Details of the observed evolution of a high pressure transient cavitation event are described. The combination of photomultiplier tubes, hydrophones, fiber optic hydrophone, laser to photo diode light blocking methods are used to explore the evolution of a transient bubble cloud event from ns to ms time scales. [Work supported by SMDC Contract No. W9113M-07-C-0178.]
High amplitude shock waves due to collapse of a cavitation bubble were photographed using a high power pulsed laser diode driven with an avalanche transistor pulser. The strong implosions of high pressure bubble cavitation travel initially at several times the local speed of sound. This method was used to measure shock wave velocity in water at static pressures up to 300 bars. The photographs were taken between 30 and 60 ns of the bubble implosion. Schlieren and shadowgraphy techniques were used and compared. The purpose is to characterize the pressure conditions that exist shortly after the implosion of a high pressure sonoluminescence bubble. [Work supported by SMDC Contract No. W9113M-07-C-0178.]
The behavior of shocks emitted from transient cavitation in acoustic cavitation systems with static pressures up to 300 bar is explored using photomultiplier tubes, hydrophones, Schlieren, and Shadowgraphic methods. Shocks emitted from strong implosions travel initially at supersonic velocities, leading to a shortening of the time of flight (TOF) from implosion site to detector as compared to sound speed motions. A larger difference between expected sonic and actual supersonic translation times is indicative of higher stagnation pressures. Experimental results are indicative of possible stagnation pressures in the Mbar range and place constraints on computer models. [Work supported by SMDC Contract no. W9113M-07-C-0178.]
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