Transactions of the Korean Society of Mechanical Engineers B (대한기계학회논문집B)

The Korean Society of Mechanical Engineers (대한기계학회)
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Jet Impingement Heat Transfer on a Cylindrical Pedestal Encountered in Chip Cooling

충돌제트를 이용한 Pedestal 형상의 칩 냉각연구

  • 이대희 (인제대학교 기계자동차공학부) ;
  • 이준식 (서울대학교 기계항공공학부) ;
  • 정영석 (서울대학교 대학원 기계항공공학부) ;
  • 정승훈 (인제대학교 대학원 기계공학과)
  • Published : 2003.01.01
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Abstract

The heat transfer and flow measurements on a cylindrical pedestal mounted on a flat surface with a turbulent impinging jet were made. The experiments were made for the jet Reynolds number of Re = 23,000, the dimensionless nozzle-to-surface distance of L/d = 2~10, the dimensionless pedestal height of H/D = 0~1.5. Measurements of the surface temperature and the Nusselt number distributions on the plate surface were made using liquid crystal and shroud-transient technique. Flow measurements involve smoke flow visualization and the wall pressure coefficient. The results show that the wall pressure coefficient sharply decreases along the upper surface of the pedestal. However, the pressure increases when the fluid escapes from the pedestal and then collides on the plate surface. The secondary maxima in the Nusselt numbers occur in the region of 1.0 $\leq$ r/d $\leq$ 1.9. Their values for the case of H/D = 0.5 are maximum 80% higher than those for other cases. The formation of the secondary maxima may be attributed to the reattachment of flow on the plate surface which was separated at the edge of the pedestal.

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References

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