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ENCIT 2020
18th Brazilian Congress of Thermal Sciences and Engineering
COMPARATIVE STUDY OF GAS MIXTURE METHODS FOR THE SLW AND WSGG MODELS IN HOMOGENEOUS NON-ISOTHERMAL MEDIA
Submission Author:
Luís Gustavo Pires Rodrigues , RS , Brazil
Co-Authors:
Luís Gustavo Pires Rodrigues, Francis França
Presenter: Luís Gustavo Pires Rodrigues
doi://10.26678/ABCM.ENCIT2020.CIT20-0509
Abstract
This study presents a comparison between several different approaches to dealing with CO2 and H2O mixtures in 1D radiation problems. The WSGG and SLW spectral models were considered. The WSGG model for constant partial pressure ratio mixtures correlations and for individual species correlations was compared with SLW multiple integration, multiplication and with a generated ALBDF function for the gas mixture. Models accuracy was evaluated comparing solutions against the benchmark LBL integration. Homogeneous and isothermal, and homogeneous and non-isothermal media were considered. Results for the radiative heat flux and radiative heat source showed that the SLW with the ALBDF for mixture, the most accurate approach for uniform media, is still competitive in non-isothermal computations. The SLW multiplication approach gave the most reliable results combining computational efficiency and accuracy. Both WSGG approaches gave intermediate results while the SLW multiple integration approach proved itself to be the less recommendable choice to deal with participating gas mixtures in radiation computations.
Keywords
SLW Model, ALBDF function, WSGG model, thermal radiation, spectral modeling
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