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Article: Electroosmotic flow of a power-law fluid through an asymmetrical slit microchannel with gradually varying wall shape and wall potential

TitleElectroosmotic flow of a power-law fluid through an asymmetrical slit microchannel with gradually varying wall shape and wall potential
Authors
Issue Date2015
PublisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/colsurfa
Citation
Colloids and Surfaces A: Physicochemical and Engineering Aspects, 2015, v. 472, p. 26-37 How to Cite?
AbstractThis study aims to investigate electroosmotic flow of a power-law fluid through a slit channel with walls asymmetrically patterned with periodic variations in shape and zeta potential. On taking into account the near-wall depletion layer, the present problem is simplified on the basis of the lubrication approximation, and through the use of the Helmholtz–Smoluchowski slip boundary condition. Nonlinear equations are to be solved for two unknown functions of axial dependence, one being the induced pressure gradient, and another being an undetermined stress component. An efficient numerical scheme is devised in this work to solve the nonlinear problem. Results are generated to check whether the principle of linear superposition of forces, for electrokinetic flow of a non-Newtonian fluid in the presence of a Newtonian depletion layer, is still applicable to flow in an asymmetric channel. It is also found that phase shifts between the geometrical and electric potential patterns on the two walls may lead to qualitatively disparate effects, depending on the power-law behavior index of the fluid and the applied pressure gradient.
Persistent Identifierhttp://hdl.handle.net/10722/208695
ISSN
2015 Impact Factor: 2.76
2015 SCImago Journal Rankings: 0.831

 

DC FieldValueLanguage
dc.contributor.authorQi, C-
dc.contributor.authorNg, CO-
dc.date.accessioned2015-03-18T09:05:03Z-
dc.date.available2015-03-18T09:05:03Z-
dc.date.issued2015-
dc.identifier.citationColloids and Surfaces A: Physicochemical and Engineering Aspects, 2015, v. 472, p. 26-37-
dc.identifier.issn0927-7757-
dc.identifier.urihttp://hdl.handle.net/10722/208695-
dc.description.abstractThis study aims to investigate electroosmotic flow of a power-law fluid through a slit channel with walls asymmetrically patterned with periodic variations in shape and zeta potential. On taking into account the near-wall depletion layer, the present problem is simplified on the basis of the lubrication approximation, and through the use of the Helmholtz–Smoluchowski slip boundary condition. Nonlinear equations are to be solved for two unknown functions of axial dependence, one being the induced pressure gradient, and another being an undetermined stress component. An efficient numerical scheme is devised in this work to solve the nonlinear problem. Results are generated to check whether the principle of linear superposition of forces, for electrokinetic flow of a non-Newtonian fluid in the presence of a Newtonian depletion layer, is still applicable to flow in an asymmetric channel. It is also found that phase shifts between the geometrical and electric potential patterns on the two walls may lead to qualitatively disparate effects, depending on the power-law behavior index of the fluid and the applied pressure gradient.-
dc.languageeng-
dc.publisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/colsurfa-
dc.relation.ispartofColloids and Surfaces A: Physicochemical and Engineering Aspects-
dc.rightsNOTICE: this is the author’s version of a work that was accepted for publication in Colloids and Surfaces A: Physicochemical and Engineering. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Colloids and Surfaces A: Physicochemical and Engineering Aspects, 2015, v. 472, p. 26-37. DOI: 10.1016/j.colsurfa.2015.02.039-
dc.rightsCreative Commons: Attribution 3.0 Hong Kong License-
dc.titleElectroosmotic flow of a power-law fluid through an asymmetrical slit microchannel with gradually varying wall shape and wall potential-
dc.typeArticle-
dc.identifier.emailNg, CO: cong@hku.hk-
dc.identifier.authorityNg, CO=rp00224-
dc.description.naturepostprint-
dc.identifier.doi10.1016/j.colsurfa.2015.02.039-
dc.identifier.hkuros242720-
dc.identifier.volume472-
dc.identifier.spage26-
dc.identifier.epage37-
dc.publisher.placeNetherlands-

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