Transient cavitation induced by periodic sequence of tone bursts

Development of cavitation in liquid under a periodical ultrasonic exposure was studied. The cavitation development in a regime of rarely repeating bursts was practically the same as in undisturbed liquid. The time of stable cavitation development was two times shorter when the series of ultrasonic bursts with small pause duration (1-3 sec) between bursts was applied compared to the case of undisturbed liquid. The results are explained by the finite time of bubble concentration evolution after the ultrasonic exposure.