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Thermal Conductivity: VIII, A Theory of Thermal Conductivity of Porous Materials
Author(s) -
LOEB ARTHUR L.
Publication year - 1954
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1551-2916.1954.tb20107.x
Subject(s) - thermal conductivity , thermal conduction , materials science , emissivity , porosity , anisotropy , conductivity , composite material , porous medium , optics , chemistry , physics
The effective thermal conductivity of a porous material is due to both conduction and radiation processes. A theory is presented relating the effective conductivity to the conductivity of the solid material, to the emissivity of the surface of the pores, and to the size, shape, and distribution of the pores. By means of an anisotropic distribution and orientation of pores, materials can be prepared having different thermal conductivities in different directions.