A method for controlling and maintaining the thickness of a liquid layer during ultrasonic spraying

Abstract

This work is described a method for indirectly controlling the height of the film of sprayed material on the oscillating surface of ultrasonic atomizer by changing the resonant frequency of the ultrasonic oscillator. The relevance of the development of this method is due to the need for the development and widespread use of the ultrasonic spraying method to solve the most pressing problems of modern industry. In this regard, there is a need to establish the dependences of the spraying performance on the height of the film of sprayed fluid on the oscillating plane of the atomizer and to create, based on the identified dependencies, a method for controlling and maintaining the necessary and sufficient height of the fluid film, the spraying of which will provide the best dispersion characteristics of the generated aerosol at a given spraying performance. As a result of the research, it was shown that in the operating range of film height of the sprayed fluid, the change in the resonant frequency can reach 100 Hz, which is sufficient to control the film height. This made it possible for the first time to develop a method for automatically controlling the ultrasonic spraying process, ensuring the maintenance of optimal modes of ultrasonic exposure (amplitude of vibrations of the spray surface) and the thickness of the sprayed fluid height.