Thermal conductivity of porous materials

Abstract : Incorporation of porosity into a monolithic material decreases the effective thermal conductivity. Porous ceramics were prepared by different methods to achieve pore volume fractions from 4 to 95%. A toolbox of analytical relations is proposed to describe the effective thermal conductivity as a function of solid phase thermal conductivity, pore thermal conductivity, and pore volume fraction (νp). For νp < 0.65, the Maxwell–Eucken relation for closed porosity and Landauer relation for open porosity give good agreement to experimental data on tin oxide, alumina, and zirconia ceramics. For νp > 0.65, the thermal conductivity of kaolin-based foams and calcium aluminate foams was well described by the Hashin Shtrikman upper bound and Russell’s relation. Finally, numerical simulation on artificially generated microstructures yields accurate predictions of thermal conductivity when fine detail of the spatial distribution of the phases needs to be accounted for, as demonstrated with a bio-aggregate material.
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https://hal-unilim.archives-ouvertes.fr/hal-01115971
Contributeur : Fabrice Rossignol <>
Soumis le : jeudi 12 février 2015 - 11:23:53
Dernière modification le : vendredi 9 août 2019 - 14:20:09

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David Stanley Smith, Arnaud Alzina, Julie Bourret, Benoît Nait-Ali, Fabienne Pennec, et al.. Thermal conductivity of porous materials. International Journal of Materials Research, 2013, 28 (17), pp.2260-2272. ⟨10.1557/jmr.2013.179⟩. ⟨hal-01115971⟩

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