Optically observation of mercury cavitation bubble collapsing

The visualization of growth and collapse behavior for mercury cavitation bubble in contact with the solid wall was systematically carried out using precisely controlled pressure pulse and high-speed video cameras in order to understand the cavitation bubble behavior in mercury. It was confirmed through the measured time histories of pressure, vibrational acceleration, visualized images of bubble growth and collapse behavior that the acoustic emission was induced by the bubble collapsing which brings about the microjets and the shock waves. The annulate mist band expanding phenomenon caused by the shock wave propagation was visually recognized.

► Mercury cavitation bubbles in contact with the solid wall were visualized.
► The time history of pressure and acoustic emission was measured.
► The mist band expanding phenomenon caused by the shock wave propagation was visually recognized.