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Microscopic thermal characterization of HTR particle layers

Funded under: FP7-EURATOM


This paper presents thermal diffusivity measurements of HTR fuel particle pyrolytic carbon layers at room temperature. The photoreflectance microscopy (PM) technique is used to characterize particle layers at a microscopic scale. Nevertheless, buffer layer needs a particular analysis due to its porous structure. Indeed, measurements by PM on this material only permit to obtain the thermal diffusivity of the solid skeleton, whose homogeneous zones surface does not exceed 100 micrometer{2}. These characteristics make, on the one hand, delicate the use of PM, and on the other hand, require the use of a numerical homogenization technique. This model takes into account the properties of gas confined in the pores, to simulate the conduction heat flux traveling through the layer in relation with its microstructure and to estimate an effective thermal conductivity of the entire layer. This approach is validated by infrared microscopy measurement of the effective thermal diffusivity of the especially elaborated thicker buffer layer. Last, the first tests to characterize the silicon carbide layer are presented.

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Authors: ROCHAIS D, CEA Le Ripault, Monts (FR);LE MEUR G, CEA Le Ripault, Monts (FR);DOMINGUES G, CEA Le Ripault, Monts (FR);BASINI V, Département de Recherches sur la Fusion Contrôlée, Association Euratom-CEA sur la Fusion, CEA Cadarache, Saint-Paul-lez-Durance (FR)
Bibliographic Reference: An oral paper given at:HTR-2006: 3rd International Topical Meeting on High Temperature Reactor Technology Organised by: North-West University, South Africa Held at: Sandton Sun and Towers, Sandton, Gauteng (SA)
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