Numerical analysis of field-modulated electroosmotic flows in microchannels with arbitrary numbers and configurations of discrete electrodes
Numerical analysis of field-modulated electroosmotic flows in microchannels with arbitrary numbers and configurations of discrete electrodes
复制标题
具有任意数量和配置的离散电极的微通道中场调制电渗流的数值分析
DOI：
10.1007/s10544-010-9450-1
复制
发表时间：
2010-12-01
影响因子：
2.8
通讯作者：
Wu, Jiankang
中科院分区：
文献类型：
--
作者：
Chao, Kan;Chen, Bo;Wu, Jiankang
双电层的形成和电渗是微流控系统的重要理论基础。微通道中的场调制电渗流可以通过在垂直于通道壁的方向上施加调制电场来获得。基于液固耦合区域电场的Poisson方程、液体流动的Navier-Stokes方程和离子输运的Nernst-Planck方程，对具有离散电极的微通道内的调制电渗流进行了系统的数值分析。这些方程是非线性耦合的，并同时数值求解的电渗流速，电势，和离子浓度的微通道。本文给出了离散电极微通道中调制电渗流的数值计算实例，包括单电极、对称/非对称双电极和三电极。数值结果表明，通过施加调制电场与不同的电极配置，可以实现混沌循环流动，微涡，和有效的流体混合的微通道。本文还讨论了调制场与外加场沿着沟道的相互作用。
The formation of an electric double layer and electroosmosis are important theoretic foundations associated with microfluidic systems. Field-modulated electroosmotic flows in microchannels can be obtained by applying modulating electric fields in a direction perpendicular to a channel wall. This paper presents a systematic numerical analysis of modulated electroosmotic flows in a microchannel with discrete electrodes on the basis of the Poisson equation of electric fields in a liquid–solid coupled domain, the Navier–Stokes equation of liquid flow, and the Nernst-Planck equation of ion transport. These equations are nonlinearly coupled and are simultaneously solved numerically for the electroosmotic flow velocity, electric potential, and ion concentrations in the microchannel. A number of numerical examples of modulated electroosmotic flows in microchannels with discrete electrodes are presented, including single electrodes, symmetric/asymmetric double electrodes, and triple electrodes. Numerical results indicate that chaotic circulation flows, micro-vortices, and effective fluid mixing can be realized in microchannels by applying modulating electric fields with various electrode configurations. The interaction of a modulating field with an applied field along the channel is also discussed.