We have developed the rice powder production device using the underwater shock wave. The spark by a high-voltage power supply was used for generating of a shock wave. We developed two types of the high voltage power supplies, the CR circuit using transformer, Cockcroft-Walton circuit (CW circuit). We developed the vessel having the window for observation of shock wave. Generated pressure and velocity of the shock wave are evaluated using shadowgraph method used two power supplies (CR circuit and CW circuit).

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