Título:	Study on the rheology of a dilute emulsion of surfactant-covered droplets using the level set and closest point methods
Autor(es):	Pimenta, Paulo Henrique Neves Oliveira, Taygoara Felamingo de
ORCID:	https://orcid.org/0000-0002-4145-5461 https://orcid.org/0000-0003-2957-537X
Afiliação do autor:	University of Brasılia, Department of Mechanical Engineering, Laboratory of Energy and Environment University of Brasılia, Department of Mechanical Engineering, Laboratory of Energy and Environment
Assunto:	Reologia Dinâmica dos fluidos Emulsões Surfactantes
Data de publicação:	Out-2021
Editora:	AIP Publishing
Referência:	PIMENTA, Paulo Henrique Neves; OLIVEIRA, Taygoara Felamingo de. Study on the rheology of a dilute emulsion of surfactant-covered droplets using the level set and closest point methods. Physics of Fluids, [S. l.], v. 33, 103306, 2021. DOI: https://doi.org/10.1063/5.0064729. Disponível em: https://pubs.aip.org/aip/pof/article-abstract/33/10/103306/1064935/Study-on-the-rheology-of-a-dilute-emulsion-of?redirectedFrom=fulltext. Acesso em: 21 nov. 2023.
Abstract:	In this work, we study the effects of surfactant elasticity (E), coverage factor (X), and Peclet number (Pe) on the droplet shape and emulsion rheology. Our analysis considers a single two-dimensional surfactant-covered droplet in an immiscible liquid submitted to a simple shear flow. The numerical methodology combines the level set, to capture the interface, and the closest point method to solve the surfactant transport equation. We separate the dilute phase contribution to the bulk stress tensor in the capillary stress, associated with the normal stress jump, and the Marangoni stress, related to the stress tangent to the interface. Our results show that E and X affect the droplet shape more intensely than the Pe. On the other hand, Pe directly affects the emulsion’s bulk viscosity. For Pe 1, the capillary viscosity decreases with X, while the Marangoni viscosity grows with X. Such a compensation mechanism allows the increase in the bulk viscosity with X. We also present results for the first normal stress difference.
Unidade Acadêmica:	Faculdade de Tecnologia (FT) Departamento de Engenharia Mecânica (FT ENM)
DOI:	https://doi.org/10.1063/5.0064729
Versão da editora:	https://pubs.aip.org/aip/pof/article-abstract/33/10/103306/1064935/Study-on-the-rheology-of-a-dilute-emulsion-of?redirectedFrom=fulltext
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