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

The Society of Air-Conditioning and Refrigerating Engineers of Korea (대한설비공학회)
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Local Heat Transfer Characteristics in Convective Partial Boiling by Impingement of Free-Surface/Submerged Circular Water Jets

미세 원형 충돌수제트의 부분 대류비등에 있어서 자유표면/잠입 제트의 국소 열전달 특성

  • 조형희 (연세대학교 기계공학과) ;
  • 우성제 (연세대학교 대학원 기계공학과) ;
  • 신창환 (연세대학교 대학원 기계공학과)
  • Published : 2002.06.01
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Abstract

Single-phase convection and partial nucleate boiling in free-surface and submerged jet impingements of subcooled water ejected through a 2-mm-diameter circular pipe nozzle were investigated by local measurements. Effects of jet velocity and nozzle-to-imping-ing surface distance as well as heat flux on distributions of wall temperature and heat transfer coefficients were considered. Incipience of boiling began from far downstream in contrast with the cases of the planar water jets of high Reynolds numbers. Heat flux increase and velocity decrease reduced the temperature difference between stagnation and far downstream regions with the increasing influence of boiling in partial boiling regime. The chance in nozzle-to-impinging surface distance from H/d=1 to 12 had a significant effect on heat transfer around the stagnation point of the submerged jet, but not for the free-surface jet. The submerged jet provided the lower cooling performance than the free-surface jet due to the entrainment of the pool fluid of which temperature increased.

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References

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