Heat transfer in one-dimensional micro- and nano-cellular foams

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F60461373%3A22340%2F13%3A43895656" target="_blank" >RIV/60461373:22340/13:43895656 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/49777513:23640/13:43918871

Výsledek na webu

<a href="http://www.sciencedirect.com/science/article/pii/S0009250913002777" target="_blank" >http://www.sciencedirect.com/science/article/pii/S0009250913002777</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.ces.2013.04.018" target="_blank" >10.1016/j.ces.2013.04.018</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Heat transfer in one-dimensional micro- and nano-cellular foams

Popis výsledku v původním jazyce

We investigate heat transfer in one-dimensional multi-layer models of polymer foams and determine their equivalent thermal conductivities. The proposed model considers the participating gas and solid phases, i.e., combined heat transfer by conduction andradiation in both phases and partial photon reflection on phase interfaces. A correction for possible non-Fourier heat conduction in small gas cells, occurring in nanocellular foams, is implemented by the reduction of gas thermal conductivity based on the Knudsen number. The developed model was used for the optimization of foam structure with respect to its insulation properties. We found that although radiation can account for more than one-third of the total heat flux, it can be reduced in foams withcell-sizes below 100?m and be almost nullified by decreasing the foam cell size to sub-micron range. The presented model is a starting point for the development of an advanced model of heat transfer in spatially three-dimensional polymer

Název v anglickém jazyce

Heat transfer in one-dimensional micro- and nano-cellular foams

Popis výsledku anglicky

We investigate heat transfer in one-dimensional multi-layer models of polymer foams and determine their equivalent thermal conductivities. The proposed model considers the participating gas and solid phases, i.e., combined heat transfer by conduction andradiation in both phases and partial photon reflection on phase interfaces. A correction for possible non-Fourier heat conduction in small gas cells, occurring in nanocellular foams, is implemented by the reduction of gas thermal conductivity based on the Knudsen number. The developed model was used for the optimization of foam structure with respect to its insulation properties. We found that although radiation can account for more than one-third of the total heat flux, it can be reduced in foams withcell-sizes below 100?m and be almost nullified by decreasing the foam cell size to sub-micron range. The presented model is a starting point for the development of an advanced model of heat transfer in spatially three-dimensional polymer

Druh

J_x - Nezařazeno - Článek v odborném periodiku (Jimp, Jsc a Jost)

CEP obor

CI - Průmyslová chemie a chemické inženýrství

OECD FORD obor

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Projekt

Výsledek vznikl pri realizaci vícero projektů. Více informací v záložce Projekty.

Návaznosti

S - Specificky vyzkum na vysokych skolach

Rok uplatnění

2013

Kód důvěrnosti údajů

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

Název periodika

Chemical Engineering Science

ISSN

0009-2509

e-ISSN

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Svazek periodika

97

Číslo periodika v rámci svazku

Rok 2013

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

9

Strana od-do

50-58

Kód UT WoS článku

000320508700005

EID výsledku v databázi Scopus

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