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首页> 外文期刊>Physica Scripta: An International Journal for Experimental and Theoretical Physics >Mass transport and separation of species in an oscillating electro-osmotic flow caused by distinct periodic electric fields
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Mass transport and separation of species in an oscillating electro-osmotic flow caused by distinct periodic electric fields

机译：不同周期电场引起的振荡电渗流中的大规模运输和物种的分离

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摘要

In this work, we theoretically analyze how a passive solute is transported by an oscillating electro-osmotic flow along a parallel flat plate microchannel connecting two reservoirs with different concentrations. Three distinct periodic functions of the applied external electric field are considered: sawtooth, square, and parabolic waveforms, which are expressed as Fourier series. For each case, the dimensionless velocity and concentration fields are found analytically and, subsequently, the transport of the solute was obtained numerically. We distinguish four dimensionless parameters that govern the studied phenomenon: an angular Reynolds number, the Schmidt and Peclet numbers, and an electrokinetic parameter, this latter representing the ratio of the half-height of the microchannel to the Debye length. As has been reported in the specialized literature, the mass transport and separation of species in oscillating flows under the effect of an oscillatory pressure gradient can be increased with the angular frequency. For the present study, instead of a pressure gradient, we use oscillatory electro-osmotic forces, together with symmetric and asymmetric wall zeta potentials in the microchannel. For this condition, we prove that the transport of the solute is affected notably. In this paper, we show that controlling the type of the external electrical signal can also improve the mentioned tasks, depending on the Schmidt number, the electrokinetic parameter, and the angular Reynolds number.
机译：在这项工作中，我们理论上分析了沿着连接两个具有不同浓度的两个储存器的平行平板微通道的振荡电渗透流动如何通过振荡电渗透流量来运输。应用外部电场的三个不同的周期性函数被认为是：锯齿，平方和抛物线波形，其表示为傅立叶系列。对于每种情况，在分析上发现无量纲速度和浓度场，随后，在数值上获得溶质的运输。我们区分了四维比参数，该参数控制所研究的现象：角度雷诺数，施密特和Peclet号，以及电动参数，该后者表示微通道的半高度与德义长度的比率。如在专业文献中报道的，可以随着角度频率提高振荡压力梯度效果下振荡流量的质量运输和分离。对于本研究，我们使用振荡电渗透力而不是压力梯度，以及微通道中的对称和不对称壁Zeta电位。对于这种情况，我们证明了溶质的运输受到显着影响。在本文中，我们示出了控制外部电信号的类型还可以改善所提到的任务，这取决于施密特数，电动参数和角雷诺数。

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