Shear banding and interfacial instability in planar Poiseuille flow |
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| Authors: | Suzanne M Fielding Helen J Wilson |
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| Institution: | 1. Departamento de Matemática e Computação, Universidade Estadual Paulista “Júlio de Mesquita Filho”, Rua Roberto Simonsen, 305, Presidente Prudente 19060-900, Brazil;2. Instituto de Aeronáutica e Espaço, Praça Marechal Eduardo Gomes, 50, São José dos Campos 12228-904, Brazil;3. Departamento de Matemática Aplicada e Estatística, Universidade de São Paulo, Avenida Trabalhador São-carlense, 400, São Carlos 13566-590, Brazil;1. CEFT, Departamento de Engenharia Mecânica, Faculdade de Engenharia da Universidade do Porto, Rua Dr. Roberto Frias, 4200-465 Porto, Portugal;2. CEFT, Departamento de Engenharia Química, Faculdade de Engenharia da Universidade do Porto, Rua Dr. Roberto Frias, 4200-465 Porto, Portugal |
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| Abstract: | Motivated by the need for a theoretical study in a planar geometry that can easily be implemented experimentally, we study the pressure driven Poiseuille flow of a shear banding fluid. After discussing the “basic states” predicted by a one-dimensional calculation that assumes a flat interface between the bands, we proceed to demonstrate such an interface to be unstable with respect to the growth of undulations along it. We give results for the growth rate and wavevector of the most unstable mode that grows initially, as well as for the ultimate flow patterns to which the instability leads. We discuss the relevance of our predictions to the present state of the experimental literature concerning interfacial instabilities of shear banded flows, in both conventional rheometers and microfluidic channels. |
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