Eventos Anais de eventos
COBEM 2019
25th International Congress of Mechanical Engineering
A STUDY OF THE ABSORPTION CROSS-SECTION WITH THE PRESSURE AND CO2 GASES CONCENTRATION IN RADIATIVE TRANSFER CALCULATIONS.
Submission Author:
Gabriel de Lima Bernardino , RN
Co-Authors:
Gabriel de Lima Bernardino, Andre Maurente
Presenter: Anderson Nunes de Sousa
doi://10.26678/ABCM.COBEM2019.COB2019-0146
Abstract
Spectrally dependent properties are important in radiative heat transfer in participating medium. Absorption cross-section is a spectral property that is related with the emission and absorption of radiation by molecular gases. Solution of the radiative heat transfer depends on the absorption coefficient and consequently depends on the absorption cross-section. A study about how the absorption cross-section varies with pressure and with the CO2 concentration will be presented. Nonuniform and non-isothermal medium will be considered in simulations for a layer of one-dimensional medium. This analysis seeks to verify how much the absorption cross-section is sensitive to the CO2 concentration in order to use it how a constant in radiative heat transfer calculations for CO2 nonuniform gases. The results present that the absorption cross-section obtained at 1 atm and 25 % of CO2 can be used as constant with relation to concentration and pressure for nonuniform medium at 3 atm with good accuracy.
Keywords
Absorption cross-section, Spectral properties, pressure, Concentration, radiative transfer equation
