Open AccessStudying on the Optimum Frequency of Driving Voltage of Electro-osmotic
Author(s) -
Wang Chun-sheng,
Shibin Wu,
Dongxing Shang
Publication year - 2019
Publication title -
iop conference series. earth and environmental science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.179
H-Index - 26
eISSN - 1755-1307
pISSN - 1755-1315
DOI - 10.1088/1755-1315/300/4/042094
Subject(s) - mixing (physics) , mechanics , voltage , materials science , amplitude , vortex , flow (mathematics) , electrode , residence time (fluid dynamics) , control theory (sociology) , chemistry , physics , optics , electrical engineering , computer science , engineering , control (management) , quantum mechanics , artificial intelligence , geotechnical engineering
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.