Dynamics of Liquid Thread and Droplet of Magnetic Fluid under an AC Electric Field

This paper presents an investigation of liquid thread breakup from tip of a spike with applying high-voltage AC. Microscale interface behavior is visualized by using high-speed camera. An interface of a magnetic-fluid spike is oscillating with a twice frequency of the one of applying AC voltage. Applying more than a certain voltage makes an elongation of liquid thread from a tip of a spike. Then, micro droplets are generated by breaking up of liquid thread. Applying AC voltage allows continuous generation of droplets. It is found that the diameter of generated droplet is increase with applying voltage. The interface behavior becomes random above a certain voltage.