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|Title:||Electro-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.
|Publisher:||American Institute of Physics|
|Journal:||Physics 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.|
|Access:||Restricted access (Author)|
|Appears in Collections:||IPC - Artigos em revistas científicas internacionais com arbitragem|
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