Electronic Journal Technical Acoustics ISSN 1819-2408

N. V. Dezhkunov, P. V. Ignatenko, A. V. Kotukhov

Optimization of the activity of cavitation generated by pulsed ultrasound

language: Russian

received 09.08.2007, published 28.08.2007

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ABSTRACT

The influence of duration and period of ultrasound pulses on sonoluminescence intensity is studied. Simultaneously with the photomultiplier output the hydrodphone output placed behind the focal spot of a radiator is registered in experiments. It is shown, that the dependencies of cavitation activity on pulse duration and pulse period are of extreme character. With increase of ultrasound intensity the maximum of the sonoluminescence intensity is shifted aside greater pulse periods and smaller pulse durations. The maximal cavitation activity achieved by the variation of the intensity of ultrasound is higher for lower durations and for greater periods of ultrasound pulses. From the results received it is possible to allocate two thresholds of cavitation: the first one corresponds to occurrence of light pulses, and the second one - to step-like increase of the sonoluminescence intensity. The second threshold of cavitation is characterized by the sharp increase of the absorption of ultrasound in a cavitation zone. The reason of this increase is evidently caused by the increase in volumetric bubbles concentration in a cavitation zone.

Keywords: ultrasound, ultrasound pulses, intensity, sonoluminescence, acoustical cavitation

11 pages, 7 figures

Сitation: N. V. Dezhkunov, P. V. Ignatenko, A. V. Kotukhov. Optimization of the activity of cavitation generated by pulsed ultrasound. Electronic Journal “Technical Acoustics”, http://www.ejta.org, 2007, 16.

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		Nikolay Dezhkunov, Ph. D., was born in 1952. Presently he is a head of the Laboratory for ultrasonic technologies and equipment. Research interests of N. Dezhkunov are related mainly to high-power ultrasonics including sonoluminescence, ultrasonic capillary effect and other cavitational effects. N. Dezhkunov is an author of 115 scientific publications, including two books, 57 papers in peer-reviewed journals, 41 patents. He has been granted by Belarusian Foundation for Fundamental Investigations, Belarusian National Academy of Sciences, Ministry of High Education of Belarus, International Science Foundation, INTAS and INCO-COPERNICUS European programs. On the basis of the results achieved new methods of non-destructive testing and apparatuses for high power ultrasound dosimetry - cavitometers were developed.
		Pavel Ignatenko graduated from the Belarusian State University of Informatics and Radioelectronics (BSUIR) on the design and manufacture of electronics in 2005, is the author of two published works. Research interests: secondary cavitation effects (bubbles noise and sonoluminescence)
		Alexei Kotukhov graduated from the Belarusian State University of Informatics and Radioelectronics (BSUIR), Department of Radioelectronics (2003). Presently he is a head of the Chemistry Department laboratory at BSUIR, participates in research projects financed by Belarusian Foundation for Fundamental Investigations, Belarusian National Academy of Sciences; INTAS European program. Scientific field: sonoluminescence, ultrasonic capillary effect and other cavitational effects, semiconductor compounds. e-mail: kavax(at)bsuir.unibel.by