Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/349865
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dc.contributor.CRUESPUNIVERSIDADE ESTADUAL DE CAMPINASpt_BR
dc.contributor.authorunicampGontijo, Rafael Gabler-
dc.typeArtigopt_BR
dc.titleNew insights on boundary layer control using magnetic fluids : a numerical studypt_BR
dc.contributor.authorAlegretti, C.F.-
dc.contributor.authorGontijo, R.G.-
dc.subjectMagnetizaçãopt_BR
dc.subject.otherlanguageMagnetizationpt_BR
dc.description.abstractThis work investigates the effects of an applied magnetic field on the laminar flow of a ferrofluid over a backward-facing step. Both constitutive equation and global magnetization equation for a ferrofluid are considered. The resulting formulation consists in a coupled magnetic-hydrodynamic problem. Computational simulations are carried out in order to explore the physics of the flow and the consistency of theoretical aspects of our formulation. The unidirectional sudden expansion in a ferrofluid flow is investigated numerically under the perspective of Ferrohydrodynamics in a two-dimensional domain using a Finite Volumes Method. The boundary layer detachment induced by the sudden expansion results in a recirculating zone, which has been extensively studied in purely hydrodynamic problems for a wide range of Reynolds numbers. Similar investigations can be found in literature regarding the sudden expansion under the Magnetohydrodynamics framework, but none considering a colloidal suspension of magnetic particles out of the superparamagnetic regime in the framework of Ferrohydrodynamics. The vorticity-stream function formulation is implemented. Our simulations show a clear coupling between the flow vorticity and the magnetization field. We observe a systematic decay on the length of the recirculating zone as we increase the magnetic parameters of the flow, such as the intensity of the applied field and the volume fraction of particles. The results are discussed from a physical perspective in terms of the dynamical non-dimensional parameters. We argue that the reduction of the recirculating region is a direct consequence of the magnetic torque balancing the action of the torque produced by viscous and inertial forces of the flow. For the limiting case of small Reynolds and magnetic Reynolds numbers, the diffusion of vorticity balances the diffusion of the magnetic torque on the flow. This mechanism controls the growth of the recirculating regionpt_BR
dc.relation.ispartofJournal of magnetism and magnetic materialspt_BR
dc.relation.ispartofabbreviationJ. magn. magn. mater.pt_BR
dc.publisher.cityAmsterdampt_BR
dc.publisher.countryPaíses Baixospt_BR
dc.publisherElsevierpt_BR
dc.date.issued2020-
dc.date.monthofcirculationNov.pt_BR
dc.language.isoengpt_BR
dc.description.volume514pt_BR
dc.rightsFechadopt_BR
dc.sourceSCOPUSpt_BR
dc.identifier.issn0304-8853pt_BR
dc.identifier.eissn1873-4766pt_BR
dc.identifier.doi10.1016/j.jmmm.2020.167133pt_BR
dc.identifier.urlhttps://www.sciencedirect.com/science/article/pii/S0304885319327477pt_BR
dc.description.sponsorshipCONSELHO NACIONAL DE DESENVOLVIMENTO CIENTÍFICO E TECNOLÓGICO - CNPQpt_BR
dc.description.sponsorshipCOORDENAÇÃO DE APERFEIÇOAMENTO DE PESSOAL DE NÍVEL SUPERIOR - CAPESpt_BR
dc.description.sponsorshipFUNDAÇÃO DE AMPARO À PESQUISA DO ESTADO DE SÃO PAULO - FAPESPpt_BR
dc.description.sponsordocumentnumber2017/05643-8pt_BR
dc.description.sponsordocumentnumberNão tempt_BR
dc.description.sponsordocumentnumberNão tempt_BR
dc.date.available2020-09-24T15:10:57Z-
dc.date.accessioned2020-09-24T15:10:57Z-
dc.description.provenanceSubmitted by Susilene Barbosa da Silva (susilene@unicamp.br) on 2020-09-24T15:10:57Z No. of bitstreams: 0. Added 1 bitstream(s) on 2021-01-07T20:39:56Z : No. of bitstreams: 1 2-s2.0-85088905334.pdf: 1435529 bytes, checksum: e69b4d41cd98c5fcba6fc9fac243575d (MD5) Bitstreams deleted on 2021-01-08T14:10:25Z: 2-s2.0-85088905334.pdf,. Added 1 bitstream(s) on 2021-01-08T14:13:41Z : No. of bitstreams: 1 2-s2.0-85088905334.pdf: 1435529 bytes, checksum: e69b4d41cd98c5fcba6fc9fac243575d (MD5) Bitstreams deleted on 2021-01-13T13:27:15Z: 2-s2.0-85088905334.pdf,. Added 1 bitstream(s) on 2021-01-13T13:29:36Z : No. of bitstreams: 1 2-s2.0-85088905334.pdf: 1435535 bytes, checksum: 52e9a62a717d71ccc2c8d4c66129e15f (MD5)en
dc.description.provenanceMade available in DSpace on 2020-09-24T15:10:57Z (GMT). No. of bitstreams: 0 Previous issue date: 2020en
dc.identifier.urihttp://repositorio.unicamp.br/jspui/handle/REPOSIP/349865-
dc.contributor.departmentDepartamento de Energiapt_BR
dc.contributor.unidadeFaculdade de Engenharia Mecânicapt_BR
dc.subject.keywordBoundary layer detachmentpt_BR
dc.subject.keywordFerrofluidpt_BR
dc.subject.keywordFerrohydrodynamicspt_BR
dc.subject.keywordSudden expansionpt_BR
dc.identifier.source2-s2.0-85088905334pt_BR
dc.creator.orcid0000-0002-8610-7903pt_BR
dc.type.formArtigopt_BR
dc.identifier.articleid167133pt_BR
dc.description.sponsorNoteThis work was supported in part by the grant 301467/2017-0 from the Council of Ministry of Science and Technology (CNPq-Brazil). It was also supported by grant 2017/05643-8 from the Fundação de Amparo à Pesquisa do Estado de São Paulo – FAPESP-Brazil. CFA also wish to acknowledge CNPQ-BRAZIL for supporting him with a scholarship during his master degree in Mechanical Science at University of Brasília-Brazil under the grant 132268/2017-5 and PRP-Unicamp for a partial finantial support for his participation at the 15th International Conference on Magnetic Fluidspt_BR
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