Study On The Distribution Of Sound Field In The Sonochemical Reactor

With the appearance of efficient and powerful transducer in 1970's, ultrasound plays a role in chemical reaction as a kind of new energy. The permeation of chemistry and it opens up a new channel for chemical reaction. Ultrasound can not only perfect the condition of reaction, quicken its speed and raise its rate, but make many reactions, which could not or were different to conduct in the past, successfully go on. Furthermore, it has become an important research field as a convenient, efficient and safe technology. On this basis, a new frontier subject—-sonochemistry, which takes advantage of ultrasound energy to speed up and control the chemical reaction, increase reaction rate and initiate a new chemical reation, appears.The important place to carry out the sonochemical research and then to achieve its reaction is a sonochemical reactor—a container or a system, in which the chemical reaction goes on with the introduction and the action of ultrasound. Different from a common chemical reactor, a sonochemical reactor includes 2 parts: the space for reaction solution and a transducer. They belong to a coupling system of electricity and sound. The sonochemical reaction is triggered off by the cavitational effect of ultrasound, and cavitation is the driving force of sonochemical reaction. Its formation, state and intensity are related with many acoustic parameters. As the physical and chemical property of the reaction solution is certain, the intensity and the distribution of the sound field take a remarkable effect on the chemical reaction rate and the chemical selection in the reactor. The more uniformly the sound field is distributed in the reactor, the more favorably the sonochemical rate is increased. Therefore, the research on the distribution of the sound field and the cavitation field in the sonochemical reactor is vital for increasing sonochemical rate and promoting the sonochemistry transitted from lab scale to industry.The paper's aim is: in order to improve the distribution of sound field, design a longitudinal-flexural composite mode ultrasonic transducer composed of a sandwich longitudinal mode ultrasonic transducer and a flexural regular hexagon plates, and then stick it on the side of the trough-like sonochemical reactor, that is, to add a flexural vibration regular hexagon plate between the sandwich longitudinal mode ultrasonic...