Steric effect and slip-modulated energy transfer in narrow fluidic channels with finite aspect ratios

In this study, we delineate the combined consequences of finite channel aspect ratios, wall slip effects and steric interactions on the energy transfer mechanisms in narrow fluidic confinements. By considering the details of ionic interactions within the electrical double layer, we demonstrate that...

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Bibliographic Details
Published in:Electrophoresis 2010-03, Vol.31 (5), p.843-849
Main Authors: Garai, Anirban, Chakraborty, Suman
Format: Article
Language:English
Subjects:
Algorithms
Aspect ratio
Channels
Density
Electrical double layer
Electrochemistry
Electrophoresis
Energy conversion
Energy transfer
Fluidics
Mathematical analysis
Microfluidic Analytical Techniques - methods
Models, Chemical
Molecular Conformation
Slip
Steric effect
Steric effects
Streaming potential
Viscosity
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Summary:In this study, we delineate the combined consequences of finite channel aspect ratios, wall slip effects and steric interactions on the energy transfer mechanisms in narrow fluidic confinements. By considering the details of ionic interactions within the electrical double layer, we demonstrate that considerations of finite aspect ratios and steric effects may result in dramatic alterations in the predictions of effective viscosity as well as the energy transfer efficiency, particularly for high magnitudes of the surface charge density, as compared with the predictions based on parallel plate channel considerations. We also illustrate the possibilities of obtaining very high energy transfer efficiencies by employing channels of aspect ratios close to unity, with a judicious exploitation of steric interactions and wall slippage effects in highly confined geometries.
ISSN:0173-0835
1522-2683
DOI:10.1002/elps.200900676