Influence of Ultrasonics on Settling Velocity of Particles in Water

Abstract

The effect of ultrasonics on settling velocity of suspended particles in water was studied. Pulse ultrasonic irradiation was much more effective than continuous irradiation. The settling velocity tends to decrease at an ultrasonic frequency of 200 kHz and increase at 1, 600 kHz. The measure of increase of settling velocity is expressed by UR, the ratio of velocity of particles under pulse irradiation to that without irradiation.
U_R=exp (αI+βT) : d_p>13, c0 = 0.19 2.2 wt%, I= (112) × 10⁶ erg/cm² · sec where I is ultrasonic intensity, d_p is diameter of particle, c0 is concentration of particles in water, T is number of pulse irradiation times and α, β are experimental constants.