Enhancement of ultrasonic cavitation yield
by multi-frequency sonication

The paper reports the enhanced effect of multi-frequency ultrasonic irradiation on cavitation yield.The cavitation yield is
characterized by electrical conductivity determination, fluorescence intensity determination and iodine release method.Two-frequency
(28 kHz/0.87 MHz) orthogonal continuous ultrasound, two-frequency (28 kHz/0.87 MHz) orthogonal pulse ultrasound and
three-frequency (28 kHz/1.0 MHz/1.87 MHz) orthogonal continuous ultrasound have been used. It has been found that the
combined irradiation of two or more frequencies of ultrasound can produce a significant increase in cavitation yield compared with
single frequency irradiation.The possible mechanisms of the enhanced effect are briefly discussed.
 2002 Elsevier Science B.V. All rights reserved.
Keywords: Multi-frequency; Sonication; Cavitation yield

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