Труды Института механики им. Р.Р. Мавлютова
Электронный научный журнал | Electronic Scientific Journal
Proceedings of the Mavlyutov Institute of Mechanics
In the paper, the procedure for performing experimental measurements and the results of studies on the dynamics of interaction of ultrasonic fields with a bubble liquid in a closed volume with reflecting walls and a free surface were detailed description. The influence of different concentrations of bubbles in the liquid on the nature of the purification of the medium from them is considered. In a bubble liquid, the velocity of acoustic waves decreases substantially, which leads to a redistribution of the conditions for the formation of standing waves. It was found that an increase in concentration leads to a more intensive displacement of air bubbles by an ultrasonic field with forming of a displacement front.
The aim of the article is to find methods for controlling a number of bubbles by means of an ultrasonic field.
The experimental procedure is traditionally used piezoelectric sources and receivers with appropriate electronic equipment for ultrasound generation and measurement. The experiment uses visualization methods and, accordingly, the processing of experimental results with ImageJ.
The results of measuring the intensity of an acoustic field in a test cell filled with water are presented. The disperse composition was determined, histograms were constructed in the region of volumetric gas concentration from 0.002 ÷ 0.12% with bubble sizes from 2 to 30 μm. The effect of the ultrasonic field at a given frequency of 150 Hz and a fixed radiation power on the behavior of liquid bubbles in water at five selected concentrations was studied
At small concentrations: 0.002-0.006 bubbles are grouped in antinodes of standing waves. An increase in the concentration of bubbles leads to a significant decrease in the length of the ultrasonic wave. At concentrations of 0.02 and higher, collective bubble displacement is detected together with the short-wave zone. The higher the concentration, the more efficient is the displacement with a clearly visible front of a rather complex shape.