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Articles
The Temperature of Cavitation
1 School of Chemical Sciences, University of Illinois at Urbana-Champaign, Urbana, IL 61801
Ultrasonic irradiation of liquids causes acoustic cavitation: the formation, growth, and implosive collapse of bubbles. Bubble collapse during cavitation generates transient hot spots responsible for high-energy chemistry and emission of light. Determination of the temperatures reached in a cavitating bubble has remained a difficult experimental problem. As a spectroscopic probe of the cavitation event, sonoluminescence provides a solution. Sonoluminescence spectra from silicone oil were reported and analyzed. The observed emission came from excited state C2 (Swan band transitions, d3IIg—a3IIµ), which has been modeled with synthetic spectra as a function of rotational and vibrational temperatures. From comparison of synthetic to observed spectra, the effective cavitation temperature was found to be 5075 ± 156 K. Submitted on April 29, 1991Accepted on July 29, 1991
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Science. ISSN 0036-8075 (print), 1095-9203 (online)
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