Simulação Numérica de Escoamento Eletroosmótico Usando o Modelo Constitutivo de Phan-Thien-Tanner

W. S. Bezerra, A. Castelo

Abstract


Neste trabalho será investigado o comportamento de escoamentos de fluidos newtonianos e não-newtonianos em microcanais. O problema não-newtoniano, consiste em resolver as equações que regem o movimento para o caso de um escoamento de fluidos cujas propriedades reológicas possam ser estudadas pelo modelo constitutivo de Phan-Thien-Tanner, como por exemplo os materiais poliméricos. Uma das características interessantes de alguns destes materiais é que eles podem ser misturados com solventes apropriados, como uma solução eletrolítica, e o resultado é que este fluido como um todo passa a ter propriedades elétricas. Assim, além das propriedades viscoelásticas, será investigada a eletrocinética do escoamento, que é diretamente influenciado pela aplicação de um campo elétrico externo. Em particular o fenômeno de eletroosmose será estudado por meio de simulações numéricas em canais planos. O movimento das cargas na solução é descrito pelas equações de Poisson-Nernst-Planck e para resolver numericamente este problema será aplicado o método das diferenças finitas generalizadas. O código para as simulações de escoamentos eletroosmóticas foi implementado como uma parte do sistema chamado HiG-Fow.


Keywords


Escoamento eletroosmótico; Fluido viscoelástico; Diferenças finitas

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DOI: https://doi.org/10.5540/tema.2020.021.03.461

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