FORMATION OF ZONES WITH MAXIMUM SUPERSONIC CAVITATION INTENSITY IN SINGLE-COMPONENT AND MULTICOMPONENT MEDIA

Experimental studies have been made on the formation of highly active cavitation zones in fl uid media at high pressures (up to 6.5 MPa) and temperatures (up to 150^o C) with the use of a high-power ultrasonic installation. It has been shown that attempts to increase the cavitation intensity in single-component and multicomponent media by increasing the power of the ultrasonic installation to above a certain limit lead to a strong degradation of the cavitation processes. This is due to the appearance of hydrodynamical fl ows generated by longitudinal vibrations of the installation radiator waveguide. Eliminating or weakening such fl ows makes it possible to increase markedly the effi ciency of cavitation treatment by increasing the medium pressure (in the range of 0.5–1.5 MPa) and choosing the optimum ratio between the temperature of the medium and the power of the ultrasonic installation (specifi c acoustic power of the radiator). We recommend to use for the cavitation intensity index the acoustic activity of the cavitation zone (acoustic noise amplitude in the frequency range of 200 kHz–10 MHz), as well as its physical activity determined by the destruction rate of thin-layer indicators.
   
Author:  B. I. Bakhtin, A. I. Ivashov, A. V. Kuznetsov, and A. S. Skorokhodov
Keywords:  cavitation, cavitation intensity (activity), ultrasonic action, ultrasonic radiator (reactors, apparatuses), acoustic radiation, acoustic radiation intensity (power)
Page:  671