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dc.contributor.authorVatani, Ashkan
dc.contributor.authorWoodfield, Peter Lloyd
dc.contributor.authorNam-Trung, Nguyen
dc.contributor.authorDao, Dzung Viet
dc.date.accessioned2019-05-29T12:36:14Z
dc.date.available2019-05-29T12:36:14Z
dc.date.issued2018
dc.identifier.issn0304-8853
dc.identifier.doi10.1016/j.jmmm.2018.02.040
dc.identifier.urihttp://hdl.handle.net/10072/380451
dc.description.abstractThe onset of thermomagnetic convection in ferrofluid in a vertical transient hot-wire cell is analytically and experimentally investigated by studying the temperature rise of an electrically-heated wire. During the initial stage of heating, the temperature rise is found to correspond well to that predicted by conduction only. For high electrical current densities, the initial heating stage is followed by a sudden change in the slope of the temperature rise with respect to time as a result of the onset of thermomagnetic convection cooling. The observed onset of thermomagnetic convection was then compared to that of natural convection of deionized water. For the first time, the critical time corresponding to the onset of thermomagnetic convection around an electrically-heated wire is characterized and non-dimensionalized as a critical Fourier number (Foc). We propose an equation for Foc as a function of a magnetic Rayleigh number to predict the time for the onset of thermomagnetic convection. We observed that thermomagnetic convection in ferrofluid occurs earlier than natural convection in non-magnetic fluids for similar experimental conditions. The onset of thermomagnetic convection is dependent on the current supplied to the wire. The findings have important implications for cooling of high-power electronics using ferrofluids and for measuring thermal properties of ferrofluids.
dc.description.peerreviewedYes
dc.languageEnglish
dc.language.isoeng
dc.publisherElsevier
dc.publisher.placeNetherlands
dc.relation.ispartofpagefrom300
dc.relation.ispartofpageto306
dc.relation.ispartofjournalJournal of Magnetism and Magnetic Materials
dc.relation.ispartofvolume456
dc.subject.fieldofresearchCondensed matter physics
dc.subject.fieldofresearchMaterials engineering
dc.subject.fieldofresearchMaterials engineering not elsewhere classified
dc.subject.fieldofresearchMechanical engineering
dc.subject.fieldofresearchcode5104
dc.subject.fieldofresearchcode4016
dc.subject.fieldofresearchcode401699
dc.subject.fieldofresearchcode4017
dc.titleOnset of thermomagnetic convection around a vertically oriented hot-wire in ferrofluid
dc.typeJournal article
dc.type.descriptionC1 - Articles
dc.type.codeC - Journal Articles
dcterms.licensehttp://creativecommons.org/licenses/by-nc-nd/4.0/
dc.description.versionAccepted Manuscript (AM)
gro.facultyGriffith Sciences, School of Engineering and Built Environment
gro.rights.copyright© 2018 Elsevier. Licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International Licence (http://creativecommons.org/licenses/by-nc-nd/4.0/) which permits unrestricted, non-commercial use, distribution and reproduction in any medium, providing that the work is properly cited.
gro.hasfulltextFull Text
gro.griffith.authorWoodfield, Peter L.
gro.griffith.authorDao, Dzung V.
gro.griffith.authorNguyen, Nam-Trung


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