Comparison of REM2 with LBL analysis and gas model for one dimensional radiative heat transfer

One-dimensional radiative heat transfer in inhomogeneous, non-gray and anisotropically scattering participating media for gas phase was investigated by using Radiation Element Method by Ray Emission Model (REM2) in this paper. The spectral dependence of the absorption coefficient on wavelength is appropriately accounted for by solving the radiative transfer equation for one-dimensional parallel plates. Results by line-by-line (LBL) analysis and by gas model were compared for some gas mixtures at uniform and non-uniform temperature profiles. Accuracy of both analyses was estimated. It was found that the LBL analysis had higher accuracy than the gas model at the same spatial discretion in the case of uniform temperature profiles In the case of non-uniform temperature profiles, differences appeared between the LBL analysis and the gas model. Heat fluxes from REM2 with LBL analysis and from REM2 with gas model were also compared. In the case where the anisotropic scattering is important, the gas model had the same accuracy as the LBL analysis.