作　　者： ; ; ;

机构地区： 吉林大学机械科学与工程学院

出　　处： 《机械工程学报》 2007年第3期37-42,共6页

摘　　要： 针对电渗泵的设计参数优化问题,建立电渗驱动流的数学模型,应用有限控制容积法对矩形流道断面上双电层场和速度场的耦合控制方程进行数值求解。详尽分析流道断面深宽比、流道当量直径、电解质溶液浓度和外加电场强度对电势、速度和流量的影响,并给出电渗流量和平均速度与影响因素之间的拟合公式。仿真结果表明:流量随流道深宽比的增大而减小,当流道深宽比为1时,流量最小;流量随流道当量直径的平方增加;平均速度与电解质溶液浓度和外加电场强度有关、与流道深宽比和当量直径的大小基本无关。 Aiming at the design parameter optimization problem of the electroosmotic pumping, the mathematic model of electroosmotic flow is made. The coupling equations governing the electric double layer （EDL） field and the velocity field in the cross-section of rectangular microchannels are numerically solved by employing a finite control volume scheme. The dependence of the potential, velocity and volumetric flowrate on the aspect ratio, hydraulic diameter, liquid properties and the applied electrical field is analyzed. And the fitting polynomials of the relationships between the volumetric flow, average velocity and influence factors are presented. The numerical simulation results show that the volumetric flowrate decreases as the aspect ratio increases. When the aspect ratio approaches 1, the volumetric flowrate is minimum. The volumetric flowrate increased with the square of hydraulic diameter. The average velocity is dependent on the ionic concentration and the applied electrical field strength. However, the aspect ratio and hydraulic diameter have little impact on the average velocity.

关 键 词： 电渗流 影响因素 有限控制容积法 矩形微流道 数值模拟

领　　域： [理学] [理学] [化学工程]