Magnetic field effects on the surfactant concentration over ferrofluid droplet surfaces in shear flows

Pimenta, Paulo Henrique Neves; Rebouças, Rodrigo B.; Oliveira, Taygoara Felamingo de

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Campo DC	Valor	Idioma
dc.contributor.author	Pimenta, Paulo Henrique Neves	-
dc.contributor.author	Rebouças, Rodrigo B.	-
dc.contributor.author	Oliveira, Taygoara Felamingo de	-
dc.date.accessioned	2024-09-26T19:22:55Z	-
dc.date.available	2024-09-26T19:22:55Z	-
dc.date.issued	2024-05-15	-
dc.identifier.citation	PIMENTA, P. H. N.; REBOUÇAS, R. B.; OLIVEIRA, T. F. Magnetic field effects on the surfactant concentration over ferrofluid droplet surfaces in shear flows. Journal of Colloid and Interface Science, [S. l.], v. 662, 15 maio 2024, p. 438-445. DOI: https://doi.org/10.1016/j.jcis.2024.02.036.	pt_BR
dc.identifier.uri	http://repositorio.unb.br/handle/10482/50465	-
dc.language.iso	eng	pt_BR
dc.publisher	Elsevier Inc.	pt_BR
dc.rights	Acesso Restrito	pt_BR
dc.title	Magnetic field effects on the surfactant concentration over ferrofluid droplet surfaces in shear flows	pt_BR
dc.type	Artigo	pt_BR
dc.subject.keyword	Campo magnético	pt_BR
dc.subject.keyword	Surfactantes	pt_BR
dc.subject.keyword	Cisalhamento	pt_BR
dc.identifier.doi	https://doi.org/10.1016/j.jcis.2024.02.036	pt_BR
dc.relation.publisherversion	https://www.sciencedirect.com/science/article/abs/pii/S0021979724002728?via%3Dihub	pt_BR
dc.description.abstract1	We investigate the impact of a magnetic field on surfactant concentration and interfacial forces across droplet surfaces within shear flows. Our analysis centers on a single two-dimensional ferrofluid droplet covered with surfactants, suspended in an immiscible, non-magnetizable liquid. The model combines incompressible Navier–Stokes equations and Maxwell's equations in the superparamagnetic limit in the single-fluid formulation, augmented by terms accounting for Marangoni, capillary, and magnetic forces at the droplet interface. We solve the surfactant convection-diffusion equation at the surface, while a non-linear Langmuir equation of state relates surfactant concentration to surface tension. The model is numerically solved using finite differences, a level-set method for multiphase flow computation, and the closest-point method for concentration equation. Our findings reveal that even though the surfactant is magnetically neutral, the presence of a magnetic field significantly modifies its distribution at the interface. A magnetic field perpendicular to the primary flow direction shifts the maximum concentration zone from the droplet tips toward the flow vorticity direction, while a parallel field produces the opposite effect. Alterations in surfactant distribution directly impact the surface tension field, offering a potential wireless means of controlling droplet dynamics.	pt_BR
dc.identifier.orcid	https://orcid.org/0000-0002-4145-5461	pt_BR
dc.identifier.orcid	https://orcid.org/0000-0001-8982-3553	pt_BR
dc.identifier.orcid	https://orcid.org/0000-0003-2957-537X	pt_BR
dc.contributor.affiliation	Federal Institute of Goiás, Department of Academic Areas IV	pt_BR
dc.contributor.affiliation	University of Illinois Chicago, Department of Chemical Engineering	pt_BR
dc.contributor.affiliation	University of Brasília, Department of Mechanical Engineering, Laboratory of Energy and Environment	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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