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

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MetadadosDescriçãoIdioma
Autor(es): dc.contributorFederal Institute of Goiás, Department of Academic Areas IV-
Autor(es): dc.contributorUniversity of Illinois Chicago, Department of Chemical Engineering-
Autor(es): dc.contributorUniversity of Brasília, Department of Mechanical Engineering, Laboratory of Energy and Environment-
Autor(es): dc.creatorPimenta, Paulo Henrique Neves-
Autor(es): dc.creatorRebouças, Rodrigo B.-
Autor(es): dc.creatorOliveira, Taygoara Felamingo de-
Data de aceite: dc.date.accessioned2024-10-23T15:11:30Z-
Data de disponibilização: dc.date.available2024-10-23T15:11:30Z-
Data de envio: dc.date.issued2024-09-26-
Data de envio: dc.date.issued2024-09-26-
Data de envio: dc.date.issued2024-05-15-
Fonte completa do material: dc.identifierhttp://repositorio.unb.br/handle/10482/50465-
Fonte completa do material: dc.identifierhttps://doi.org/10.1016/j.jcis.2024.02.036-
Fonte completa do material: dc.identifierhttps://orcid.org/0000-0002-4145-5461-
Fonte completa do material: dc.identifierhttps://orcid.org/0000-0001-8982-3553-
Fonte completa do material: dc.identifierhttps://orcid.org/0000-0003-2957-537X-
Fonte: dc.identifier.urihttp://educapes.capes.gov.br/handle/capes/876788-
Descrição: dc.descriptionWe 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.-
Descrição: dc.descriptionFaculdade de Tecnologia (FT)-
Descrição: dc.descriptionDepartamento de Engenharia Mecânica (FT ENM)-
Idioma: dc.languageen-
Publicador: dc.publisherElsevier Inc.-
Relação: dc.relationhttps://www.sciencedirect.com/science/article/abs/pii/S0021979724002728?via%3Dihub-
Direitos: dc.rightsAcesso Restrito-
Palavras-chave: dc.subjectCampo magnético-
Palavras-chave: dc.subjectSurfactantes-
Palavras-chave: dc.subjectCisalhamento-
Título: dc.titleMagnetic field effects on the surfactant concentration over ferrofluid droplet surfaces in shear flows-
Tipo de arquivo: dc.typelivro digital-
Aparece nas coleções:Repositório Institucional – UNB

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