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ISSN Online: 2377-424X

ISBN Print: 978-1-56700-421-2

International Heat Transfer Conference 15
August, 10-15, 2014, Kyoto, Japan

Identification of the Radiative Properties of α-SiC Foams Realistically Designed With a Numerical Generator

Get access (open in a dialog) DOI: 10.1615/IHTC15.pmd.009191
pages 6565-6578

要約

A numerical foam generation method is employed to design open-cell foams with prescribed and realistic textural features (porosity, volumetric surface, pore size distribution, 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 to respect the cell connectivity really observed on samples elaborated with the foam replication method, and their positions are then randomly perturbed. A Fast- Marching technique coupled to a Watershed algorithm permits the growth and the segmentation of the pores. The strut shape is finally controlled by a thickness growth method. For a given numerical foam, a numerical tool, iMorph, provides afterwards an accurate knowledge of the whole set of textural parameters. Homogenized extinction coefficient of the 3D-reconstructed foams can then be identified by the Radiative Distribution Function Identification method (RDFI) insofar as they comply with a Beerian behavior. In the following, the extinction coefficient 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 pore nominal diameter and the porosity on other hand can be found. Comparisons with previous relationships often used to model heat and mass transfer in high temperature industrial applications such as for Concentrated Solar Power plants, are also proposed.