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Article: Effective thermal conductivity of nanofluids: The effects of microstructure

TitleEffective thermal conductivity of nanofluids: The effects of microstructure
Authors
KeywordsConductivity enhancement
Effective thermal conductivity
Fluid conductivity
Fluid interfacial area
Geometrical structure
Issue Date2010
PublisherInstitute of Physics Publishing. The Journal's web site is located at http://www.iop.org/Journals/jpd
Citation
Journal Of Physics D: Applied Physics, 2010, v. 43 n. 16 How to Cite?
AbstractWe examine numerically the effects of particle-fluid thermal conductivity ratio, particle volume fraction, particle size distribution and particle aggregation on macroscale thermal properties for seven kinds of two-dimensional nanofluids. The results show that the radius of gyration and the non-dimensional particle-fluid interfacial area are two important parameters in characterizing the geometrical structure of nanoparticles. A non-uniform particle size is found to be unfavourable for the conductivity enhancement, while particle-aggregation benefits the enhancement especially when the radius of gyration of aggregates is large. Without considering the interfacial thermal resistance, a larger non-dimensional particle-fluid interfacial area between the base fluid and the nanoparticles is also desirable for enhancing thermal conductivity. The nanofluids with nanoparticles of connected cross-shape show a much higher (lower) effective thermal conductivity when the particle-fluid conductivity ratio is larger (smaller) than 1. © 2010 IOP Publishing Ltd.
Persistent Identifierhttp://hdl.handle.net/10722/124844
ISSN
2015 Impact Factor: 2.772
2015 SCImago Journal Rankings: 0.682
ISI Accession Number ID
Funding AgencyGrant Number
Research Grants Council of Hong KongGRF718009
Funding Information:

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

References

 

DC FieldValueLanguage
dc.contributor.authorFan, Jen_HK
dc.contributor.authorWang, Len_HK
dc.date.accessioned2010-10-31T10:57:21Z-
dc.date.available2010-10-31T10:57:21Z-
dc.date.issued2010en_HK
dc.identifier.citationJournal Of Physics D: Applied Physics, 2010, v. 43 n. 16en_HK
dc.identifier.issn0022-3727en_HK
dc.identifier.urihttp://hdl.handle.net/10722/124844-
dc.description.abstractWe examine numerically the effects of particle-fluid thermal conductivity ratio, particle volume fraction, particle size distribution and particle aggregation on macroscale thermal properties for seven kinds of two-dimensional nanofluids. The results show that the radius of gyration and the non-dimensional particle-fluid interfacial area are two important parameters in characterizing the geometrical structure of nanoparticles. A non-uniform particle size is found to be unfavourable for the conductivity enhancement, while particle-aggregation benefits the enhancement especially when the radius of gyration of aggregates is large. Without considering the interfacial thermal resistance, a larger non-dimensional particle-fluid interfacial area between the base fluid and the nanoparticles is also desirable for enhancing thermal conductivity. The nanofluids with nanoparticles of connected cross-shape show a much higher (lower) effective thermal conductivity when the particle-fluid conductivity ratio is larger (smaller) than 1. © 2010 IOP Publishing Ltd.en_HK
dc.languageengen_HK
dc.publisherInstitute of Physics Publishing. The Journal's web site is located at http://www.iop.org/Journals/jpden_HK
dc.relation.ispartofJournal of Physics D: Applied Physicsen_HK
dc.rightsJournal of Physics D: Applied Physics. Copyright © Institute of Physics Publishing.-
dc.subjectConductivity enhancement-
dc.subjectEffective thermal conductivity-
dc.subjectFluid conductivity-
dc.subjectFluid interfacial area-
dc.subjectGeometrical structure-
dc.titleEffective thermal conductivity of nanofluids: The effects of microstructureen_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=0022-3727&volume=43&issue=16 article no.165501&spage=&epage=&date=2010&atitle=Effective+thermal+conductivity+of+nanofluids:+The+effects+of+microstructureen_HK
dc.identifier.emailWang, L:lqwang@hkucc.hku.hken_HK
dc.identifier.authorityWang, L=rp00184en_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1088/0022-3727/43/16/165501en_HK
dc.identifier.scopuseid_2-s2.0-77951004516en_HK
dc.identifier.hkuros174440en_HK
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-77951004516&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume43en_HK
dc.identifier.issue16en_HK
dc.identifier.isiWOS:000276703300018-
dc.publisher.placeUnited Kingdomen_HK
dc.identifier.scopusauthoridFan, J=36019048800en_HK
dc.identifier.scopusauthoridWang, L=35235288500en_HK

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