Generation of new correlations for the weighted-sum-of-gray-gases model for carbon monoxide
Aline Ziemniczak1; Rogério Brittes1; Felipe Roman Centeno1; Francis Henrique Ramos França1
1 Federal University of Rio Grande do Sul
doi:10.20906/CPS/COB-2015-0755
Resumo
The weighted-sum-of-gray-gases (WSGG) model has been extensively applied to perform the spectral integration of the radiative transfer equation in combustion problems, as an alternative to the highly computational demand of the line-by-line (LBL) integration. In the WSGG model, the nongray gas is replaced by a number of gray gases, for which the heat transfer rates are independently calculated. The parameters for the WSGG model are obtained by fitting total emittance data. In this work, new correlations are obtained for the WSGG model for monoxide carbon (CO) molecules based on the HITEMP 2010 database. The interest in studying the CO molecule is based on some combustion processes where the monoxide of oxygen is found in a significant amount, as biomass gasification technology. The path-length ranges are from 0.0001 atm.m to 10 atm.m, while the temperature varies between 400 K and 2500 K. The WSGG correlations are generated for four gray gases. A one-dimensional medium is solved with the WSGG model for non-isothermal, homogeneous and non-homogeneous conditions. The results show that the WSGG correlations obtained provide accurate results for CO compared with the LBL solution, as it has been observed for H2O and CO2 molecules.
Palavras-chave: absorption coefficient; HITEMP 2010; WSGG model; LBL benchmark solution; CO molecule