노즐형상에 따른 돌출 발열블록표면에서의 충돌분류 열전달 특성

Effect of nozzle geometry on the jet impingement heat transfer characteristics at protruding heated blocks

  • 정인기 (영남대학교 기계공학부, 기계기술연구소) ;
  • 박시우 (영남대학교 대학원)
  • 발행 : 2000.11.02

초록

An experimental investigation on heat transfer characteristics of two-dimensional heated blocks using a confined impinging slot jet has been performed. At p/w=1, the effects of jet Reynolds number($Re=3900{\sim}12000$), dimensionless nozzle to block distance(H/B=1, 2, 4, 6) and nozzle type have been examined with five isothermally heated blocks. With the measurement of jet mean velocity and turbulence intensity distributions at nozzle exit, initially turbulent regimes, are classified. To clarify local heat transfer characteristics, naphthalene sublimation technique were used. The local and average heat transfer of heated blocks increase with the sharp-edged nozzle and increasing jet Reynolds number.

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