The Study Of The Sound Field Of The Chemical Reactor

Since the1970’s, ultrasound as a new form of energy, are acted on the chemical reaction process, mutual penetration between ultrasonics and chemical, thus opening up a new chemical reaction pathways. Ultrasound can not only improve the condition of reaction, accelerate its speed and improve the rate, but also make many reactions, which could not or were diffificult to carry out in the past, smoothly go on. Based on this, produced a new cross-disciplinary-sonochemistry. Since the sonochemistry which is a new interdiscipline birthed, and it has developed by leaps in the twenty years time.The sonochemical reactor is an important place for the sonochemical reaction to achieve as well as researchof sonochemisty, it is a vessel or a system, in which the chemical reaction goes on with the introduction and the action of ultrasound. Its structure main includes two parts which are the space for reaction solution and the transducer, according to the different requirements of thereaction liquid system and the basic structure principle, the sonochmical reactors can be divided into:cleaning trough, cup, jet generator, transformer immerged and so on. Because sonochemistry is a unique interaction between sound energy and substances, at present, the more unified view formed by scientific research is that the driving force and the main mechanism of the sonochemistry reaction is ultrasonic cavitation. The research on the distribution of the sound field in the sonochemical reactor is a significant impact for the determination of the optimum condition of reaction and increasing sonochemical rate, and is also very important for the promoting the sonochemistry transitted from laboratory scale to industry transition.Based on the above analysis, these’s foucuses on the sound field distribution of the sound pressure in the rectangular sonochemical reactor. First of all, starting from the basic acoustic wave eqution, made a theoretical calculation of the sound field in the rectangular sonochemical reactor. Then analyzed the influence of the reactor size and the liquid depth on the cavitation field distribution in the rectangular sonochemical reactor, and studied the distribution of the sound field in the sonochemical reactors with the experiment at last.The main content of the research is follows: 1. Starting from the basic three-dimensional wave equation, made a theoretical calculation of the sound field in the rectangular sonochemical reactor. On the basis above, its obtained the distribution of the longitudinal sound pressure when the reactor size and the liquid depth changes with the wavelength of the sound source.2. Using of Matlab software simulation and analysis of the distribution of the longitudinal sound pressure. The results show that the total sound pressure amplitude distribution is superposed by the normal sound wave and the higher vibration in-phase; the main of effect of the total sound pressure amplitude is the higher vibtatinal in-phase in the near-field region, sound pressure amplitude attenuation very fast along with the liquid depth increase; and in the far-field region, the normal sound wave is the main of effect of the total sound pressure amplitude, sound pressure amplitude fluctuation change along with the liquid depth increase. When the liquid depth take an odd multiple of quarter wavelength, the effects of the higher vibration in-phase on the total sound pressure amplitude can be ignored, besides the total sound pressure amplitude is superposed by all kinds of normal sound wave; and when meet certain conditions, it can occurred to longitudinal resonance, which is similar to the standing wave that formed by the single plane wave.3. The distribution of the sound field in the two frequency, which are27.8kHz and33.3kHz, sonochemical reactor is measured by the hydrophone and dyeing methods, and has carried on the discussion and the analysis. The experimental results and the theoretical analysis results are consistent.