THE SPECTRAL LINE-BASED WEIGHTED-SUM-OF-GRAY-GASES MODEL IN NONISOTHERMAL NONHOMOGENEOUS MEDIA

An approach is developed to extend the previously developed spectral-l ine weighted-sum-of-gray-gases (SLW) model to nonisothermal, nonhomoge neous media. The distinguishing feature of the SLW gas property model is that it has been developed for use in arbitrary solution methods of the radiative transfer equation (RTE). A spatial dependence of the gr ay gas absorption cross sections on local temperature, pressure, and m ole fraction is introduced through the absorption-line blackbody distr ibution function: Incorporating this spatial dependence results in sig nificant improvement over the use of spatially uniform gray gas absorp tion cross sections in comparisons with line-byline benchmarks.