Effect of particle dipolar interactions on the viscoelastic response of dilute ferrofluids undergoing oscillatory shear

Cunha, Francisco Ricardo da; Rosa, Adriano Possebon

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Campo DC	Valor	Idioma
dc.contributor.author	Cunha, Francisco Ricardo da	-
dc.contributor.author	Rosa, Adriano Possebon	-
dc.date.accessioned	2023-11-21T18:31:39Z	-
dc.date.available	2023-11-21T18:31:39Z	-
dc.date.issued	2021-09	-
dc.identifier.citation	CUNHA, Francisco Ricardo da; ROSA, Adriano Possebon. Effect of particle dipolar interactions on the viscoelastic response of dilute ferrofluids undergoing oscillatory shear. Phys. Fluids, [s.l.], v. 33, 092004, 2021. DOI: https://doi.org/10.1063/5.0064960. Disponível em: https://pubs.aip.org/aip/pof/article-abstract/33/9/092004/1064327/Effect-of-particle-dipolar-interactions-on-the?redirectedFrom=fulltext. Acesso em: 21 nov. 2023.	pt_BR
dc.identifier.uri	http://repositorio2.unb.br/jspui/handle/10482/46886	-
dc.language.iso	eng	pt_BR
dc.publisher	AIP Publishing	pt_BR
dc.rights	Acesso Restrito	pt_BR
dc.title	Effect of particle dipolar interactions on the viscoelastic response of dilute ferrofluids undergoing oscillatory shear	pt_BR
dc.type	Artigo	pt_BR
dc.subject.keyword	Ferrofluidos	pt_BR
dc.subject.keyword	Viscoelasticidade	pt_BR
dc.subject.keyword	Interações dipolares	pt_BR
dc.rights.license	Published under an exclusive license by AIP Publishing	pt_BR
dc.identifier.doi	https://doi.org/10.1063/5.0064960	pt_BR
dc.relation.publisherversion	https://pubs.aip.org/aip/pof/article-abstract/33/9/092004/1064327/Effect-of-particle-dipolar-interactions-on-the?redirectedFrom=fulltext	pt_BR
dc.description.abstract1	In this work, we investigate the viscoelastic behavior of a ferrofluid undergoing an oscillatory simple shear flow and also under the influence of an external magnetic field. The main goal is to examine the influence of the dipolar interactions and formation of anisotropic structures on the macroscopic rheological response of these complex fluids. This study is performed by direct numerical simulation of neutrally buoyant, Brownian magnetic spheres in the limit of vanishingly small Reynolds numbers using Brownian dynamics. The long-range dipolar interactions are computed by the Ewald summation technique. We present the in-phase and out-of-phase rotational viscosity components as a function of the oscillatory frequency for several values of the dipolar interaction parameter and shear strain. The results show that the viscoelastic transition in the fluid is anticipated in the presence of dipolar interactions. These phenomena are probably related to the formation of complex structures in the fluid like anisotropic linear chains. In addition, a qualitative analysis of microstructure transitions during the suspension time evolution indicates the formation of long anisotropic chains for the high strength of the dipolar interaction and small shear rates. The simulation results are compared with the classical Maxwell linear viscoelastic model, and a characteristic relaxation time is identified for the investigated ferrofluid. We also offer evidence that this relaxation time has a quadratic power law scaling dependence on the dipolar interaction parameter and that the dipolar interactions are the main physical mechanics, which creates elastic response of the ferrofluid investigated here as a direct consequence of the gain of memory at the microscopic level due to the action of the magnetic torque on the particles and the formation of oriented aggregative structures like anisotropic chains.	pt_BR
dc.identifier.orcid	https://orcid.org/0000-0003-2882-8195	pt_BR
dc.identifier.orcid	https://orcid.org/0000-0003-3255-422X	pt_BR
dc.contributor.affiliation	University of Brasılia, Department of Mechanical Engineering, Laboratory of Microhydrodynamics and Rheology	pt_BR
dc.contributor.affiliation	University of Brasılia, Department of Mechanical Engineering, Laboratory of Microhydrodynamics and Rheology	pt_BR
dc.description.unidade	Faculdade de Tecnologia (FT)	pt_BR
dc.description.unidade	Departamento de Engenharia Mecânica (FT ENM)	pt_BR
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