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Article: Microstructural effects on macroscale thermal properties in nanofluids

TitleMicrostructural effects on macroscale thermal properties in nanofluids
Authors
KeywordsDual-Phase-Lagging Heat Conduction
Effective Thermal Conductivity
Macroscale Thermal Properties
Nanofluids
Issue Date2010
PublisherWorld Scientific Publishing Co Pte Ltd. The Journal's web site is located at http://www.worldscinet.com/nano/nano.shtml
Citation
Nano, 2010, v. 5 n. 2, p. 117-125 How to Cite?
AbstractThe recent first-principle model shows that heat conduction in nanofluids can be diffusion-dominant or thermal-wave-dominant depending on their microscale physics (structures, properties and activities). As the first attempt of quantifying when and to what extent thermal waves become important, we numerically examine effects of particlefluid conductivity ratio, particle shape, volume fraction and nondimensional particlefluid interfacial area in the unit-cell on macroscale thermal properties for nanofluids consisting of in-line arrays of perfectly dispersed two-dimensional circular, square and hollow particles, respectively. In simple and perfectly dispersed nanofluids, the heat conduction is diffusion-dominant so the effective thermal conductivity can be predicted adequately by the mixture rule with the effect of particle shape and particlefluid conductivity ratio incorporated into its empirical parameter. Thermal waves appear more likely at smaller particlefluid conductivity ratio (< 1) and lower particle-volume-fraction, which agrees with the experimentally observed significant conductivity enhancement in the oil-in-water emulsion. The computed thermal conductivity predicts some experimental data in the literature very well and shows the sensitivity to the nondimensional particlefluid interfacial area in the unit-cell. © 2010 World Scientific Publishing Company.
Persistent Identifierhttp://hdl.handle.net/10722/157089
ISSN
2015 Impact Factor: 0.951
2015 SCImago Journal Rankings: 0.271
ISI Accession Number ID
Funding AgencyGrant Number
Research Grants Council of Hong KongGRF718009
GRF 717508
Funding Information:

The financial support from the Research Grants Council of Hong Kong (GRF718009 and GRF 717508) is gratefully acknowledged.

References

 

DC FieldValueLanguage
dc.contributor.authorFan, Jen_US
dc.contributor.authorWang, Len_US
dc.date.accessioned2012-08-08T08:45:16Z-
dc.date.available2012-08-08T08:45:16Z-
dc.date.issued2010en_US
dc.identifier.citationNano, 2010, v. 5 n. 2, p. 117-125en_US
dc.identifier.issn1793-2920en_US
dc.identifier.urihttp://hdl.handle.net/10722/157089-
dc.description.abstractThe recent first-principle model shows that heat conduction in nanofluids can be diffusion-dominant or thermal-wave-dominant depending on their microscale physics (structures, properties and activities). As the first attempt of quantifying when and to what extent thermal waves become important, we numerically examine effects of particlefluid conductivity ratio, particle shape, volume fraction and nondimensional particlefluid interfacial area in the unit-cell on macroscale thermal properties for nanofluids consisting of in-line arrays of perfectly dispersed two-dimensional circular, square and hollow particles, respectively. In simple and perfectly dispersed nanofluids, the heat conduction is diffusion-dominant so the effective thermal conductivity can be predicted adequately by the mixture rule with the effect of particle shape and particlefluid conductivity ratio incorporated into its empirical parameter. Thermal waves appear more likely at smaller particlefluid conductivity ratio (< 1) and lower particle-volume-fraction, which agrees with the experimentally observed significant conductivity enhancement in the oil-in-water emulsion. The computed thermal conductivity predicts some experimental data in the literature very well and shows the sensitivity to the nondimensional particlefluid interfacial area in the unit-cell. © 2010 World Scientific Publishing Company.en_US
dc.languageengen_US
dc.publisherWorld Scientific Publishing Co Pte Ltd. The Journal's web site is located at http://www.worldscinet.com/nano/nano.shtmlen_US
dc.relation.ispartofNanoen_US
dc.subjectDual-Phase-Lagging Heat Conductionen_US
dc.subjectEffective Thermal Conductivityen_US
dc.subjectMacroscale Thermal Propertiesen_US
dc.subjectNanofluidsen_US
dc.titleMicrostructural effects on macroscale thermal properties in nanofluidsen_US
dc.typeArticleen_US
dc.identifier.emailWang, L:lqwang@hkucc.hku.hken_US
dc.identifier.authorityWang, L=rp00184en_US
dc.description.naturelink_to_subscribed_fulltexten_US
dc.identifier.doi10.1142/S1793292010002001en_US
dc.identifier.scopuseid_2-s2.0-78049456659en_US
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-78049456659&selection=ref&src=s&origin=recordpageen_US
dc.identifier.volume5en_US
dc.identifier.issue2en_US
dc.identifier.spage117en_US
dc.identifier.epage125en_US
dc.identifier.isiWOS:000283604200006-
dc.publisher.placeSingaporeen_US
dc.identifier.scopusauthoridFan, J=36019048800en_US
dc.identifier.scopusauthoridWang, L=35235288500en_US

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