Study of interaction of cavitation zone with interphase boundary for the determination of efficient modes of ultrasonic intensification of physical-chemical processes

摘要

The article describes the model of the interaction of cavitation zone formed under the action of ultrasonic vibrations and interphase boundary of gas and liquid media, which spreads on solid surface in the form of liquid layer. It is shown that this interaction leads to the generation of capillary waves and consequently to the increase of efficiency of physical-chemical processes due to enlarged “liquid-gas” boundary. The analysis of the model allows determining square of interphase surface in dependence on amplitude, frequency of ultrasonic oscillations and liquid properties. It allows to determine the modes of ultrasonic action, which is necessary for maximum increase of contact surface area, in turn it leads to the growth of speed of the realization of physical-chemical processes based on surface interaction of dissimilar substances. As a result of the analysis it was determined that the most appropriate frequency of ultrasonic action is 60 kHz, at which increase of contact surface from 200 to 780 m/m (at 5 mm thickness of liquid flm) can be achieved.