About: The porosity dependence of thermal conductivity

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rdf:type	skos:Concept http://linked.opendata.cz/ontology/domain/vavai/Vysledek
Description	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. 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. (en)
Title	The porosity dependence of thermal conductivity The porosity dependence of thermal conductivity (en)
skos:prefLabel	The porosity dependence of thermal conductivity The porosity dependence of thermal conductivity (en)
skos:notation	RIV/60461373:22310/11:43891503!RIV12-MSM-22310___
http://linked.open...avai/riv/aktivita	S Z
http://linked.open...avai/riv/aktivity	S, Z(MSM6046137302)
http://linked.open...vai/riv/dodaniDat	2012
http://linked.open...aciTvurceVysledku	Pabst, Willi Hostaša, Jan
http://linked.open.../riv/druhVysledku	D - Článek ve sborníku
http://linked.open...iv/duvernostUdaju	S - Úplné a pravdivé údaje nepodléhající ochraně podle zvláštních právních předpisů
http://linked.open...titaPredkladatele	Vysoká škola chemicko-technologická v Praze / Fakulta chemické technologie
http://linked.open...dnocenehoVysledku	221418
http://linked.open...ai/riv/idVysledku	RIV/60461373:22310/11:43891503
http://linked.open...riv/jazykVysledku	eng - angličtina
http://linked.open.../riv/klicovaSlova	sigmoidal average; Coble-Kingery relation; Hashin-Shtrikman bound; porosity; Thermal conductivity (en)
http://linked.open.../riv/klicoveSlovo	porosity Thermal conductivity Coble-Kingery relation Hashin-Shtrikman bound sigmoidal average
http://linked.open...ontrolniKodProRIV	[1E7EC68676B9]
http://linked.open...v/mistoKonaniAkce	Prague, Czech Republic
http://linked.open...i/riv/mistoVydani	Prague
http://linked.open...i/riv/nazevZdroje	Proceedings XVII. International Conference on Refractories
http://linked.open...in/vavai/riv/obor	JH
http://linked.open...ichTvurcuVysledku	2 (xsd:int)
http://linked.open...cetTvurcuVysledku	2 (xsd:int)
http://linked.open...UplatneniVysledku	2011
http://linked.open...iv/tvurceVysledku	Pabst, Willi Hostaša, Jan
http://linked.open...vavai/riv/typAkce	EUR - Evropská
http://linked.open.../riv/zahajeniAkce	2011-05-10 (xsd:date)
http://linked.open...n/vavai/riv/zamer	Preparation and research of functional materials and material technologies using micro- and nanoscopic methods
number of pages	9 (xsd:int)
http://purl.org/ne...btex#hasPublisher	Czech Silicate Society
https://schema.org/isbn	978-80-02-02309-8
http://localhost/t...ganizacniJednotka	22310

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