Heat transfer in an optically thick horizontal fluid layer heated from below

Fan-bill B. Cheung, J. B. Novas

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    2 Scopus citations

    Abstract

    The process of combined turbulent natural convection and radiation in a bottom-heated, horizontal layer of an optically thick fluid medium, confined between two rigid, parallel, and conducting plates at high temperatures, is studied analytically based upon a simple eddy diffusivity model. The model is developed by a phenomenological approach with special emphasis on the mean temperature structure in the intermediate wall region. It is demonstrated that, when radiation is present in the layer in addition to convection, the temperature field ceases to be symmetric with respect to the center plane. In particular, the upper and the lower thermal boundary layers are shown to be quite different in thickness while the turbulent core temperature is shown to deviate significantly from the value for purely turbulent convection. Calculation of the radiation-enhanced heat flux is made and is found to be in good qualitative agreement with those obtained in related studies.

    Original languageEnglish (US)
    Pages (from-to)171-181
    Number of pages11
    JournalLetters in Heat and Mass Transfer
    Volume7
    Issue number3
    DOIs
    StatePublished - Jan 1 1980

    All Science Journal Classification (ASJC) codes

    • Engineering(all)

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