Article ID Journal Published Year Pages File Type
11006640 Journal of Quantitative Spectroscopy and Radiative Transfer 2018 18 Pages PDF
Abstract
Gray gas emissivities of water vapor, carbon dioxide, and carbon monoxide are needed in many engineering calculations to determine radiative heat fluxes in high-temperature processes. In this work we provide (a) an EXCEL program (see Supplementary Material) that predicts total gas emissivities for H2O-CO2-CO-N2 mixtures and (b) a set of graphs for calculations by hand (see Appendix). The EXCEL program uses pre-calculated emissivity charts and overlap correction charts to interpolate the total emissivity for given compositions, temperatures, and pressures. The interpolated emissivities differ by −0.15%±0.73% on average if compared to spectral line-by-line calculations using HITEMP-2010 spectroscopic database. Differences in case of the well-known Hottel's emissivity charts are larger than 200%, particularly at high pressures. Emissivities calculated using Leckner's polynomials may differ from the line-by-line calculated values by −90%-180%.
Related Topics
Physical Sciences and Engineering Chemistry Spectroscopy
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