Calculated net emission coefficients for thermal argon plasma contaminated with iron vapour are presented in this paper. These data were computed using a detailed theoretical analysis that accounts for line emission, free-bound emission, and free-free emission. All important line-broadening mechanisms are included and the effects of emission and absorption on the net emission coefficient are accounted for on a line-by-line basis. Results for iron mole fractions ranging from 0 to 100% are given for a number of different path lengths and plasma temperatures at a plasma pressure of 1 atm. Comparisons to previously published data are also made.

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The S-N discrete ordinates method is applied to analyze radiative heat transfer in nongray gases. Spectral correlation between the terms in the equation of transfer is considered for black or nearly nonreflecting walls. Formulations to apply the S-N method using a narrow-band or the exponential wide-band model are presented. The net radiative wall heat fluxes and the radiative source distributions are obtained for uniform, parabolic, and boundary layer type temperature profiles, as well as for a parabolic concentration profile. The narrow- and wide-band nongray solutions are compared with gray-band approximations using the same band models. The computational speed of the gray-band approximation is obtained at the expense of accuracy in the internal fluxes and radiative source distributions. The wall radiative flux predictions by the gray-band approximation are satisfactory.

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