Time Resolved Measurement of Dielectric Particles Velocity on Standing Wave Electric Conveyor using PTV Technique
Résumé
The interaction between micro-sized dielectric particles and standing wave electric field is investigated experimentally in this paper. The particles are deposited on a conveyor made of a series of copper electrodes on a dielectric surface and moved by an electric field. The standing wave electric field is generated by applying 2-phase voltage signals to the electrodes. Particles motion is recorded using high speed camera, and then a Particles Tracking Velocimetry (PTV) based post-processing is carried out in order to track each particle and evaluate its velocity. The main results indicate that the particles move toward both directions perpendicular to the electrodes close to the surface and their velocity increases. Some of them can reach the synchronism velocity equivalent to that of the electric wave. However, most of the particles cannot reach this velocity because of the contribution of adhesion and drag forces.