File Download
  Links for fulltext
     (May Require Subscription)
Supplementary

Article: Dispersion in electroosmotic flow generated by oscillatory electric field interacting with oscillatory wall potentials

TitleDispersion in electroosmotic flow generated by oscillatory electric field interacting with oscillatory wall potentials
Authors
KeywordsDebye length
Dispersion coefficient
Electric double layer
Electroosmotic flow
Zeta potential
Issue Date2012
PublisherSpringer Verlag. The Journal's web site is located at http://www.springeronline.com/sgw/cda/frontpage/0,11855,5-10027-70-28985103-0,00.html
Citation
Microfluidics And Nanofluidics, 2012, v. 12 n. 1-4, p. 237-256 How to Cite?
AbstractAn analytical study is presented in this article on the dispersion of a neutral solute released in an oscillatory electroosmotic flow (EOF) through a two-dimensional microchannel. The flow is driven by the nonlinear interaction between oscillatory axial electric field and oscillatory wall potentials. These fields have the same oscillation frequency, but with disparate phases. An asymptotic method of averaging is employed to derive the analytical expressions for the steady-flow-induced and oscillatory-flow-induced components of the dispersion coefficient. Dispersion coefficients are functions of various parameters representing the effects of electric double-layer thickness (Debye length), oscillation parameter, and phases of the oscillating fields. The time-harmonic interaction between the wall potentials and electric field generates steady as well as time-oscillatory components of electroosmotic flow, each of which will contribute to a steady component of the dispersion coefficient. It is found that, for a thin electric double layer, the phases of the oscillating wall potentials will play an important role in determining the magnitude of the dispersion coefficient. When both phases are zero (i.e., full synchronization of the wall potentials with the electric field), the flow is nearly a plug flow leading to very small dispersion. When one phase is zero and the other phase is π, the flow will be sheared to the largest possible extent at the center of the channel, and such a sharp velocity gradient will lead to the maximum possible dispersion coefficient. © 2011 The Author(s).
Persistent Identifierhttp://hdl.handle.net/10722/144932
ISSN
2015 Impact Factor: 2.537
2015 SCImago Journal Rankings: 0.852
ISI Accession Number ID
Funding AgencyGrant Number
Research Grants Council of the Hong Kong Special Administrative Region, ChinaHKU 715510E
University of Hong Kong200911159024
Funding Information:

The study was financially supported by the Research Grants Council of the Hong Kong Special Administrative Region, China, through Project No. HKU 715510E, and by the University of Hong Kong through the Seed Funding Programme for Basic Research under Project Code 200911159024. Comments by the referees are gratefully acknowledged. Suvadip Paul is grateful to The Directorate of Higher Education, Government of Tripura, India, for sanctioning leave for this work.

References
Grants

 

DC FieldValueLanguage
dc.contributor.authorPaul, Sen_HK
dc.contributor.authorNg, COen_HK
dc.date.accessioned2012-02-21T05:43:21Z-
dc.date.available2012-02-21T05:43:21Z-
dc.date.issued2012en_HK
dc.identifier.citationMicrofluidics And Nanofluidics, 2012, v. 12 n. 1-4, p. 237-256en_HK
dc.identifier.issn1613-4982en_HK
dc.identifier.urihttp://hdl.handle.net/10722/144932-
dc.description.abstractAn analytical study is presented in this article on the dispersion of a neutral solute released in an oscillatory electroosmotic flow (EOF) through a two-dimensional microchannel. The flow is driven by the nonlinear interaction between oscillatory axial electric field and oscillatory wall potentials. These fields have the same oscillation frequency, but with disparate phases. An asymptotic method of averaging is employed to derive the analytical expressions for the steady-flow-induced and oscillatory-flow-induced components of the dispersion coefficient. Dispersion coefficients are functions of various parameters representing the effects of electric double-layer thickness (Debye length), oscillation parameter, and phases of the oscillating fields. The time-harmonic interaction between the wall potentials and electric field generates steady as well as time-oscillatory components of electroosmotic flow, each of which will contribute to a steady component of the dispersion coefficient. It is found that, for a thin electric double layer, the phases of the oscillating wall potentials will play an important role in determining the magnitude of the dispersion coefficient. When both phases are zero (i.e., full synchronization of the wall potentials with the electric field), the flow is nearly a plug flow leading to very small dispersion. When one phase is zero and the other phase is π, the flow will be sheared to the largest possible extent at the center of the channel, and such a sharp velocity gradient will lead to the maximum possible dispersion coefficient. © 2011 The Author(s).en_HK
dc.languageengen_US
dc.publisherSpringer Verlag. The Journal's web site is located at http://www.springeronline.com/sgw/cda/frontpage/0,11855,5-10027-70-28985103-0,00.htmlen_HK
dc.relation.ispartofMicrofluidics and Nanofluidicsen_HK
dc.rightsThe Author(s)en_US
dc.rightsCreative Commons: Attribution 3.0 Hong Kong Licenseen_US
dc.subjectDebye lengthen_HK
dc.subjectDispersion coefficienten_HK
dc.subjectElectric double layeren_HK
dc.subjectElectroosmotic flowen_HK
dc.subjectZeta potentialen_HK
dc.titleDispersion in electroosmotic flow generated by oscillatory electric field interacting with oscillatory wall potentialsen_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4551/resserv?sid=springerlink&genre=article&atitle=Dispersion in electroosmotic flow generated by oscillatory electric field interacting with oscillatory wall potentials&title=Microfluidics and Nanofluidics&issn=16134982&date=2012-01-01&volume=12&issue=1& spage=237&authors=Suvadip Paul, Chiu-On Ngen_US
dc.identifier.emailNg, CO:cong@hku.hken_HK
dc.identifier.authorityNg, CO=rp00224en_HK
dc.description.naturepublished_or_final_versionen_US
dc.identifier.doi10.1007/s10404-011-0868-4en_HK
dc.identifier.scopuseid_2-s2.0-84856222090en_HK
dc.identifier.hkuros198409-
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-84856222090&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume12en_HK
dc.identifier.issue1-4en_HK
dc.identifier.spage237en_HK
dc.identifier.epage256en_HK
dc.identifier.eissn1613-4990en_US
dc.identifier.isiWOS:000299084300023-
dc.publisher.placeGermanyen_HK
dc.description.otherSpringer Open Choice, 21 Feb 2012en_US
dc.relation.projectElectrohydrodynamic slip flow through a channel with micropatterned surfaces-
dc.identifier.scopusauthoridPaul, S=24473144500en_HK
dc.identifier.scopusauthoridNg, CO=7401705594en_HK
dc.identifier.citeulike9764638-

Export via OAI-PMH Interface in XML Formats


OR


Export to Other Non-XML Formats