Ramos A, González A, Castellanos A, Green N G, Morgan H
Departamento de Electrónica y Electromagnetismo, University of Seville, Avenida Reina Mercedes s/n, 41012 Seville, Spain.
Phys Rev E Stat Nonlin Soft Matter Phys. 2003 May;67(5 Pt 2):056302. doi: 10.1103/PhysRevE.67.056302. Epub 2003 May 9.
The net flow of electrolyte induced by an ac electric potential applied to an array of asymmetric pairs of microelectrodes has recently been reported. The interaction between the oscillating electric field and the oscillating induced charge at the diffuse double layer on the electrodes results in a steady electro-osmotic velocity distribution on top of the electrodes. This slip velocity distribution is anisotropic and produces a net flow of fluid. This paper presents a theoretical analysis of the pumping phenomena based upon an electro-osmotic model in ac fields. The electrical equations are solved numerically using the charge simulation method. The bulk flow generated by the electro-osmotic slip velocity is calculated. The dependence of the fluid flow on voltage and frequency is described and compared to experiments.
最近有报道称，施加于不对称微电极对阵列的交流电势会引起电解质的净流动。振荡电场与电极上扩散双电层处的振荡感应电荷之间的相互作用，导致电极上方出现稳定的电渗速度分布。这种滑移速度分布是各向异性的，并产生流体的净流动。本文基于交流电场中的电渗模型，对泵送现象进行了理论分析。使用电荷模拟方法对电方程进行数值求解。计算了由电渗滑移速度产生的总体流动。描述了流体流动对电压和频率的依赖性，并与实验结果进行了比较。
