Phase Mixture Models for the Thermal Conductivity of Nanofluids and Nanocrystalline Solids

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F60461373%3A22310%2F09%3A00021605" target="_blank" >RIV/60461373:22310/09:00021605 - isvavai.cz</a>

Result on the web

—

DOI - Digital Object Identifier

—

Result language

angličtina

Original language name

Phase Mixture Models for the Thermal Conductivity of Nanofluids and Nanocrystalline Solids

Original language description

Nanofluids exhibit enhanced thermal conductivity with decreasing particle size, while nanocrystalline solids show a thermal conductivity reduction with decreasing grain size. Both phenomena can be modeled as being due to a boundary phase acting as a thermal bridge or barrier, respectively. In this paper a new phase mixture model is presented, based on a ?mixed average? of the upper and lower Wiener bounds. It is shown that in the case of alumina-water nanofluids our model is able to describe very well the experimentally measured data for nanofluids with 38, 25 and 13 nm alumina particles, when the solid-like boundary phase is assumed to possess ice-like thermal conductivity (2 W/mK) and a thickness of 1-5 nm. For nanocrystalline alumina (assuming a grain boundary with thickness 1 nm and a glass-like conductivity value of 1.1 W/mK), it is shown that significant grain size effects cannot be expected for grain sizes above 100 nm and a more than 10 % conductivity reduction requires grain s

Czech name

—

Czech description

—

Type

J_x - Unclassified - Peer-reviewed scientific article (Jimp, Jsc and Jost)

CEP classification

JH - Ceramics, fire-proof materials and glass

OECD FORD branch

—

Project

<a href="/en/project/IAA401250703" target="_blank" >IAA401250703: POROUS CERAMICS, CERAMIC COMPOSITES AND NANOCERAMICS</a><br>

Continuities

Z - Vyzkumny zamer (s odkazem do CEZ)

Publication year

2009

Confidentiality

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

Name of the periodical

AIP Conference Proceedings

ISSN

0094-243X

e-ISSN

—

Volume of the periodical

—

Issue of the periodical within the volume

1145

Country of publishing house

US - UNITED STATES

Number of pages

4

Pages from-to

—

UT code for WoS article

000270602900020

EID of the result in the Scopus database

—