Abstract |
A Device for Cavitation Activity
Measuremnts and Investigation
N.Dezhkunov (Belarusian State
University of Informatics and Radioelrctronics, Minsk, Belarus)
e-mail:
dnv@bsuir.edu.by
A
device for cavitation activity investigation and measurements, Cavitometer
IC-3, is described in the presentation.
The Cavitometer consists of an electronic block and a wide-band
hydrophone protected against cavitation erosion. An operation principle is based on analysis
and elaboration of cavitation noise spectra. This principle was backgrounded by
investigation of cavitation noise spectra generated at different sonification
conditions. Sonoluminescence intensity was measured simultaneously with noise spectra
registration. It has been shown that at ultrasound intensities lower than the
sonoluminescence (SL) threshold noise spectra contain a fundamental line,
subharmonic and higher harmonics. The threshold of broadband component, so
called .white noise., appearance coincides with the threshold of
sonoluminescence. It has been shown that
if cavitation conditions change in such a way that bubbles collapse rate is
increased, both intensity of high frequency components (registered up to 10
MHz) and intensity of white noise are increased. The Cavitometer developed on the basis of the
above results has following functions: measurement of transient bubbles
activity, measurement of total bubbles activity, measurement of subharmonic
intensity and measurement of fundamental frequency of the driving field. Also
total calibrated hydrophone output may be registered with the help of the
device.
Section
: 11