The porosity dependence of thermal conductivity

Kód výsledku v IS VaVaI

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Výsledek na webu

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DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

The porosity dependence of thermal conductivity

Popis výsledku v původním jazyce

Important tools for estimating the porosity dependence of the thermal conductivity are recalled and their application to refractories is indicated. It is shown that the Hashin-Shtrikman (HS) upper bound provides a rigorous limit that cannot be exceeded by any conductivity value, as long as the material's microstructure is isotropic. Moreover, for pores of approximately isometric shape all admissible model relations should reduce to the linear approximation with a coefficient 3/2 in the limit of low porosities. When the relative Young's modulus is accessible from measured data, a cross-property relation can be invoked to predict relative conductivity. After measuring thermal conductivity data, a one-parameter relation can be used for fitting. Using these tools it is possible to estimate the thermal conductivity of porous refractories, when phase volume fraction information is available (e.g. from XRD) and the temperature dependence of the phase conductivities is known.

Název v anglickém jazyce

The porosity dependence of thermal conductivity

Popis výsledku anglicky

Important tools for estimating the porosity dependence of the thermal conductivity are recalled and their application to refractories is indicated. It is shown that the Hashin-Shtrikman (HS) upper bound provides a rigorous limit that cannot be exceeded by any conductivity value, as long as the material's microstructure is isotropic. Moreover, for pores of approximately isometric shape all admissible model relations should reduce to the linear approximation with a coefficient 3/2 in the limit of low porosities. When the relative Young's modulus is accessible from measured data, a cross-property relation can be invoked to predict relative conductivity. After measuring thermal conductivity data, a one-parameter relation can be used for fitting. Using these tools it is possible to estimate the thermal conductivity of porous refractories, when phase volume fraction information is available (e.g. from XRD) and the temperature dependence of the phase conductivities is known.

Druh

D - Stať ve sborníku

CEP obor

JH - Keramika, žáruvzdorné materiály a skla

OECD FORD obor

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Projekt

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Návaznosti

Z - Vyzkumny zamer (s odkazem do CEZ)<br>S - Specificky vyzkum na vysokych skolach

Rok uplatnění

2011

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název statě ve sborníku

Proceedings XVII. International Conference on Refractories

ISBN

978-80-02-02309-8

ISSN

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e-ISSN

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Počet stran výsledku

9

Strana od-do

301-309

Název nakladatele

Czech Silicate Society

Místo vydání

Prague

Místo konání akce

Prague, Czech Republic

Datum konání akce

10. 5. 2011

Typ akce podle státní příslušnosti

EUR - Evropská akce

Kód UT WoS článku

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