Eventos Anais de eventos
COBEM 2017
24th ABCM International Congress of Mechanical Engineering
Application of the weighted-sum-of-gray-gases model to non-homogeneous H2O/CO2 mixtures for media with non-gray walls
Submission Author:
Francis França , RS , Brazil
Co-Authors:
Roberta Juliana Collet da Fonseca, Francis França
Presenter: Francis França
doi://10.26678/ABCM.COBEM2017.COB17-0857
Abstract
The spectral modeling of the thermal radiation in participating media is a research area that has received constant attention due to its importance in a great number of engineering problems, especially because the highly irregular spectral dependence of the absorption coefficient of a gas with the wavenumber requires the adoption of alternative methods to determine the radiative properties. This work brings a numerical study of a one-dimensional system, bounded by perfectly diffuse and non-gray walls, filled by a non-homogeneous, non-isothermal mixture of carbon dioxide and water vapor. The main objective is to estimate the magnitude of the deviations in treating surfaces that should be considered non-gray as black or gray. The spectral modeling of the problem is performed by the weighted-sum-of-gray-gases (WSGG) model and the accuracy of the methodology developed is evaluated by means of comparisons against the results obtained by line-by-line (LBL) integration.
Keywords
thermal radiation, weighted-sum-of-gray-gases model, line-by-line integration, non-gray surfaces
