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TitleElectro-osmotic and pressure-driven flow of viscoelastic fluids in microchannels: analytical and semi-analytical solutions
Author(s)Ferrás, Luís Jorge Lima
Afonso, A. M.
Alves, M. A.
Nóbrega, J. M.
Pinho, F. T.
Issue date2016
PublisherAmerican Institute of Physics
JournalPhysics of Fluids
Abstract(s)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.
AccessRestricted access (Author)
Appears in Collections:IPC - Artigos em revistas científicas internacionais com arbitragem

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