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Effects of Nozzle Size and Height of Aluminum Foam Heat Sink on Jet Impingement Heat Transfer

충돌제트 열전달에 발포알루미늄 방열기의 높이와 노즐의 크기가 미치는 영향

  • Kim, Seo-Yeong (Thermal Flow Control Research Center, Korea Institute od Science and Technology ) ;
  • Baek, Jin-Uk (Thermal Flow Control Research Center, Korea Institute od Science and Technology ) ;
  • Gang, Byeong-Ha
  • Published : 2001.09.01

Abstract

An experimental study is carried out for an aluminum foam heat sink attached to an isolated heat source to evaluate high potential of aluminum foam as a heat sink with impinging jets. The effects of the pore density and the height of the aluminum foam heat sink, the jet Reynolds number, and the nozzle diameter are delineated in comparison with a conventional pin type heat sink. It is found that the aluminum foam with small pores is inefficient for the heat transfer enhancement due to the large flow friction at the given porosity. In the parameter ranges of the present study, the change in the nozzle diameter shows no significant effects on the surface temperature of the aluminum foam heat sink at a given Reynolds number. The heat transfer enhancement is strongly dependent on the jet Reynolds number and shows a maximum value at a moderate Reynolds number.

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