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PREDICTION OF THERMAL RADIATIVE PROPERTIES IN POROUS MEDIA: A MONTE-CARLO RAY TRACING METHOD

DOI: 10.1615/ICHMT.2010.RAD-6.530
pages 56-58

Julien Yves Rolland
CEMHTI - CNRS UPR 3079 1D Avenue de la Recherche Scientifique 45071 Orléans, France

Benoit Rousseau
CEMHTI - CNRS UPR 3079 1D Avenue de la Recherche Scientifique 45071 Orléans, France

Jerome Vicente
lnstitut Universitaire des Systemes Thermiques Industriels (IUSTI-CNRS-UMR 6595), Aix-Marseille Universite Technopole de Chateau-Gombert

Resumo

Knowledge of the thermal radiative properties of materials involved in industrial systems is crucial for dealing with energy balance. The evolution of computer performances opens today new perspectives in the development of predictive code aiming to accurately compute the radiative properties of a given industrial material from its 3D numerical image. In the other hand, predictive approaches appear insightful when experimental measurements cannot be easily performed (high pressure, high temperature, corrosive atmosphere, irradiative exposure…). In this work, a numerical tool has been implemented to reproduce the normal spectral emittance of porous media that can be measured by infrared emittance spectroscopy (3003000 K). The code takes into account the chemical composition and the 3D numerical image of the heated sample. In particular, x-ray μ-tomography is used to provide such images. Then, from the analysis of the sample texture, a Monte Carlo ray tracing scheme is applied for the retrieval of the radiative properties. In this work, we discuss of this procedure and its use for the characterization of aluminium foam (ERG Al 20).

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