Título :	Influence of a nonuniform magnetic field on the flow and heat transfer of a thermosensitive ferrofluid
Autor :	Castro, Luís Henrique Fraga Oliveira, Taygoara Felamingo de Rosa, Adriano Possebon
metadata.dc.identifier.orcid:	https://orcid.org/0009-0004-5762-4700 https://orcid.org/0000-0003-2957-537X https://orcid.org/0000-0003-3255-422X
metadata.dc.contributor.affiliation:	University of Brasília, Energy and Environment Laboratory University of Brasília, Energy and Environment Laboratory University of Brasília, Energy and Environment Laboratory
Assunto::	Campo magnético Ferrofluidos Transferência de calor
Fecha de publicación :	3-oct-2024
Editorial :	AIP Publishing
Citación :	CASTRO, Luís Henrique Fraga; OLIVEIRA, Taygoara Felamingo de; ROSA, Adriano Possebon.Influence of a nonuniform magnetic field on the flow and heat transfer of a thermosensitive ferrofluid. Physics of Fluids, Maryland, v. 36, n. 10, e103104, 2024. DOI: https://doi.org/10.1063/5.0228839. Disponível em: https://pubs.aip.org/aip/pof/article/36/10/103104/3315349/Influence-of-a-nonuniform-magnetic-field-on-the. Acesso em: 30 jun. 2025.
Abstract:	In this work, we numerically investigate how a nonuniform magnetic field affects the flow and heat transfer in a bottom-heated closed enclosure filled with a thermosensitive ferrofluid. Under the simultaneous action of the gravitational and external magnetic field, a complex flow develops inside the cavity. We change the intensity of the external magnetic field aiming to understand how the flow field, temperature distribution, and net heat transfer are affected. Our findings reveal that the magnetic field has a significant influence on the topology of the flow and temperature fields, consequently impacting the overall heat transfer. It is possible to use the magnetic field generated by a conducting wire to change the net heat transfer through the cavity. We found that the average Nusselt number is a growing function of the magnetic field intensity, except for a specific Rayleigh number. Furthermore, we recognize non-stationary regimes at intermediate magnetic Rayleigh numbers, associated with unstable topological transitions in the flow pattern induced by the magnetic field. Consequently, we uncover flow regimes characterized by steady boundary conditions but exhibiting periodic flow and heat transfer patterns. Additionally, we observe that the unsteady topological transitions are suppressed by high magnetic Rayleigh numbers, resulting in steady flow.
metadata.dc.description.unidade:	Faculdade de Tecnologia (FT) Departamento de Engenharia Mecânica (FT ENM)
metadata.dc.description.ppg:	Programa de Pós-Graduação em Ciências Mecânicas
DOI:	https://doi.org/10.1063/5.0228839
metadata.dc.relation.publisherversion:	https://pubs.aip.org/aip/pof/article/36/10/103104/3315349/Influence-of-a-nonuniform-magnetic-field-on-the
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