Abstract
The nonlinear phenomena in the vicinity of free surface of water, induced by the incidence of high intensity underwater compressional pulse, are experimentally investigated. The behaviors of cavitation bubbles and water surface are observed by photographical visualization. It is concluded that the transmission and the reflection at the free surface are linear, and the limitation of negative pressure observed in the reflected pulse must be due to the onset of cavitation. Utilizing the phenomena, the cavitation threshold of water for negative pressure pulse of about 10 µs duration is measured. Obtained threshold value of air-saturated tap water is about 10 atm., and after water is degassified to 20% of saturation it becomes about 20atm., at 20°C. The dependence of the threshold on temperature is also investigated.
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