Influence of segregation-diffusion processes on the effective thermal conductivity of porous ceramics

Tatiana Gambaryan*, Efim Ya Litovsky, Michael Shapiro

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

11 Scopus citations

Abstract

A model of heat transfer in porous ceramics in the presence of segregation-surface diffusion mechanism is proposed. The effective thermal conductivities of materials possessing a small amount of spherical or cylindrical pores are calculated, which are shown to generalize the Maxwell formula for conductivities of composite materials. Nondimensional parameters are formulated which govern the relative influence of segregation and diffusion of impurities on the effective conductivity of porous materials. Estimates performed for Arrhenius and McLean surface isotherm formulas show that the segregation-diffusion mechanism satisfactorily describes abnormal temperature dependences of thermal conductivities of refractory oxides in vacuum.

Original languageEnglish
Pages (from-to)4123-4131
Number of pages9
JournalInternational Journal of Heat and Mass Transfer
Volume36
Issue number17
DOIs
StatePublished - Nov 1993
Externally publishedYes

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