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

The Society of Air-Conditioning and Refrigerating Engineers of Korea (대한설비공학회)
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Numerical Study on Flow and Heat Transfer Enhancement in a Cooling Passage with Protrusion-In-Dimples

돌출부를 포함한 딤플 표면을 가진 냉각 유로에서의 유동과 열전달 성능 향상에 관한 수치적 연구

  • Kim, Jeong-Eun (School of Mechanical Engineering, Pusan National University) ;
  • Ha, Man-Yeong (School of Mechanical Engineering, Pusan National University) ;
  • Yoon, Hyun-Sik (Advanced Ship Engineering Research Center, Pusan National University) ;
  • Doo, Jeong-Hoon (School of Mechanical Engineering, Pusan National University)
  • 김정은 (부산대학교 기계공학부) ;
  • 하만영 (부산대학교 기계공학부) ;
  • 윤현식 (부산대학교 첨단조선공학연구센터) ;
  • 두정훈 (부산대학교 기계공학부)
  • Received : 2011.10.05
  • Published : 2011.12.10
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Abstract

In the present study, the detailed flow structure and heat transfer characteristics in the newly-designed heat transfer surface geometry were investigated. The surface geometry proposed in the present study is a traditional dimple structure combining with a protrusion inside the dimple, which is named a protrusion-in-dimple in this study. The basic idea underlying the present surface geometry is to enhance the flow mixing and the corresponding heat transfer in the flow re-circulating region generated by a conventional dimple cavity. The present study was performed by the direct numerical simulation at a Reynolds number of 2800 based on mean velocity and channel height and Prandtl number of 0.71. Three different protrusion heights for protrusion-in-dimples were considered as the main design parameter of the present study. The calculated pressure drop and heat transfer capacity were assessed in terms of the Fanning friction factor and Colburn j factor. The overall performances estimated in terms of the volume and area goodness factor for protrusion-in-dimple cases were higher than the conventional dimple case.

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References

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