The Propagation Of Sound In The Mixture Matter Of Bubbles And Liquids And Ultrasonic Cavitation

Compared with the propagation of sound wave in solid or gas, the propagation of sound wave in liquid has its characteristic, which is cavitation when the high-intensity ultrasonic wave propagates in it. Many applications of ultrasound are based on the cavitation in liquid. So the researches of theory and experiment of cavitation become focus. The cavitation correlates with many factors, and going with complicated nonlinearity, which makes many difficulties in the researches of the theory of cavitation, so the researches of cavitation are mostly experiment and applications. The applications of cavitation include ultrasonic cleaning ultrasonic disposal sonochemical reaction, environment protection, ultrasonic medicine and therapy , etc. Recently ultrasonic safe dose of ultrasonic therapy becomes the hotspot, which needs urgently many more researches of theory and experiment of cavitation. In future there will be a new revolution in nuclear reaction, for in 2002, Taleyarkhan and his colleagues of the state-run lab of America Oak Ridge alleged that they had found nuclear fusion reaction in ultrasonic cavitation field, which offers a new mode.In this paper following work has been done based on the theory and experiment researches of cavitation:(1) Based on the characteristic of the propagation of sound wave in liquid and considering the viscidity of liquid, the propagation of sound wave in liquid and bubble. In base of the three basal equations of the propagation of sound wave, the sound wave equation has gained, and the volume ratio becomes one of the deciding factors of the ultrasonic field. Further more, the sound velocity and sound attenuation have been gained in the circumstance of compressing and uncompressing, the changing trend of them has been get.(2) Ultrasonic cavitation affects the propagation characteristic of sound wave in liquid, which means that the load of ultrasonic transducer changes. Based on the equivalent circuit of ultrasonic transducer and the propagation law of sound wave, the impedance of transducer has been researched, and the effect of ultrasonic cavitation has...