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Journal of Enhanced Heat Transfer
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ISSN Imprimir: 1065-5131
ISSN En Línea: 1026-5511

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Journal of Enhanced Heat Transfer

DOI: 10.1615/JEnhHeatTransf.v15.i1.50
pages 65-80

Influence of Coatings on Thermal Characteristics and Optimum Sizes of Fins

Valery Gorobets
Institute of Engineering Thermophysics, National Academy of Sciences of Ukraine, 2a Zhelyabov St., 03057, Kiev, Ukraine

SINOPSIS

The influence of coatings on thermal characteristics of the fins having various shape (longitudinal and circular fins, cylindrical pins) has been investigated. Heat transfer in the simplified and two-dimensional statements of the problem is considered and analytical solutions for the temperature distributions and thermal efficiency of the fins with coatings are obtained. The simplified and two-dimensional solutions for the composite fins are compared and the errors that can appear in a simplified heat transfer model are obtained. The contribution of the top surface to the total heat flux from a composite fin is determined. The condition of the "advantage" for a composite fin is found. The optimum sizes of the longitudinal fins with uniform and nonuniform coatings are determined. It is shown that the optimum sizes of the fins with polluting or protective coating depend on the Biot number of the coating and can considerably differ from the optimum sizes of "clean" fins. The influence of nonuniform pollution on thermal efficiency and optimum sizes of the longitudinal fins is studied. The correction factors for fin efficiency and optimum fin sizes which take into account the nonuniformity of pollution have been calculated.


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