Based on the incompressible Navier Stokes equation (N-S) and the coupling principle of laminar flow and electric field, a new 3D electroosmotic micromixer with a variable module is designed in this paper. A microchannel is designed throughout the variable module to improve the mixing efficiency. The mixing efficiency of the electroosmotic micromixer in different directions, different positions, different alternating voltages and different times was studied. It can be seen from the simulation results that under the influence of electric field, the number, size and position of vortexes formed by the fluid in the microchannel are different. When the Reynolds number (Re) < 10, the electroosmotic micromixer shows a good mixing effect. When Re > 10, most of the micromixers with several torsion modes show a rapid downward trend. Different from the other variable methods, when the first variable module is rotated in the YZ plane, the mixing efficiency decreases slowly and changes steadily, and the maximum mixing efficiency can reach 98.89%. The new electroosmosis micromixer has a smaller pressure drop and provides high flexibility for rapid mixing and a very stable high mixing efficiency.

本文基于不可压缩的纳维斯托克斯方程（NS）和层流与电场的耦合原理，设计了一种新型的可变模数3D电渗微混合器。整个可变模块设计了微通道以提高混合效率。研究了电渗微混合器在不同方向、不同位置、不同交流电压和不同时间下的混合效率。从模拟结果可以看出，在电场的影响下，流体在微通道中形成的涡流的数量、大小和位置都不同。当雷诺数( Re ) < 10 时，电渗微混合器表现出良好的混合效果。当再 > 10，大多数具有多种扭转模式的微混合器呈现快速下降趋势。与其他变量方法不同，当第一个变量模块在YZ平面内旋转时，混合效率缓慢下降并稳定变化，最大混合效率可达98.89%。新型电渗微混合器压降更小，为快速混合提供高灵活性和非常稳定的高混合效率。