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Dispersion in oscillatory electro-osmotic flow through a parallel-plate channel with kinetic sorptive exchange at walls

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Abstract

Dispersion in time-oscillatory electro-osmotic flows in a slit micro-channel under the effect of kinetic sorptive exchange at walls is theoretically investigated using the homogenization method. The two walls of the channel are considered to be made up of different materials, and therefore have different zeta potentials and sorption coefficients. A general expression for the Taylor dispersion coefficient under different zeta potentials as well as various sorption conditions at the walls is derived analytically. The dispersion coefficient is found to be dependent on the oscillation frequency, the Debye parameter, the species partition coefficient, the reaction kinetics and the ratio of the wall potentials. The results demonstrate that the presence of wall sorption tends to enhance the dispersion when the oscillation frequency is low, but the effect is negligible in high-frequency oscillatory flows. Moreover, it is found that the dispersion coefficient could be significantly changed by adjusting the relative wall potentials for low-frequency flows.

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Authors and Affiliations

  1. School of Civil and Environmental Engineering, Nanyang Technological University, Singapore, 639798, Singapore

    Jie Song & Wing-Keung Adrian Law

  2. Department of Mechanical Engineering, The University of Hong Kong, Hong Kong, China

    Chiu-On Ng  (吴朝安)

Authors
  1. Jie Song
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  2. Chiu-On Ng  (吴朝安)
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  3. Wing-Keung Adrian Law
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Corresponding author

Correspondence to Chiu-On Ng  (吴朝安).

Additional information

Project supported by the Research Grants Council of the Hong Kong Special Administrative Region, China (Grant No. HKU 715510E).

Biography: SONG Jie (1988-), Female, Ph. D. Candidate

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Song, J., Ng, CO. & Law, WK.A. Dispersion in oscillatory electro-osmotic flow through a parallel-plate channel with kinetic sorptive exchange at walls. J Hydrodyn 26, 363–373 (2014). https://doi.org/10.1016/S1001-6058(14)60041-X

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  • DOI: https://doi.org/10.1016/S1001-6058(14)60041-X

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