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

Zhang, Yonghao and Gu, X.J. and Barber, Robert W. and Emerson, David (2005) Influence of the electric double layer on induced pressure fields and development lengths in electro-osmotic flows. Modern Physics Letters B, 19 (28-29). pp. 1655-1658. ISSN 0217-9849

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    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.

    Item type: Article
    ID code: 6977
    Keywords: engineering, microfluidics, electro-osmotic flow, induced pressure, entrance effects, Mechanical engineering and machinery, Physics
    Subjects: Technology > Mechanical engineering and machinery
    Science > Physics
    Department: Faculty of Engineering > Mechanical and Aerospace Engineering
    Related URLs:
      Depositing user: Strathprints Administrator
      Date Deposited: 18 Sep 2008
      Last modified: 19 Jun 2014 21:16
      URI: http://strathprints.strath.ac.uk/id/eprint/6977

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