Journal of Power System Engineering (동력기계공학회지)

The Korean Society for Power System Engineering (한국동력기계공학회)
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Effect of Divergence Ratio on Heat Transfer and Friction Factor in the Diverging Channel

확대 채널에서 확대율이 열전달과 마찰계수에 미치는 효과

  • Oh, Se-Kyung (Dpt. of Mechanical & System Engineering, Institute of Marine Industry, Gyeongsang National University) ;
  • Lee, Myung-Sung (Dpt. of Mechanical & System Engineering, Graduate School, Gyeongsang National University) ;
  • Jeong, Seong-Soo (Dpt. of Mechanical & System Engineering, Graduate School, Gyeongsang National University) ;
  • Ahn, Soo-Whan (Dpt. of Mechanical & System Engineering, Institute of Marine Industry, Gyeongsang National University)
  • 오세경 (경상대학교 해양산업연구소 기계시스템공학과) ;
  • 이명성 (경상대학교 대학원 기계시스템공학과) ;
  • 정성수 (경상대학교 대학원 기계시스템공학과) ;
  • 안수환 (경상대학교 해양산업연구소 기계시스템공학과)
  • Received : 2012.08.03
  • Accepted : 2012.10.23
  • Published : 2013.02.28
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Abstract

The heat transfer and friction factor characteristics of turbulent flows in three stationary channels have been investigated experimentally to check out the effect of divergence ratio. These are a constant cross-sectional channel and two diverging channels with ratio of divergence(Dho/Dhi) of 1.16 and 1.49. The measurement was conducted within the range of Reynolds numbers from 15,000 to 89,000 and the dimension of uniform cross-sectional test section is $100mm{\times}100mm$ at the cross section and 1,000 mm in length. The measurements of heat transfer coefficients and friction factors in the uniform channels were conducted as a reference. Because of the streamwise flow deceleration, the heat transfer and friction factor characteristics in the diverging channel were quite different from those of the constant cross-sectional channel. The effective friction factors and convective heat transfer coefficients increased with increasing the ratio of divergence of the channel.

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References

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