Efficient ultrasonic atomization using a vibrating small gap

This report describes ultrasonic atomization using a small gap between a vibrating ring and a wall. A large volume of small particles of around 10 ¿m in diameter can be produced by the vibrating gap even at lower frequencies of several 10 kHz. In prototyping, a aluminum ring of around 70 ¿m in diameter is driven in its seventh expansion mode, and the atomization takes place along the circumference of the ring. The experiments at 26 kHz and 40 kHz show that the particle size depends on the gap width and the frequency.