Abstract

Ultrasonic Cavitational Technologies

N.V.Malykh (Institute of Thermophysics SD RAS, Novosibirsk, Russia); A.O.Kuzmin (Institute of Catalysis SD RAS, Novosibirsk, Russia)

e-mail: Malykh@itp.nsc.ru

Experimentally investigated in this paper, is the process of an ultrasonic cavitation in various liquids, including loaded with solid particles. The effect of growth of particle subdivision degree and acceleration of chemical reaction is obtained. The optimal power and frequencies of ultrasonic field are determined. A frequency is chosen to be equal to a resonance frequency of bubbles commensurable with a current pore size on solid particle surface. The paper pioneers in synthesizing the expensive catalysts, such as molybdenicvanadicphosphoic heteropolyacids.The production time is reduced from some days to some hours. Investigations were performed too of phenol oxidation in aqueous solutions by cavitation and the way for the optimization was suggested with respect to decrease the energy consumption and the time of solution processing. The efficiency of cavitation is proved also for decomposition of the solutions of 1,1 dimethilhydrozine. Cleaning of aqueous solutions from organic contaminants, ecologically clean chemical technologies gain in importance all over the world. Besides the applied aspects, this problem is closely connected with the nonlinear wave dynamics of polyphase medium and supplements those part of investigation, where it is quite difficult to describe the processes mathematically.

Section : 11