It has been shown in previous papers that the action of a low-frequency acoustic field on the cavitation zone generated by a high-frequency one is an efficient method for increasing the activity of cavitation. In the interacting fields a non-additive enhancement of sonoluminescence was observed, sometimes exceeding many times the individual ones. The possible mechanism responsible of this phenomenon are discussed in the paper: – broadening of the spectral composition of the resultant field; – periodic decrease in the total quasi-static pressure in the low frequency field; – suppression of clusterization of cavitation bubbles; - generation of new nuclei by the fragmentation following low frequency bubbles collapse.
Study of the Enhancement of Sonoluminescence Emission in Interacting Fields of Highly Different Frequencies
FRANCESCUTTO, ALBERTO;
2002-01-01
Abstract
It has been shown in previous papers that the action of a low-frequency acoustic field on the cavitation zone generated by a high-frequency one is an efficient method for increasing the activity of cavitation. In the interacting fields a non-additive enhancement of sonoluminescence was observed, sometimes exceeding many times the individual ones. The possible mechanism responsible of this phenomenon are discussed in the paper: – broadening of the spectral composition of the resultant field; – periodic decrease in the total quasi-static pressure in the low frequency field; – suppression of clusterization of cavitation bubbles; - generation of new nuclei by the fragmentation following low frequency bubbles collapse.Pubblicazioni consigliate
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