Enhanced heat transfer and shear stress due to high freestream turbulence

Karen Ann Thole, D. G. Bogard

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

    1 Scopus citations

    Abstract

    Surface heat transfer and skin friction enhancements, as a result of freestream turbulence levels between 10% < Tu < 20%, have been measured and compared in terms of correlations given throughout the literature. The results indicate that for this range of turbulence levels, the skin friction and heat transfer enhancements scale best using parameters which are a function of turbulence level and dissipation length scale. However, as turbulence levels approach Tu = 20%, the SC parameter becomes more applicable and simpler to apply. As indicated by the measured ruts velocity profiles, the maximum streamwise rms value in the near-wall region, which is needed for Sr, is the same as that measured in the freestream at Tu = 20%. Analogous to se, a new parameter, Cl, was found to scale the skin friction data. Independent of all the correlations evaluated, the available data show that the heat transfer enhancement is greater than enhancements of skin friction with increasing turbulence levels. At turbulence levels above Tu = 10%, the freestream turbulence starts to penetrate the boundary layer and inactive motions begin replacing shear-stress producing motions that are associated with the fluid/wall interaction. Although inactive motions do not contribute to the shear stress, theie motions are still active in removing heat.

    Original languageEnglish (US)
    Title of host publicationHeat Transfer; Electric Power; Industrial and Cogeneration
    PublisherAmerican Society of Mechanical Engineers (ASME)
    Volume4
    ISBN (Electronic)9780791878866
    DOIs
    StatePublished - 1994
    EventASME 1994 International Gas Turbine and Aeroengine Congress and Exposition, GT 1994 - The Hague, Netherlands
    Duration: Jun 13 1994Jun 16 1994

    Other

    OtherASME 1994 International Gas Turbine and Aeroengine Congress and Exposition, GT 1994
    CountryNetherlands
    CityThe Hague
    Period6/13/946/16/94

    All Science Journal Classification (ASJC) codes

    • Engineering(all)

    Fingerprint Dive into the research topics of 'Enhanced heat transfer and shear stress due to high freestream turbulence'. Together they form a unique fingerprint.

    Cite this