School of Mechanical and Aerospace Engineering, Nanyang Technological University, Singapore, Republic of Singapore.
Electrophoresis. 2012 Mar;33(6):899-980. doi: 10.1002/elps.201100564.
We present an analysis of the electro-osmotic flow of electrolytic solutions in a microchannel with patterned hydrodynamic slippage on channel walls. A set of governing equations is formulated to account for the effects of small variations in hydrodynamic slippage over the microchannel walls on the electro-osmotic flow. These equations are then solved analytically by using the perturbation method. Two frequently encountered surface patterns, (i) cosine wave variation and (ii) square wave variation in slip length, are considered in our analyses. The results show that patterned slippage over microchannel walls can induce complex flow patterns (such as vortical flows) in otherwise plug-like electro-osmotic flows, which suggests potential applications of such flows in microfluidic mixers.
我们分析了带有壁面图案化滑移的微通道中电解质溶液的电渗流动。建立了一组控制方程来考虑微通道壁面上滑移的小变化对电渗流动的影响。然后通过使用摄动法对这些方程进行了分析。在我们的分析中考虑了两种常见的表面图案，（i）滑移长度的余弦波变化和（ii）方波变化。结果表明，微通道壁面的图案化滑移会在原本呈塞状的电渗流动中产生复杂的流动模式（如涡旋流动），这表明这种流动在微混合器中有潜在的应用。
