High power ultrasonic waves in water
Hall, Eldon Conrad
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The phenomena of cavitation limits the power transmitted in water, but it is known that if the sound is transmitted in pulses, the power required to produce cavitation increases with decreasing pulse length. In many liquids including water, the increase in power to produce cavitation has been investigated for pulse lengths of 10 milliseconds and longer. In this report an attempted investigation of the cavitation point for pulse lengths near one microsecond was made. Some nonlinear characteristics that were previously reported as cavitation were found. These characteristics are not in complete agreement with those accompanying cavitation as reported in other sources, but they seem to arise from increased absorption caused by the dissassociation of the complex molecules of water by the sound waves. Most of the equipment used was designed by the Radiation Laboratory at M.I.T. and was modified for this experiment. Point to point measurements were made in preference to the reflection method as usually used with pulse measurements.
Thesis (M.A.)--Boston University This item was digitized by the Internet Archive.