疏水表面微通道交变电场电渗流数值模拟
张磊
（青海大学 机械工程学院，青海 西宁 810016）
摘要：基于有限元方法，针对具有特定滑移长度的疏水表面微通道，建立了控制方程，对交变电场电渗流进行了数值模拟，分析了电场强度、电场频率、微通道高度和溶液浓度等对电渗流的影响。结果显示，疏水表面和亲水表面微通道交变电场电渗流具有相似的速度分布，疏水表面微通道交变电场电渗流整体速度更大；双电层滑移速度与电场强度成正比，由于边界滑移，疏水表面微通道交变电场电渗流双电层滑移速度随溶液浓度增大先缓慢减小后迅速增大。
关键词：疏水表面；微通道；交变电场；电渗流；数值模拟
中图分类号：TB126 文献标志码：A doi：10.3969/j.issn.1006-0316.2015.09.002
文章编号：1006－0316 (2015) 09－0005－06
Numerical simulation of AC electroosmotic flow in hydrophobic surface microchannels
ZHANG Lei
( School of Mechanical Engineering, Qinghai University, Xining 810016, China )
Abstract：The governing equations were made in view of hydrophobic surface microchannels with a particular slip length, and numerical simulation of AC electroosmotic flow (EOF) based on the finite element method. The effects of electric strength, electric frequency, microchannel height and solution concentration on EOF were analyzed. The results show that velocity distribution of AC EOF are similar in hydrophobic and hydrophilic microchannels, the velocity of AC EOF in hydrophobic microchannel is bigger, the slip velocity of electric double layer is proportional to electric strength. Because of the boundary slip, with the increase of the solution concentration, the slip velocity of electric double layer in hydrophobic microchannel slowly decreases first and then increases rapidly.
Key words：hydrophobic surface；microchannels；ac electric field；electroosmotic flow（EOF）；numerical simulation
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收稿日期：2015－02－27
作者简介：张磊（1982－），男，陕西乾县人，硕士，讲师，主要研究方向为微机电系统及有限元分析、复合材料加工及仿真。
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