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基于微流控动力学理论,应用有限元分析方法求解二维平板粗糙壁面微流道模型内矩形截面双电层场和速度场的耦合控制方程。从数值模拟角度研究不同矩形粗糙元对称分布微流道内的电渗流流动特性,分析了粗糙度对微流体流动的影响机理。结果表明:由于粗糙元的阻力作用,粗糙壁面流道内流体速度减小,引起的压力突变导致壁面附近速度出现波动。随着粗糙元高度、宽度的增加,电渗流流速相应地降低或升高。
Based on the theory of microfluidic dynamics, the coupled governing equations of electric field and velocity field with rectangular cross section in a microchannel model with two-dimensional slab wall are solved by finite element method. The flow characteristics of the electroosmotic flow in the symmetrical distribution microchannels of different rectangular rough elements were studied from the numerical simulation point of view, and the influence mechanism of the roughness on the microfluidic flow was analyzed. The results show that the velocity of the fluid in the rough wall surface decreases due to the resistance of the rough element, and the sudden change in pressure causes the velocity fluctuation in the wall surface. With the increase of roughness height and width, the velocity of electroosmotic flow decreases or increases accordingly.