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

The Society of Air-Conditioning and Refrigerating Engineers of Korea (대한설비공학회)
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Change of Heat Transfer Characteristics in a Rotating Channel of Square Duct at Wall with Bleed Holes ( I ) - Effects of Rotation Speed -

회전하는 사각덕트 유로에서 벽면 유출홀에 따른 열전달 특성 변화( I ) -회전수 변화에 따른 영향 -

  • Kim Sang In (Graduate School of Mechanical Engineering, Yonsei University) ;
  • Kim Kyung Min (Graduate School of Mechanical Engineering, Yonsei University) ;
  • Lee Dong-Hyun (Graduate School of Mechanical Engineering, Yonsei University) ;
  • Jeon Yun Heung (Graduate School of Mechanical Engineering, Yonsei University) ;
  • Cho Hyung Hee (School of Mechanical Engineering, Yonsei University)
  • 김상인 (연세대학교 기계공학부 대학원) ;
  • 김경민 (연세대학교 기계공학부 대학원) ;
  • 이동현 (연세대학교 기계공학부 대학원) ;
  • 전윤흥 (연세대학교 기계공학부 대학원) ;
  • 조형희 (연세대학교 기계공학부)
  • Published : 2005.10.01
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Abstract

The present study has been conducted to investigate convective heat/mass transfer in the cooling passage with bleed holes. The rotating square channel has 40.0 mm hydraulic diameter and the bleed holes on the leading surface of the channel. The hole diameter of bleed hole is 4.5mm and its spacing is ( p/d:4.9) about five times of hole diameter. Exit mass flow rate through bleed holes is $10\%$ of the main mass flow rate and relation number is changed form 0.0 to 0.4. A naphthalene sublimation technique is employed to determine the detailed local heat transfer coefficients using the heat and mass transfer analogy The cooling performance is influenced by exit mass flow rate through bleed holes and Coriolis force of rotating channel for fixed Reynolds number. The heat transfer on the leading surface is decreased due to Coriolis force. However the total heat transfer is enhanced around holes on the leading surface because of trapping flow by bleeding.

Keywords

References

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