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Author(s): Ferras, LL
Afonso, AM
Alves, MA
Nobrega, JM
F. T. Pinho
Title: Electro-osmotic and pressure-driven flow of viscoelastic fluids in microchannels: Analytical and semi-analytical solutions
Issue Date: 2016
Abstract: In this work, we present a series of solutions for combined electro-osmotic and pressure-driven flows of viscoelastic fluids in microchannels. The solutions are semi-analytical, a feature made possible by the use of the Debye-Huckel approximation for the electrokinetic fields, thus restricted to cases with small electric double-layers, in which the distance between the microfluidic device walls is at least one order of magnitude larger than the electric double-layer thickness. To describe the complex fluid rheology, several viscoelastic differential constitutive models were used, namely, the simplified Phan-Thien-Tanner model with linear, quadratic or exponential kernel for the stress coefficient function, the Johnson-Segalman model, and the Giesekus model. The results obtained illustrate the effects of the Weissenberg number, the Johnson-Segalman slip parameter, the Giesekus mobility parameter, and the relative strengths of the electro-osmotic and pressure gradient-driven forcings on the dynamics of these viscoelastic flows. Published by AIP Publishing.
Related Information: info:eu-repo/grantAgreement/FCT - Fundação para a Ciência e Tecnologia/P2020|COMPETE - Projetos em Todos os Domínios Científicos/PTDC/EMS-ENE/3362/2014 - POCI-01-0145-FEDER-016665/Aproximações multi-escala para moldação por injeção de materiais plásticos/MOLDPRO
Document Type: Artigo em Revista Científica Internacional
Rights: restrictedAccess
Appears in Collections:FEUP - Artigo em Revista Científica Internacional

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