Modeling of electroosmotic nanoflows with overlapped double layer

Reza Nosrati, Mehrdad Raisee, Ahmad Nourbakhsh

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Abstract

In the present paper a new model is proposed for electric double layer (EDL) overlapped in nanochannels. The model aimed to obtain a deeper insight of transport phenomena in nanoscale. Two-dimensional Nernst and ionic conservation equations are used to obtain electroosmotic potential distribution in flow field. In the proposed study, transport equations for flow, ionic concentration and electroosmotic potential are solved numerically via finite volume method. Moreover, Debye-Hückle (DH) approximation and symmetry condition, which limit the application, are avoided. Thus, the present model is suitable for prediction of electroosmotic flows through nanochannels as well as complicated asymmetric geometries with large nonuniform zeta potential distribution. For homogeneous zeta potential distribution, it has been shown that by reduction of channel height to values comparable with EDL thickness, Poisson-Boltzmann model produces inaccurate results and must be avoided. Furthermore, for overlapped electric double layer in nanochannels with heterogeneous zeta potential distribution it has been found that the present model returns modified ionic concentration and electroosmotic potential distribution compare to previous EDL overlapped models due to 2D solution of ionic concentration distribution. Finally, velocity profiles in EDL overlapped nanochannels are investigated and it has been showed that for pure electroosmotic flow the velocity profile deviates from the expected plug-like profile towards a parabolic profile.

Original languageEnglish
Title of host publicationConference on Nanochannels, Microchannels, and Minichannels ICNMM2011
Place of PublicationNew York USA
PublisherAmerican Society of Mechanical Engineers (ASME)
Pages265-276
Number of pages12
Volume2
ISBN (Print)9780791844649
DOIs
Publication statusPublished - 1 Dec 2011
Externally publishedYes
EventInternational Conference on Nanochannels, Microchannels and Minichannels (ICNMM) 2011 - Edmonton Alberta, Canada
Duration: 19 Jun 201122 Jun 2011
Conference number: 9th
http://proceedings.asmedigitalcollection.asme.org/volume.aspx?volumeid=15128 (Vol 1 - Proceedings)
http://proceedings.asmedigitalcollection.asme.org/volume.aspx?volumeid=15131 (Vol 2 - Proceedings)

Conference

ConferenceInternational Conference on Nanochannels, Microchannels and Minichannels (ICNMM) 2011
Abbreviated titleICNMM 2011
CountryCanada
CityEdmonton Alberta
Period19/06/1122/06/11
Internet address

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