FLOW CHARACTERISTICS OF LIQUID FILMS DRIVEN BY PERIODIC ELECTRO-OSMOSIS IN BIOCHIPS

Tang Wenyue; Hu Guohui

doi:10.6052/0459-1879-2012-3-20120317

Volume 44 Issue 3

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Tang Wenyue, Hu Guohui. FLOW CHARACTERISTICS OF LIQUID FILMS DRIVEN BY PERIODIC ELECTRO-OSMOSIS IN BIOCHIPS[J]. Chinese Journal of Theoretical and Applied Mechanics, 2012, (3): 600-606. doi: 10.6052/0459-1879-2012-3-20120317

Citation:

Tang Wenyue, Hu Guohui. FLOW CHARACTERISTICS OF LIQUID FILMS DRIVEN BY PERIODIC ELECTRO-OSMOSIS IN BIOCHIPS[J]. Chinese Journal of Theoretical and Applied Mechanics, 2012, (3): 600-606. doi: 10.6052/0459-1879-2012-3-20120317

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FLOW CHARACTERISTICS OF LIQUID FILMS DRIVEN BY PERIODIC ELECTRO-OSMOSIS IN BIOCHIPS

doi: 10.6052/0459-1879-2012-3-20120317

Shanghai Institute of Applied Mathematics and Mechanics, Shanghai University, Shanghai 200072, China

Funds: The project was supported by the National Natural Science Foundation of China (10872122), Science and Technology Commission of Shanghai Municipality (10dz2212600), Ph.D. Programs Foundation of Ministry of Education of China (20103108110004) andProgram for Changjiang Scholars and Innovative Research Team in University (IRT0844)

Received Date: 2011-01-28
Rev Recd Date: 2011-09-09
Publish Date: 2012-05-18

Abstract

Abstract

The flow of a thin film on a solid substrate driven by periodic electro-osmosis is studied in the present paper. To describe the relation between potential of electric double layer and charge density, the Poisson-Boltzmann equation is utilized under the Debye-Hückel approximation. An analytical solution for the film is obtained by solving the periodic electro-osmosis driven system, coupling with the Navier-Stokes equation for incompressible viscous fluid. Results indicate that amplitude of the flow velocity in the thin film strongly depends on the Reynolds number, i.e., the amplitude decreases as the Reynolds number increasing. The influence of the ζ potential, as well as the viscosity, is also analyzed on the flow velocity at the free surface and phase difference of the oscillating velocity.
- electric double layer,
- free surface,
- periodical electro-osmosis,
- Reynolds number

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References(24)

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