Electroosmosis of viscoelastic fluids over charge modulated surfaces in narrow confinements

In the present work, we attempt to analyze the electroosmotic flow of a viscoelastic fluid, following quasi-linear constitutive behavior, over charge modulated surfaces in narrow confinements. We obtain analytical solutions for the flow field for thin electrical double layer (EDL) limit through asym...

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Bibliographic Details
Published inPhysics of fluids (1994) Vol. 27; no. 6
Main Authors Ghosh, Uddipta, Chakraborty, Suman
Format Journal Article
LanguageEnglish
Published Melville American Institute of Physics 01.06.2015
Subjects
Asymptotic series
Deborah number
Electrokinetics
Fluid dynamics
Newtonian fluids
Periodic variations
Physics
Slip velocity
Viscoelastic fluids
Viscoelasticity
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Summary:In the present work, we attempt to analyze the electroosmotic flow of a viscoelastic fluid, following quasi-linear constitutive behavior, over charge modulated surfaces in narrow confinements. We obtain analytical solutions for the flow field for thin electrical double layer (EDL) limit through asymptotic analysis for small Deborah numbers. We show that a combination of matched and regular asymptotic expansion is needed for the thin EDL limit. We subsequently determine the modified Smoluchowski slip velocity for viscoelastic fluids and show that the quasi-linear nature of the constitutive behavior adds to the periodicity of the flow. We also obtain the net throughput in the channel and demonstrate its relative decrement as compared to that of a Newtonian fluid. Our results may have potential implications towards augmenting microfluidic mixing by exploiting electrokinetic transport of viscoelastic fluids over charge modulated surfaces.
ISSN:1070-6631
1089-7666
DOI:10.1063/1.4922585