Research on Droplet Directional Transport Based on Corona Discharge

In this paper, the effect of charge density gradient on droplet motion is studied, and the effect of the distance between droplet and needle, the distance between needle tip and ground and the length of needle on droplet motion is discussed by the control variable method. The experimental results show that the droplet moves in the order of flutter, movement and breakdown under the action of electric field. The closer the droplet is to the needle, the greater the charge density gradient, and the easier it is for the droplet to move. A moderate tip-to-ground distance and a longer needle facilitate efficient droplet movement. The increase of droplet volume reduces the breakdown voltage, and too small or too large volume limits the effective movement of droplet. The research provides a theoretical basis for the electric field control of droplet, and has guiding significance for the future experimental optimization and practical application.