FINITE ELEMENT MODELING AND EXPERIMENTS REGARDING ULTRASONIC TRANSDUCERS USED IN AIR FILTERS

Abstract

The paper presents the studies, research and results obtained using ultrasounds in the field of industrial air filtration. In this regard, there are two types of air filter that have been designed for use in the air filtration system in the paint booths. The first type of filter uses vibrations from a classic system consisting of transducer, amplifier, and activated element. The second filter is based on the ultrasonic cavitation phenomenon. For both types of filtering systems, finite element analysis is useful, and it is very useful in selecting vibration modes and vibration frequencies to be used. Besides these are presented elements of the practical realization of the filters as well as some of the experimental results obtained. The main phenomena that occur in the propagation of ultrasounds through a gaseous medium: propagation velocity; compressing and scaling the environment according to the nature of ultrasonic waves; reflection and refraction of ultrasonic waves at the solid-gas interface; the creation of stationary waves and the emergence of pressure knots and antinodes; diffraction and diffusion of ultrasonic waves; attenuation of ultra-acoustic energy; ultra-acoustic absorption; ultrasonic cavitation, etc. it is proposed to use the effects of their propagation in the filtration and purification process and the construction of ultrasonic filters operating on the principle of "ultrasonic agglomeration" on the principle of "ultrasonic shaking" or combined.