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Assessment of geometrical and transport properties of a fibrous C/C composite preform as digitized by x-ray computerized microtomography: Part II. Heat and gas transport properties

Published online by Cambridge University Press:  31 January 2011

Gerard L. Vignoles ,
Olivia Coindreau ,
Azita Ahmadi  and
Dominique Bernard
Gerard L. Vignoles*
Affiliation:
Université Bordeaux 1, Laboratoire des Composites ThermoStructuraux (LCTS) 3, Allée La Boëtie, F33600 Pessac, France
Olivia Coindreau
Affiliation:
Université Bordeaux 1, Laboratoire des Composites ThermoStructuraux (LCTS) 3, Allée La Boëtie, F33600 Pessac, France
Azita Ahmadi
Affiliation:
Université Bordeaux 1, Transport, Ecoulements Fluides, Energétique (TREFLE), Esplanade des Arts et Métiers, F33405 Talence, France
Dominique Bernard
Affiliation:
Centre National de la Recherche Scientifique (CNRS), Institut de Chimie de la Matière Condensée de Bordeaux (ICMCB), 26 Avenue du Dr. Schweitzer, F33608 Pessac Cedex, France
*
a)Address all correspondence to this author. e-mail: vinhola@lcts.u-bordeaux1.fr
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Abstract

Raw and partially infiltrated carbon–carbon composite preforms have been scanned by high-resolution synchrotron radiation x-ray computerized microtomography. Three-dimensional high-quality images of the pore space have been produced at two distinct resolutions and have been used for the computation of transport properties: heat conductivity, binary gas diffusivities, Knudsen diffusivities, and viscous flow permeabilities. The computation procedures are based on a double change-of-scale strategy suited to the bimodal nature of pore space and on the local determination of transport anisotropy. Good agreement has been found between all calculated quantities and experimental data.

Keywords

DiffusionThermal conductivityX-ray tomography

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Articles
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Journal of Materials Research , Volume 22 , Issue 6 , June 2007 , pp. 1537 - 1550
Copyright
Copyright © Materials Research Society2007

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References

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