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Journal of Porous Media
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ISSN Imprimer: 1091-028X
ISSN En ligne: 1934-0508

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Journal of Porous Media

DOI: 10.1615/JPorMedia.v15.i7.40
pages 647-663

MODELING OF HEAT TRANSFER ACROSS POROUS HONEYCOMB STRUCTURES

Dominique Baillis
LaMCoS, INSA-Lyon, CNRS UMR 5259,18-20 Rue des Sciences, F69621 Villeurbanne, France
Remi Coquard
Société "Etude Conseils Calcul Modélisation" (EC2-MODELISATION), 66 Boulevard Niels Bohr, F69603 Villeurbanne, France
M. Thomas
Airbus Operation SAS, 316 Route de Bayonne, 31060 Toulouse, France
B. Estebe
Airbus Operation SAS, 316 Route de Bayonne, 31060 Toulouse, France

RÉSUMÉ

In the framework of the reduction of the weight of airplanes, porous honeycomb structures are increasingly used in the aircraft industry. They notably enter in the composition of the new generation composite fuselages as thermal insulating shields due to interest in combining, at the same time, high thermal insulating properties, low density, and sufficient mechanical resistance. However, their thermal properties remain relatively unexplored and the number of theoretical and experimental studies concerning the heat transfer through honeycomb structures is very limited. Therefore, the present study is interested in the modeling of the complete heat transfer through this type of porous material. Due to their low density, both conductive and radiative heat transfers have to be taken into account while the contribution of convection can be neglected. The coupled heat transfer is solved by a numerical resolution of the combined energy and radiative transfer equations. The equivalent radiative properties of the material are determined using ray-tracing procedures inside the idealized porous structure while the effective conductivity is estimated via simple, but nonetheless, realistic analytical formulas. The accuracy of the developed model is validated by comparing the heat transfer coefficient measured by different authors for various honeycomb structures with the theoretical results. Thereafter, a parametric study is conducted by varying the structural dimensions and physical properties of the constituents. This permits us to evaluate the contributions of radiative and conductive heat transfers and to highlight the parameters that strongly influence the thermal performance of the insulating shield.


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