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Conference Paper: Dispersion Due to Electroosmotic Flow Through a Circular Channel With Non-uniform Zeta Potential and Wall Slip

TitleDispersion Due to Electroosmotic Flow Through a Circular Channel With Non-uniform Zeta Potential and Wall Slip
Authors
Issue Date2013
PublisherHong Kong Society of Theoretical and Applied Mechanics (HKSTAM).
Citation
Proceedings of the 17th Annual Conference of Hong Kong Society of Theoretical and Applied Mechanics (HKSTAM 2013) , the 9th Jiangsu-Hong Kong Forum on Mechanics and Its Application (JSTAM), and the 3rd Symposium on the Development of Mechanics, Hong Kong-Macau, China, 22-23 March 2013, p. 14 How to Cite?
AbstractAbstract: The hydrodynamic dispersion due to steady electro-osmotic flow in a circular channel with longitudinal step changes of zeta potential and hydrodynamic slippage is analyzed in this study. The channel wall is periodically micro-patterned along the axial position with alternating slip-stick stripes of distinct zeta potentials (Fig. 1.). A homogenization analysis is performed in this study to derive the hydrodynamic dispersion coefficient without subject to the long-wave constraint of lubrication approximation. The flow and the hydrodynamic dispersion coefficient are calculated numerically using the packages MATLAB and COMSOL, as functions of controlling parameters including the period length of the wall pattern, the area fraction of the slipping region (EOF-suppressing) in a periodic unit, the ratio of the two zeta potentials, the intrinsic hydrodynamic slip length, the Debye parameter, and the Péclet number. The dispersion coefficient is found to show notable, non-monotonic in certain situations, dependence on these controlling parameters. It is noteworthy that the existence of hydrodynamic slippage will generate much richer behaviors of the hydrodynamic dispersion than the situation with no-slip boundary condition, as slippage interacts with zeta potentials in the either likewise or oppositely charged EOF-suppressing and EOF-supporting regions.
Persistent Identifierhttp://hdl.handle.net/10722/183228

 

DC FieldValueLanguage
dc.contributor.authorZhou, Qen_US
dc.contributor.authorNg, COen_US
dc.date.accessioned2013-05-15T01:49:04Z-
dc.date.available2013-05-15T01:49:04Z-
dc.date.issued2013en_US
dc.identifier.citationProceedings of the 17th Annual Conference of Hong Kong Society of Theoretical and Applied Mechanics (HKSTAM 2013) , the 9th Jiangsu-Hong Kong Forum on Mechanics and Its Application (JSTAM), and the 3rd Symposium on the Development of Mechanics, Hong Kong-Macau, China, 22-23 March 2013, p. 14en_US
dc.identifier.urihttp://hdl.handle.net/10722/183228-
dc.description.abstractAbstract: The hydrodynamic dispersion due to steady electro-osmotic flow in a circular channel with longitudinal step changes of zeta potential and hydrodynamic slippage is analyzed in this study. The channel wall is periodically micro-patterned along the axial position with alternating slip-stick stripes of distinct zeta potentials (Fig. 1.). A homogenization analysis is performed in this study to derive the hydrodynamic dispersion coefficient without subject to the long-wave constraint of lubrication approximation. The flow and the hydrodynamic dispersion coefficient are calculated numerically using the packages MATLAB and COMSOL, as functions of controlling parameters including the period length of the wall pattern, the area fraction of the slipping region (EOF-suppressing) in a periodic unit, the ratio of the two zeta potentials, the intrinsic hydrodynamic slip length, the Debye parameter, and the Péclet number. The dispersion coefficient is found to show notable, non-monotonic in certain situations, dependence on these controlling parameters. It is noteworthy that the existence of hydrodynamic slippage will generate much richer behaviors of the hydrodynamic dispersion than the situation with no-slip boundary condition, as slippage interacts with zeta potentials in the either likewise or oppositely charged EOF-suppressing and EOF-supporting regions.-
dc.languageengen_US
dc.publisherHong Kong Society of Theoretical and Applied Mechanics (HKSTAM).en_US
dc.relation.ispartofAnnual Conference of Hong Kong Society of Theoretical and Applied Mechanics (HKSTAM) & Jiangsu-Hong Kong Forum on Mechanics and Its Application (JSTAM) & the Symposium on the Development of Mechanicsen_US
dc.rightsCreative Commons: Attribution 3.0 Hong Kong License-
dc.titleDispersion Due to Electroosmotic Flow Through a Circular Channel With Non-uniform Zeta Potential and Wall Slipen_US
dc.typeConference_Paperen_US
dc.identifier.emailNg, CO: cong@hku.hken_US
dc.identifier.authorityNg, CO=rp00224en_US
dc.description.naturepublished_or_final_version-
dc.identifier.hkuros214188en_US
dc.identifier.spage14en_US
dc.identifier.epage14en_US
dc.publisher.placeHong Kong, China-

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