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Article Dans Une Revue International Journal of Materials Research Année : 2013

Thermal conductivity of porous materials

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Résumé

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.

Domaines

Chimie Matériaux

Dates et versions

hal-01115971 , version 1 (12-02-2015)

Identifiants

Citer

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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