Micro-mixers, due to their vast applications in different fields have been of great interest to the researchers in recent years. In this study, a transient two-dimensional solver was developed in the open-source code, OpenFOAM to simulate electrothermal effect in a micro mixer. Then, as the first step, the obtained mixing quality and fluid velocity of three different geometries with various electrode arrangements were compared. According to the results, the micromixer with a trapezoidal chamber and a circular cavity has the highest mixing and pumping efficiency. Then, in the selected micromixer, the effect of different parameters was studied such as voltage, electrode heating, electrical conductivity and size of electrode installed on the cavity and channel. The results showed that, in some phase differences, increasing the voltage improves the quality of mixing, and in others, it has an inverse effect. In addition, it is found that increasing size of electrodes in the cavity, decreases the fluid velocity and increases the mixing quality. Finally, by increasing voltage on different electrodes, a remarkable micro-mixer with a mixing quality of 99 % and an average fluid velocity of 64 μm/s was obtained.

近年来，由于微型混合器在不同领域的广泛应用，引起了研究人员的极大兴趣。在这项研究中，在开源代码OpenFOAM中开发了一个瞬态二维求解器，以模拟微型混合器中的电热效应。然后，作为第一步，比较了具有不同电极布置的三种不同几何形状的混合质量和流体速度。根据结果​​，具有梯形腔和圆形腔的微型混合器具有最高的混合和泵送效率。然后，在所选的微型混合器中，研究了不同参数的影响，例如电压，电极加热，电导率以及安装在腔体和通道上的电极尺寸。结果表明，在某些相位差异下，增大电压可以改善混合质量，在其他情况下，则具有相反的作用。另外，发现增加空腔中电极的尺寸，降低流体速度并提高混合质量。最后，通过增加不同电极上的电压，获得了卓越的微混合器，其混合质量为99％，平均流体速度为64μm/ s。