Abstract
Recently, underwater shock wave focusing has been applied to the non-invasive disintegration of kidny stones. However, due to the highly non-linearity, the shock wave focusing phenomenon is stil unresolved. Therefore, it is crucial to clarify this complicated phenomenon. In this paper, the experimental and computational study of the underwater shock wave focusing is presented. The underwater shock wave was generated by using a 5mg lead azide (Pb(N3)2) pellet and a 10mg silver azide (AgN3) pellet, and reflected by an ellipsoidal cavity, and focuses at 2nd focal point. The focusing process was visualized by using holographic interferometry. The peak pressure along the axis of the reflector were also measured by Kstler 601H pressure transducer. The interferometric results were compared with the numerical simulation conducted by using a Total Variation Diminishing (TVD) finite difference scheme. A good agreement was obtained between the computation and experiment.
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