摘要
在通道壁面垂直施加一个调控电场可以改变双电层电荷密度和Zeta电位势,实现对电渗流的调控。采用电场Poisson方程、动量守恒的Navier-Stokes方程、电解质离子输运的Nernst-Planck方程和液体混合反应的组分浓度输运方程,本文对微通道壁面离散布置调控电极的情况进行了数值分析。数值算例包括单电极、双电极和三电极。研究结果表明:适当放置离散电极对电渗流进行调控,可以在流场中产生微型涡流实现液体的有效混合。
Electroosmotic flows in microchannels can be modulated by applying controllable electric fields perpendicular to channel wall.This paper presented systematic numerical analysis of modulated electroosmotic flows in microchannel with arbitrarily discrete electrodes based on Poisson equation of electric filed in liquid-solid coupled domain,Navier-Stokes equation of liquid flow and Nernst-Planck equation of electrolyte ion transport.A number of numerical examples of modulated electroosmotic flows in microchannels with discrete electrodes were presented,including single-electrode,double-electrodes and triple-electrodes.Numerical results indicated that chaotic circulation flows,micro-vortices and effective fluid mixing can be realized in microchannels by modulating electric fields with optimal discrete electrodes.
出处
《分析科学学报》
CAS
CSCD
北大核心
2011年第1期11-15,共5页
Journal of Analytical Science
基金
国家自然科学基金(No.10872076
50805059)
关键词
调控电渗流
双电层
流体混合
Modulated electroosmotic flow
Electric double layer
Fluid mixing
