THE PARAMETERS OF RADIATIVE-CONDUCTIVE HEAT-TRANSFER UNDER CONDITIONSOF HIGH THERMAL-CONDUCTIVITY - THE EFFECT OF SCATTERING AND BOUNDARY-CONDITIONS

The effect of the boundary conditions and radiation scattering on the radiation-conduction parameters is investigated. A generalized radiati on-conduction parameter is proposed, which serves as the criterion of the conditions of high thermal conductivity in both nonscattering and scattering media with the optical thickness indefinitely varying in th e spectral range and with arbitrary (including semitransparent radiati on-absorbing) boundaries. Special conditions of radiative-conductive h eat transfer have been revealed, under which the radiation effect is o f the second order of smallness (rather than of the first, as is usual ly the case) with asymptotic expansion in the small radiation-conducti on parameter.