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Metadados | Descrição | Idioma |
---|---|---|
Autor(es): dc.contributor | Federal Institute of Goiás, Department of Academic Areas IV | - |
Autor(es): dc.contributor | University of Illinois Chicago, Department of Chemical Engineering | - |
Autor(es): dc.contributor | University of Brasília, Department of Mechanical Engineering, Laboratory of Energy and Environment | - |
Autor(es): dc.creator | Pimenta, Paulo Henrique Neves | - |
Autor(es): dc.creator | Rebouças, Rodrigo B. | - |
Autor(es): dc.creator | Oliveira, Taygoara Felamingo de | - |
Data de aceite: dc.date.accessioned | 2024-10-23T15:11:30Z | - |
Data de disponibilização: dc.date.available | 2024-10-23T15:11:30Z | - |
Data de envio: dc.date.issued | 2024-09-26 | - |
Data de envio: dc.date.issued | 2024-09-26 | - |
Data de envio: dc.date.issued | 2024-05-15 | - |
Fonte completa do material: dc.identifier | http://repositorio.unb.br/handle/10482/50465 | - |
Fonte completa do material: dc.identifier | https://doi.org/10.1016/j.jcis.2024.02.036 | - |
Fonte completa do material: dc.identifier | https://orcid.org/0000-0002-4145-5461 | - |
Fonte completa do material: dc.identifier | https://orcid.org/0000-0001-8982-3553 | - |
Fonte completa do material: dc.identifier | https://orcid.org/0000-0003-2957-537X | - |
Fonte: dc.identifier.uri | http://educapes.capes.gov.br/handle/capes/876788 | - |
Descrição: dc.description | 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. | - |
Descrição: dc.description | Faculdade de Tecnologia (FT) | - |
Descrição: dc.description | Departamento de Engenharia Mecânica (FT ENM) | - |
Idioma: dc.language | en | - |
Publicador: dc.publisher | Elsevier Inc. | - |
Relação: dc.relation | https://www.sciencedirect.com/science/article/abs/pii/S0021979724002728?via%3Dihub | - |
Direitos: dc.rights | Acesso Restrito | - |
Palavras-chave: dc.subject | Campo magnético | - |
Palavras-chave: dc.subject | Surfactantes | - |
Palavras-chave: dc.subject | Cisalhamento | - |
Título: dc.title | Magnetic field effects on the surfactant concentration over ferrofluid droplet surfaces in shear flows | - |
Tipo de arquivo: dc.type | livro digital | - |
Aparece nas coleções: | Repositório Institucional – UNB |
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