설비공학논문집 (Korean Journal of Air-Conditioning and Refrigeration Engineering)

  • 제17권8호
  • /
  • Pages.714-721
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  • 2005
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  • 1229-6422(pISSN)
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  • 2465-7611(eISSN)
대한설비공학회 (The Society of Air-Conditioning and Refrigerating Engineers of Korea)
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액체 충돌제트의 표면조도변화에 따른 이상유동 열전달 특성

Effect of Surface Roughness on Two-Phase Flow Heat Transfer by Confined Liquid Impinging Jet

  • 임성환 (연세대학교 대학원 기계공학과) ;
  • 신창환 (연세대학교 대학원 기계공학과) ;
  • 조형희 (연세대학교 기계공학과)
  • Yim, Seong-Hwan (Graduate School of Mechanical Engineering, Yonsei University) ;
  • Shin, Chang-Hwan (Graduate School of Mechanical Engineering, Yonsei University) ;
  • Cho, Hyung-Hee (School of Mechanical Engineering, Yonsei University)
  • 발행 : 2005.08.01
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초록

The water jet impingement cooling with boiling is one of the techniques to remove heat from high heat flux equipments. The configuration of surface roughness is one obvious condition of affecting the performance on heat transfer in nucleate boiling, The present study investigates the water jet impinging single-phase convection and nucleate boiling heat transfer for the effect of surface roughness to enhance the heat transfer in free surface and submerged jet. The distributions of the averaged wall temperature as well as the boiling curves are discussed. Jet velocities are varied from 0.65 to 1.7 m/s. Surface roughness by sand blast and sand paper varies from 0.3 to 2.51 ${\mu}m$ and cavity shapes on surface are semi-circle and v-shape, respectively The results showed that higher velocity of the jet caused the boiling incipience to be delayed more. The incipient boiling and heat transfer increase with increasing surface roughness due to a large number of cavities of uniform size.

키워드

참고문헌

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