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

The Korean Society of Mechanical Engineers (대한기계학회)
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Heat Transfer Enhancement by the Perforated Plate of Round Impinging Air Jets

원형충돌제트에서 다공질판에 의한 열전달 향상

  • Kim, Yun-Taek (Department of Mechanical Engineering. Graduate School. Inje University) ;
  • Lee, Yeong-Min (Department of Mechanical Engineering. Graduate School. Inje University) ;
  • Won, Se-Yeol (Department of Mechanical Engineering. Graduate School. Inje University) ;
  • Lee, Dae-Hui
  • Published : 2001.04.01
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Abstract

The purpose of this study is to investigate the heat transfer augmentation using the perforated plate placed in front of a target plate in an axisymmetric impinging air jet system. The new liquid crystal technique using neural networks with median filtering is used to determine the Nusselt number distributions on the target surface. The experiments were made for the jet Reynolds number (Re) 23,000. The effects of the pitch-to-diameter (p/d1) from 1.5 to 2.5 in the perforated plate, the hole diameter on perforated plate (d1) from 4㎜ to 12㎜, the perforated plate to target surface distance (z/d1) from 1 to 3, and the nozzle-to-target surface distance (L/d) from 2 to 10 on the heat transfer characteristics were experimentally investigated. It was found that when the perforated plate was located between the nozzle exit and the target plate, the average heat transfer rate at the stagnation region corresponding to r/d$\leq$1.0 was increased up to the maximum 2.3 times compared to the case without the perforated plate.

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References

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