Studying on the Optimum Frequency of Driving Voltage of Electro-osmotic

3rd International Symposium on Resource Exploration and Environmental Science

生态环境科学

Wang, Chunsheng^1 ; Wu, Shibin^1 ; Shang, Dongxing^1

College of Vehicles and Energy, Yanshan University, Qinhuangdao

066000, China^1

关键词: Electrode gap;    Mixing efficiency;    Optimal frequency;    Optimal mixing;    Optimum frequency;    Physical mechanism;    Residence time;    Voltage amplitude;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/300/4/042094/pdf
DOI  :  10.1088/1755-1315/300/4/042094

学科分类：环境科学（综合）

来源: IOP

【 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.