毛细管电渗流微泵的流体动力学的数值仿真  

HYDRODYNAMIC ANALYSIS OF ELECTROOSMOTIC FLOW IN MICROPUMP

作　　者：仲武[1] 陈云飞[1] 

机构地区：[1]东南大学机械系,南京210096

出　　处：《机械工程学报》2004年第2期73-77,共5页Journal of Mechanical Engineering

基　　金：国家自然科学基金(50276011);江苏省自然科学基金(BK2002060)资助项目

摘　　要：利用电渗流(EOF:Electroosmotic flow)机理制作出的微泵,以其体积小、噪声低、易于控制和结构简单等优点,在药物输送、生化合成及微机电系统(MEMS)中得到了广泛的应用。以实现CPU的温度控制为目标,对电渗流泵的控制及速度、压力间的关系进行了分析。应用无网格法(Meshless/meshfree)对Laplace方程、Poisson-Boltzmann方程、Navier-Stokes方程进行数值求解。数学模型不仅可以仿真几何形状简单的直管内微流体的驱动过程,也可以仿真几何形状复杂、ζ电势较大条件下的微流体的流动情况,为电渗流泵的设计提供了仿真模型。主要讨论通过改变外加垂直电势和ζ电势,实现对电渗流泵的控制以及电渗流泵所能承受的背压问题。With the use of electroosmotic flow as the driving fluid, electroosmotic micro-pump has a wide applications in micro-electronic-mechanical system (MEMS), medical transport and bio-chemical synthesize in the recent years by the virtue of no moving parts, low noise, and simple construction. Mathematical models are set up for the electroosmotic pump. The meshless algorithm is used to solve the Laplace equation, Poisson-Boltzmann equation and Navier-Stokes equations. Microflow of liquids in the micro-pump with complex geometrical shapes and with large ζ potential is analyzed. More attention is paid on the control of the back-pressure in electroosmotic flow pump through designing the external voltage and ζ potential.

关 键 词：流体动力学 毛细管电渗流微泵 数值仿真 LAPLACE方程 POISSON-BOLTZMANN方程 NAVIER-STOKES方程 

分 类 号：O351.2[理学—流体力学]