A Numerical Study of the Influence of Temperature Fluctuations in the Thermal Radiation Field

Author

Dos Santos, E.D. ; Galarça, M.M. ; Mossi, A.C. ; Petry, A.P. ; França, F. H R

Author_Institution

Dept. of Mech. Eng., Univ. Fed. do Rio Grande do Sul (UFRGS), Porto Alegre, Brazil

fYear

2009

fDate

23-25 Nov. 2009

Firstpage

31

Lastpage

36

Abstract

The present paper performs a numerical study of the influence of fluctuations on the temperature field over the thermal radiation field with the purpose to simulate the effect of Turbulence-Radiation Interactions (TRI). To evaluate the behaviour of the divergence of radiative heat flux for a flame in a cylindrical cavity, four temperature profiles are imposed: an average temperature profile and other three with 10%, 20% and 30% of turbulence intensity. The radiative transfer equation is solved using the discrete ordinates method (DOM) and the participating medium is treated as a gray gas. The results achieved demonstrate that the fluctuations of temperature profiles increase significantly the mean divergence of the radiative heat flux in comparison with the average temperature profile, reaching to approximately 20% for the profile with 30% of turbulence intensity.

Keywords

flames; heat radiation; radiative transfer; turbulence; cylindrical cavity; discrete ordinates method; flame; gray gas; mean divergence; radiative heat flux; radiative transfer equation; temperature fluctuations; temperature profile; thermal radiation field; turbulence intensity; turbulence-radiation interactions; Equations; Fires; Fluctuations; Heat transfer; Mathematical model; Predictive models; Temperature; Cylindrical cavity; Discrete Ordinates Method; Participant medium; Turbulence-radiation interactions;

fLanguage

English

Publisher

ieee

Conference_Titel

Computational Modeling (MCSUL), 2009 Third Southern Conference on

Conference_Location

Rio Grande

Print_ISBN

978-1-4244-5980-3

Type

conf

DOI

10.1109/MCSUL.2009.12

Filename

5597992