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Journal of Porous Media
インパクトファクター: 1.49 5年インパクトファクター: 1.159 SJR: 0.43 SNIP: 0.671 CiteScore™: 1.58

ISSN 印刷: 1091-028X
ISSN オンライン: 1934-0508

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Journal of Porous Media

DOI: 10.1615/JPorMedia.2015012283
pages 1031-1045

EVOLUTION OF THE HOMOGENIZED VOLUMETRIC RADIATIVE PROPERTIES OF A FAMILY OF α-SiC FOAMS WITH GROWING NOMINAL PORE DIAMETER

Simon Guevelou
UMR CNRS 6607 Laboratoire de Thermocinetique de Nantes
Benoit Rousseau
PRES LUNAM, CNRS, UMR 6607 LTN, Rue Christian Pauc, 44306 Nantes Cedex 3, France
Gilberto Domingues
CNRS, LTeN, UMR 6607, Université de Nantes, Rue Christian Pauc, 44306 Nantes Cedex 3, France
Jerome Vicente
lnstitut Universitaire des Systemes Thermiques Industriels (IUSTI-CNRS-UMR 6595), Aix-Marseille Universite Technopole de Chateau-Gombert
Cyril Caliot
PROMES CNRS, Universite Perpignan Via Domitia - 7, rue du Four Solaire, 66120 Font Romeu Odeillo, France
Gilles Flamant
CNRS PROMES UPR 8521, Tecnosud, Rambla de la Thermodynamique, 66100 Perpignan, France

要約

A numerical foam generation method is employed to design open-cell foams with prescribed and realistic textural features (i.e., porosity, volumetric surface, pore size distribution, and pore−pore distance distribution). The foam generation is initialized by seeding the centers of the pores. Seeds are first regularly distributed following a tetrahedral compact network modeling the real cell connectivity observed in samples elaborated with the foam replication method, and their positions are then randomly perturbed. A fast-marching technique coupled to a watershed algorithm governs the growth and the segmentation of the pores. The strut shape is finally controlled by a thickness growth method. Afterward, for a given numerical foam, a numerical tool (iMorph) provides accurate knowledge of the whole set of textural parameters. The homogenized volumetric radiative properties (i.e., extinction, absorption, and scattering coefficients, denoted by β, α , and γ, respectively) of the reconstructed three-dimensional foams can then be identified by the radiative distribution function identification method insofar as they comply with Beerian behavior. In this study, the radiative properties of a set of numerical α -SiC foams with real textural features are compared at T = 300 K. In particular, a practical relationship between the extinction coefficient on the one hand and the nominal pore diameter at fixed porosity on the other hand may be found. Comparisons with previous relationships often used to model heat and mass transfer in high-temperature industrial applications, such as in concentrated solar power plants, are also proposed. Finally, a generator is used to study the influence of the porosity on the extinction coefficient.