Effect of (partial) overlapping of spectral lines on the total emissivity of H2O-CO2 mixtures (T⪞800°K)

Abstract The influence of (partial) overlapping of lines in CO 2 -H 2 O mixtures has been calculated. Highly simplified calculations lead to acceptable agreement with Hottel's empirical correlations at elevated temperatures ( T =1200°K) where only the 2·7 μ bands of H 2 O and CO 2 are overlapped. On the other hand, comparisons at 811°K indicate that serious discrepancies exist in the 15 μ region between Hottel's correlations and approximate calculations based on recent spectroscopic measurements.