Abstract
Ultrasonic atomization, Mist droplet, Ultrasonic frequency, Number concentration, Size distribution
Abstract: Ultrasonic atomization is used to produce fine liquid mists with diameter ranges below 100 nm. We
investigated the effect of the frequency on the size distribution of ultrasonic mist. A bimodal distribution was
obtained for the mist generated by ultrasonic atomization with a wide-range particle spectrometer. The peak
diameter decreased with increasing frequency, and the number concentration of the mist increased in the
smaller range. We determined the relation between the size distribution of the mist and the ultrasonic
frequency, and we proposed a generation mechanism for the ultrasonic nano-sized mist based on the amount of
water vapor around the liquid column. Increasing the power intensity and density by changing the surface
diameter of the ultrasonic oscillator affected the number concentration and size distribution of the nano-sized
mist. Using this technique, the diameter of the mist can be controlled by changing the frequency of the
ultrasonic transducer.
