Effects of a water hammer and cavitation on the motion of a gas-liquid interface

Abstract eng:
The interaction among a water hammer and the motion of a gas-liquid interface is of great importance in various fluid systems. We recently reported a simplified model for clarifying the interaction. However, the most dominant event (i.e. the pressure wave propagation) of the model has not been experimentally verified. This study measures the pressure near the interface in order to experimentally reveal the mechanism of the interface motion. We impact a liquid-filled container and generate a pressure wave in a liquid. The pressure impulse in the early stage of the wave propagation event is compared with the maximum volume of cavitation bubbles. Remarkably, a linear relation between the pressure impulse and bubble volume is found. The trend is the same as the relation between the interface velocity and the bubble volume we beforehand reported. It indicates that the pressure impulse decides the motion of the interface.

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