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

The Society of Air-Conditioning and Refrigerating Engineers of Korea (대한설비공학회)
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Heat Transfer Enhancement in a Divergent Passage with 30° Inclined Ribs

30° 경사 리브가 있는 확대 채널 통로 내의 열전달 증가

  • Lee, Myung Sung (Evaluation Team, Gyeongnam Institute for Regional Program Evaluation) ;
  • Ahn, Soo Whan (Dpt. of Mechanical and System Engineering, Institute of Marine Industry, Gyeongsang National University)
  • 이명성 (경남지역사업평가단) ;
  • 안수환 (경상대학교 해양산업연구소 기계시스템공학과)
  • Received : 2017.02.09
  • Accepted : 2017.05.26
  • Published : 2017.08.10
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Abstract

The effect of different rib geometries such as V-shaped continuous (case A), parallel broken (case B), and V-shaped broken (case C) ribs on local heat transfer distributions and pressure drops in a divergent channel with $30^{\circ}$ inclined ribs on one wall or two walls was investigated for Reynolds numbers from 22,000 to 75,000. Top and bottom walls were insulated; two side walls were uniformly heated in the divergent channel. Heated walls were composed of 10 isolated coper sections and length-to-outlet hydraulic diameter ratio of 10. Rib height-to-outlet hydraulic diameter ratio was 0.1, and rib pitch-to-height ratio equaled 10. Results revealed that V-shaped continuous rib (case A) produced approximately 1.4 times higher average Nussselt number than in the parallel broken rib (case B), and V-shaped broken rib (case C) in the channel with two ribbed walls at Re = 54,000.

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References

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