Understanding the dynamics of gas-liquid-solid contact points

• Ano de defesa: 2015
• Autor(a) principal: Ribera, Rodrigo Lisita
• Tipo de documento: Tese
• Tipo de acesso: Acesso aberto
• Idioma: eng
• Instituição de defesa: Universidade Federal de Uberlândia; Brasil; Programa de Pós-graduação em Engenharia Mecânica
• Palavras-chave em Português: Engenharia mecânica; Escoamento multifásico; Tensão superficial; Método VOF; Angulo de contato; Ponto de contato; Força de tensão supeficial; Método da fronteira immersa; Multiphase flows; VOF method; Contact angle; Contact point; Surface tension force; Immersed boundary method; CNPQ::ENGENHARIAS::ENGENHARIA MECANICA
• Link de acesso: https://repositorio.ufu.br/handle/123456789/21285; https://doi.org/10.14393/ufu.te.2015.14

The objective of this work is to study, implement and numerical simulate the VOF multiphase flow model and to study the contact between the fluid-liquid-solid, know as the triple point region, in a structured adaptative mesh refinement code (AMR3D). The work focus on developing mathematical models, computational techniques and validation of these, to efficiently and accurately model the fluid-liquid-solid contact dynamics. The main objective of the project is to construct a model capturing the fluid-liquid-solids contact dynamics in multiphase flows. This model should be: (i) accurate, (ii) robust and (iii) as generic as possible. It is also aimed to validate the predictions of the model with results obtained from experiments or from the literature. Developments are made in a three-dimensional computational code for the simulation of multiphase flows, with adaptative mesh refinement and a model for the contact point between the fluid phases and the solid that is general and robust enough to simulate walls other than flat surfaces, imposed through the Immersed Boundary Method, and that is capable of representing the physics of the problem. A better understanding of the dynamic of droplets at walls is obtained, with the study of the relevant parameters that affects the physics of the contact line.