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Advances in Turbulence IV pp 149–154Cite as

Breakdown of the Reynolds Analogy over Drag-Reducing Riblets Surface

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Part of the book series: Fluid Mechanics and its Applications ((FMIA,volume 18))

Abstract

An experiment was carried out in a low-speed wind tunnel to study the near-wall turbulence structure over a heated riblets surface. The results confirmed the main conclusion of previous study that riblets can enhance the convective heat-transfer rate by as much as 35 percent even within the drag- reducing region. The logarithmic profile of the mean temperature was shifted downwards, indicating that viscous-sublayer thickness of the thermal boundary layer was reduced over a riblets surface. The reason for the apparent breakdown of the Reynolds analogy seems to be related to the difference in the turbulence length scale between the thermal and momentum boundary layers in the& near-wall region.

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References

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Author information

Authors and Affiliations

  1. Department of Mechanical Engineering, The University of Nottingham, University Park, Nottingham, NG7 2RD, UK

    K.-S. Choi

Authors
  1. K.-S. Choi
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Editor information

Editors and Affiliations

  1. Laboratory for Aero- and Hydromechanics, Technical University of Delft, The Netherlands

    F. T. M. Nieuwstadt

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© 1993 Springer Science+Business Media Dordrecht

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Choi, KS. (1993). Breakdown of the Reynolds Analogy over Drag-Reducing Riblets Surface. In: Nieuwstadt, F.T.M. (eds) Advances in Turbulence IV. Fluid Mechanics and its Applications, vol 18. Springer, Dordrecht. https://doi.org/10.1007/978-94-011-1689-3_25

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  • DOI: https://doi.org/10.1007/978-94-011-1689-3_25

  • Publisher Name: Springer, Dordrecht

  • Print ISBN: 978-94-010-4739-5

  • Online ISBN: 978-94-011-1689-3

  • eBook Packages: Springer Book Archive

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