Abstract
By using an electro-rhydrodynamic (EHD) spraying technique, the droplets of micrometers size can be obtained through the disintegration of column of liquid subjected to the electric field between needle and plate. The EHD spraying exhibits various modes depending on electric field strength, mass flow rate and properties of liquid. In this work, the spray process in the tip of a needle was observed using high-speed video camera. In order to investigate the mechanism of spraying in the cone-jet mode, the volume and length of meniscus were measured from the pictures. As a result, it was found, that vibration and disintegration of meniscus took place depending on the change in the electric field strength and the mass flow rate.
