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

Tatiana Gambaryan; Efim Ya Litovsky; Michael Shapiro

doi:10.1016/0017-9310(93)90074-G

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 journal › Article › peer-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 language	English
Pages (from-to)	4123-4131
Number of pages	9
Journal	International Journal of Heat and Mass Transfer
Volume	36
Issue number	17
DOIs	https://doi.org/10.1016/0017-9310(93)90074-G
State	Published - Nov 1993
Externally published	Yes

Access to Document

10.1016/0017-9310(93)90074-G

Cite this

@article{308ca2dbb015431289811c0f23930162,

title = "Influence of segregation-diffusion processes on the effective thermal conductivity of porous ceramics",

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.",

author = "Tatiana Gambaryan and Litovsky, {Efim Ya} and Michael Shapiro",

note = "Funding Information: Acknowledgement-This research was supported by the Technion V.P.R. Fund-Israel-Mexico Energv Research Fund and Alexander Goldberg Memorial Research Fund. E. Ya. L. gratefully acknowledges the support of The Wolfson Family Charitable Trust.",

year = "1993",

month = nov,

doi = "10.1016/0017-9310(93)90074-G",

language = "英语",

volume = "36",

pages = "4123--4131",

journal = "International Journal of Heat and Mass Transfer",

issn = "0017-9310",

publisher = "Elsevier Ltd.",

number = "17",

}

TY - JOUR

T1 - Influence of segregation-diffusion processes on the effective thermal conductivity of porous ceramics

AU - Gambaryan, Tatiana

AU - Litovsky, Efim Ya

AU - Shapiro, Michael

N1 - Funding Information: Acknowledgement-This research was supported by the Technion V.P.R. Fund-Israel-Mexico Energv Research Fund and Alexander Goldberg Memorial Research Fund. E. Ya. L. gratefully acknowledges the support of The Wolfson Family Charitable Trust.

PY - 1993/11

Y1 - 1993/11

N2 - 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.

AB - 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.

UR - http://www.scopus.com/inward/record.url?scp=0027697670&partnerID=8YFLogxK

U2 - 10.1016/0017-9310(93)90074-G

DO - 10.1016/0017-9310(93)90074-G

M3 - 文章

AN - SCOPUS:0027697670

SN - 0017-9310

VL - 36

SP - 4123

EP - 4131

JO - International Journal of Heat and Mass Transfer

JF - International Journal of Heat and Mass Transfer

IS - 17

ER -

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

Abstract

Access to Document

Other files and links

Fingerprint

Cite this