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ISSN Online: 2377-424X

ISBN Print: 0-89116-130-9

International Heat Transfer Conference 6
August, 7-11, 1978, Toronto, Canada

NUMERICAL METHODS FOR SOLUTION OF RADIATIVE-CONVECTIVE HEAT TRANSFER PROBLEMS. RADIATIVE BOUNDARY LAYER

Get access (open in a dialog) DOI: 10.1615/IHTC6.4280
pages 397-401

Sinopsis

New techniques of radiative-convective heat transfer calculation are proposed which allow one to solve problems for any optical thickness of a radiating volume. The application of these techniques significantly reduces the required computer time as compared to that demanded by other techniques. Comparison of the results obtained with those by exact calculation has shown that for the case of radiating layer being optically thick the radiant thermal conductivity approximation allows one not only to describe correctly the structure of the flow but also to determine radiation flux with an error not exceeding 10 per cent. In this case heat transfer by radiation leads to formation of temperature boundary layer near volume boundary. Analyses of numerical calculation has permitted to establish simple relations for radiation flux on the surface. Plow regimes are shown to exist where radiation mean free path exceeds the thickness of the boundary layer. In this case thermal conductivity approximation is found to be invalid, the accuracy of relation is deteriorated and solving the problem would involve the employment of general radiative transfer equations.