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.
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June 2015
Research Article|
June 19 2015
Electroosmosis of viscoelastic fluids over charge modulated surfaces in narrow confinements
Uddipta Ghosh
;
Uddipta Ghosh
Department of Mechanical Engineering,
Indian Institute of Technology
, Kharagpur, West Bengal 721302, India
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Suman Chakraborty
Suman Chakraborty
Department of Mechanical Engineering,
Indian Institute of Technology
, Kharagpur, West Bengal 721302, India
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Physics of Fluids 27, 062004 (2015)
Article history
Received:
August 21 2014
Accepted:
June 02 2015
Citation
Uddipta Ghosh, Suman Chakraborty; Electroosmosis of viscoelastic fluids over charge modulated surfaces in narrow confinements. Physics of Fluids 1 June 2015; 27 (6): 062004. https://doi.org/10.1063/1.4922585
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