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International Heat Transfer Conference 16

ISSN: 2377-424X (online)
ISSN: 2377-4371 (flashdrive)

COMBINING MICRO- MESO- AND MACRO-SCOPIC NUMERICAL METHODS FOR MULTISCALE RADIATIVE TRANSFER MODELING OF SiC-BASED FOAMS UP TO VERY HIGH TEMPERATURES

M. A. Badri
IRT Jules Verne, Chemin du Chaffault, 44340 Bouguenais, France; CNRS, LTeN, UMR 6607, Université de Nantes, Rue Christian Pauc, 44306 Nantes Cedex 3, France

A. Biallais
Ouest Valorisation, 30 bd Vincent Gache, CS 70211, 44201, Nantes Cedex, France

Gilberto Domingues
CNRS, LTeN, UMR 6607, Université de Nantes, Rue Christian Pauc, 44306 Nantes Cedex 3, France

Y. Favennec
CNRS, LTeN, UMR 6607, Université de Nantes, Rue Christian Pauc, 44306 Nantes Cedex 3, France

G. Fugallo
CNRS, LTeN, UMR 6607, Université de Nantes, Rue Christian Pauc, 44306 Nantes Cedex 3, France

A. Mekeze Monthe
CNRS, LTeN, UMR 6607, Université de Nantes, Rue Christian Pauc, 44306 Nantes Cedex 3, France

Benoit Rousseau
CNRS, LTeN, UMR 6607, Université de Nantes, Rue Christian Pauc, 44306 Nantes Cedex 3, France

DOI: 10.1615/IHTC16.pma.024216
pages 8209-8216


PALABRAS CLAVE: Radiation, Numerical simulation and super-computing, ab initio and atomistic methods, monte carlo ray tracing, vectorial finite element, multiscale, cellular materials

Sinopsis

A general multiscale numerical approach is proposed to finely reproduce, up to 1300 K, the radiative heat transfers within alpha silicon carbide-based open-cell foams, with tuned chemical and textural features. The complete modeling is based on a thorough analysis performed at micro-, meso-, and macro-scopic scales. To gauge, at the microscopic scale, the influence of the electron-phonon coupling on the intrinsic optical properties of silicon carbide, a molecular dynamic method involving a modified Tersoff potential is used. Then, at the mesoscopic scale, with optical indices provided by our molecular dynamic simulations, a collision-based Monte Carlo ray tracing method is used for retrieving the homogenized radiative properties of the selected foams. Finally, at the macroscopic scale, for a set of foams (porosity ~ 0.4 - 0.9), we used our micro-meso constructed radiative properties for calculating the propagation of radiation by solving the radiative transfer equation using the vectorial finite element method. In addition, a fictitious foam constructed using heavily chemical doping at microscopic level, is put forward to change the volumetric propagation of the thermal radiation.

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