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ENCIT 2016
16th Brazilian Congress of Thermal Sciences and Engineering
Analysis of the influence of the spectral dependence of radiative properties of a participating medium in the turbulence-radiative interaction in a non-reacting channel flow
Submission Author:
Francis França , RS , Brazil
Co-Authors:
Guilherme Crivelli Fraga, Adriane Prisco Petry
Presenter: Guilherme Crivelli Fraga
doi://10.26678/ABCM.ENCIT2016.CIT2016-0372
Abstract
The phenomenon of turbulence-radiation interaction (TRI) has been demonstrated experimentally, theoretically and numerically to be important in a great number of engineering applications. This paper presents a numerical study on the subject, focusing on a non-reacting channel flow of participating gases (carbon dioxide and water vapor) and employing computer fluid dynamics. An open source Fortran-based finite volume method code, Fire Dynamics Simulator (FDS), is used for the analysis. The main objective of the present work is to perform a fundamental study on the influence of considering or not the spectral dependence of the radiative properties of a participating medium on the magnitude of TRI effects. Large Eddy Simulation (LES) is adopted to model turbulence, and to resolve the sub-grid scale terms the dynamic Smagorinsky model is used. To model the inclusion or not of the spectral variation of radiative properties in the solution, the weighted-sum-of-gray-gases (WSGG) and the gray gas (GG) models are implemented, respectively. Comparing the differences between results for the wall heat fluxes and the volumetric radiative heat source obtained from solutions considering and neglecting the TRI effects, the phenomenon is shown not to be significant in the problem studied, which agrees with previous studies on non-reacting flows. Nevertheless, an evident influence on the turbulence-radiation interaction magnitude is observed when the spectral variation of radiation properties is included in the solution of radiative heat transfer; however, this influence can be positive, contributing to increase the TRI effects when compared to the results for a gray medium, or negative, decreasing the effects of the phenomenon, depending on the problem that is analyzed.
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