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Permittivity and electrical conductivity of copper oxide nanofluid (12 nm) in water at different temperatures

2019Journal article Restricted access
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dc.contributor.authorCoelho, M.F.
dc.contributor.authorRivas, M.A.
dc.contributor.authorVilão, G.
dc.contributor.authorNogueira, E.M.
dc.contributor.authorIglesias, T.P.
dc.date.accessioned2024-07-10T13:05:18Z
dc.date.available2024-07-10T13:05:18Z
dc.date.issued2019
dc.description.abstractThe effective permittivity and electrical conductivity of copper oxide (12 nm) nanofluids in water are studied. The measurements were carried out at various concentrations (up to 2% in volume) and at six temperatures (from 298.15 K to 348.15 K). Empirical equations were used for describing the conductivity and the permittivity of the experimental data. The study shows the influence of the volume fraction, the temperature on relative permittivity and electrical conductivity. When compared with the previously published values for alumina (15 nm) in water, present results show the influence of the nanoparticle’s nature. The enhancement of both permittivity and electrical conductivity were calculated and their behaviour was analysed. It is discussed whether their positive values can be considered greater than what would be expected. The contributions to permittivity from volume, contrast and interactions are separated. Theoretical models are applied in the study of permittivity and electrical conductivity. The poor predictions of classical models for permittivity are attributed to the positive behaviour of the permittivity change on mixing for these nanofluids. The contributions to electrical conductivity from water and nanoparticles are separated.pt_PT
dc.description.versioninfo:eu-repo/semantics/publishedVersionpt_PT
dc.identifier.citationM.F. Coelho, M.A. Rivas, G. Vilão, E.M. Nogueira, T.P. Iglesias, Permittivity and electrical conductivity of copper oxide nanofluid (12 nm) in water at different temperatures, The Journal of Chemical Thermodynamics, Volume 132, 2019, Pages 164-173, ISSN 0021-9614, https://doi.org/10.1016/j.jct.2018.12.025pt_PT
dc.identifier.doi10.1016/j.jct.2018.12.025pt_PT
dc.identifier.issn0021-9614
dc.identifier.issn1096-3626
dc.identifier.urihttp://hdl.handle.net/10400.22/25771
dc.language.isoengpt_PT
dc.peerreviewedyespt_PT
dc.relation.publisherversionhttps://www.sciencedirect.com/science/article/pii/S0021961418308073pt_PT
dc.rights.urihttp://creativecommons.org/licenses/by-nc/4.0/pt_PT
dc.subjectCopper oxidept_PT
dc.subjectElectrical conductivitypt_PT
dc.subjectNanofluidspt_PT
dc.subjectNanoparticlespt_PT
dc.subjectRelative permittivitypt_PT
dc.subjectEthylene glycolpt_PT
dc.titlePermittivity and electrical conductivity of copper oxide nanofluid (12 nm) in water at different temperaturespt_PT
dc.typejournal article
dspace.entity.typePublication
oaire.citation.endPage173pt_PT
oaire.citation.startPage164pt_PT
oaire.citation.titleThe Journal of Chemical Thermodynamicspt_PT
oaire.citation.volume132pt_PT
person.familyNameCoelho
person.familyNameOliveira Vilão de Ramos
person.familyNameNogueira
person.familyNamePérez Iglesias
person.givenNameMaria de Fátima
person.givenNameGina Maria
person.givenNameElisabete Maria
person.givenNameMaría Teresa
person.identifier.ciencia-idD612-C5AF-5DBC
person.identifier.ciencia-id6412-F2A0-7EF9
person.identifier.orcid0000-0003-3613-8629
person.identifier.orcid0000-0003-2285-2960
person.identifier.orcid0000-0003-2079-252X
person.identifier.orcid0000-0003-0524-2570
person.identifier.ridB-6679-2017
person.identifier.scopus-author-id44761616000
person.identifier.scopus-author-id55463688500
person.identifier.scopus-author-id7005600099
rcaap.rightsclosedAccesspt_PT
rcaap.typearticlept_PT
relation.isAuthorOfPublication7955b7e4-c128-4ed7-90b3-ece2831d0538
relation.isAuthorOfPublication8a2fbb57-97c5-41d8-ab08-d764f43f51a7
relation.isAuthorOfPublicationd2c129fe-6e4e-421e-bab6-37415633b846
relation.isAuthorOfPublicationeca3fc7f-3a13-4e06-9dd1-8d906d9dada5
relation.isAuthorOfPublication.latestForDiscovery8a2fbb57-97c5-41d8-ab08-d764f43f51a7

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