Abstract
We experimentally and numerically study a shock-bubble interaction problem in gelatin gels. The nucleation of spherical gas bubbles is triggered by focusing an infrared laser pulse into gassupersaturated gels and the radius of the nucleated bubble is controlled by mass transfer of the dissolved gases. A spherical shock is then generated, through rapid expansion of plasma induced by the laser focusing, in the vicinity of the gas bubble. The shock-bubble interaction is recorded by a CCD camera with flash illumination of a nanosecond green laser pulse. The observation captures cavitation inception in the gelatin under tension that results from acoustic impedance mismatching at the bubble wall. We measure the probability of cavitation with varying the bubble radius and the standoff distance. The threshold pressure for the cavitation inception is defined by the probability equal to one half and is predicted, through comparisons to Euler flow simulations, at −25 MPa.
Published Version
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