期刊名称：IOP Conference Series: Earth and Environmental Science
印刷版ISSN：1755-1307
电子版ISSN：1755-1315
出版年度：2019
卷号：300
期号：4
页码：1-8
DOI：10.1088/1755-1315/300/4/042094
出版社：IOP Publishing
摘要：Electro-osmotic actuation is an effective method of mixing micro-scale fluids. In this paper, an annular micro-channel mixing model, in which electro-osmosis are used to mix fluids, is established to simulate fluid mixing condition. Simulation results show that for fixed flow parameters, there is a supply frequency that can optimize the mixing efficiency. As the frequency increases, the mixing efficiency increases firstly and then decreases. The optimal mixing efficiency is about 95% at the frequency of 25 Hz. Furthermore, the influence of flow velocity, electrode position and voltage amplitude on the optimal frequency is proposed, and the physical mechanisms are discussed. Numerical analysis shows the electro-osmotic of electric field can produce a vortex, which can increase the mixing efficiency in micro-channels effectively. The mixing efficiency can be improved by increasing voltage amplitude and the electrode gap. When the velocity of fluids increases, the residence time of particles decreases, the frequency of optimization will increase accordingly.
