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Heat transfer and friction in rectangular channels with ribbed or ribbed-grooved walls.

Author(s) : ZHANG Y. M., GU W. Z., HAN J. C.

Type of article: Article

Summary

The rib-groove roughened wall enhances the heat transfer 3.4 times and pays 6 times the pressure drop penalty, whereas the rib roughened wall, with similar rib height and rib spacing, enhances the heat transfer 2.4 times and pays about the same pressure drop penalty. Semi-empirical friction and heat transfer correlations were obtained. Flow measurements show that the roughened ducts have flatter velocity profiles than the smooth duct and rib-groove roughened duct produces higher turbulence intensity than the rib roughened duct. The flatter velocity profile and higher turbulence intensity are responsible for producing higher heat transfer.

Details

  • Original title: Heat transfer and friction in rectangular channels with ribbed or ribbed-grooved walls.
  • Record ID : 1995-0823
  • Languages: English
  • Source: J. Heat Transf. - vol. 116 - n. 1
  • Publication date: 1994/02
  • Document available for consultation in the library of the IIR headquarters only.

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