Ultrasonic Levitation for Liquid Droplet

Abstract

Ultrasonic levitation in a gravity field was tested using a viscous liquid at a frequency range from 20 kHz to 28 kHz. Red ink and glycerin droplets havingdiameters in the range of 3 mm to 5 mm were placed at a node of a standing wave. As a result, the droplets were not only flattened like a disk, but also found to contain fine air bubbles. Additionally, the droplets continuously changed their location moving from node to node while maintaining a constant volume.