosystems Engineering, Pusan National University) ;
  • Choi, W.S. (School of Biosystems Engineering, Pusan National University)
  • 장충선 (경북대학교 기계공학부) ;
  • 손창현 (경북대학교 기계공학부) ;
  • 정성원 (부산대학교 바이오시스템공학부) ;
  • 최원식 (부산대학교 바이오시스템공학부)
  • Received : 2006.04.24
  • Accepted : 2006.05.16
  • Published : 2006.05.30
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Abstract

An experimental study is presented for water droplet impingement on a steel surface in the process of heat treatment. The objective of the present work is to examine characteristic of evaporation cooling due to surface roughness and droplet diameter under conductive heat input condition. The surface temperatures varied from $80{\sim}155^{\circ}C$, surface roughness was from $R_a=0.12{\mu}m$ to $R_a=1.14{\mu}m$ and droplet diameter was from 2.4 mm to 3.0 mm. The results show that the total evaporation time is shorter for the larger surface roughness and the smaller droplet size, the time average heat flux has maximum value for the larger surface roughness and the smaller droplet size. The total evaporation time has not influence on the nuclear boiling region.

Keywords

References

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