Influence of the electric double layer on induced pressure fields and development lengths in electro-osmotic flows

Yonghao Zhang, Xiao-Jun Gu, Robert W. Barber, David R. Emerson

Research output: Contribution to journalArticle

Abstract

Electro-osmotic flow can be used as an efficient pumping mechanism in microfluidic devices. For this type of flow, frictional losses at the entrance and exit can induce an adverse longitudinal pressure distribution that can lead to dispersive effects. The present study describes a numerical investigation of the influence of the electric double layer on the induced pressure field and the flow development length. The induced pressure gradient is affected by the volumetric flow rate, fluid viscosity and the channel height. When the electric double layer is small, the development length remains constant at 0.57 of the channel height but decreases as the double layer grows in thickness.
LanguageEnglish
Pages1655-1658
Number of pages4
JournalModern Physics Letters B
Volume19
Issue number28-29
DOIs
Publication statusPublished - 20 Dec 2005

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pressure distribution
microfluidic devices
pressure gradients
entrances
pumping
flow velocity
viscosity
fluids

Keywords

  • engineering
  • microfluidics
  • electro-osmotic flow
  • induced pressure
  • entrance effects

Cite this

Zhang, Yonghao ; Gu, Xiao-Jun ; Barber, Robert W. ; Emerson, David R. / Influence of the electric double layer on induced pressure fields and development lengths in electro-osmotic flows. In: Modern Physics Letters B. 2005 ; Vol. 19, No. 28-29. pp. 1655-1658.
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Influence of the electric double layer on induced pressure fields and development lengths in electro-osmotic flows. / Zhang, Yonghao; Gu, Xiao-Jun; Barber, Robert W.; Emerson, David R.

In: Modern Physics Letters B, Vol. 19, No. 28-29, 20.12.2005, p. 1655-1658.

Research output: Contribution to journalArticle

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