Abstract
Friction reduction effect by acoustic pressure and surface vibration of ultrasonic was investigated. As a result, small particles are hardly affected by acoustic pressure. However, in case of large-sized particles, friction is decreased greatly by acoustic pressure. Moreover, the effect by surface vibration has relation to particle density. In short, this effect is enlarged with increasing of particle density. Finally, separation for particle size and material was tried by making use of difference in friction reduction. Results showed silica was divided according to each size, and iron could be picked up from particles which include titanium.
