WSGG correlations based on HITEMP2010 for computation of thermal radiation in non-isothermal, non-homogeneous H2O/CO2 mixtures

In this study, new coefficients for the weighted-sum-of-gray-gas (WSGG) model are proposed based on the up-to-date HITEMP2010 database. The coefficients are determined for gas mixtures of water vapor and carbon dioxide with partial pressure (or molar concentration) ratios equal to 1.0 and 2.0, representing typical products of the combustion of fuel oil and methane. The correlations are valid for pressure path-lengths ranging from 0.001 atm m to 10 atm m, and for temperatures varying between 400 K and 2500 K. The WSGG model with the new coefficients are applied to the solution of the radiation heat transfer in non-isothermal, non-homogeneous gas mixtures, which are then compared with benchmark line-by-line solutions to access the accuracy of the model for a few illustrative test cases. Results show that, in spite of its simplicity in comparison to modern gas models, the WSGG model is still a competitive alternative to provide fast but reliable solutions of radiation heat transfer in non-uniform media.