Abstract
A contracting motion on the cavitation causes the damage to the fluid machineries. It is important to analyze the radial motion of an expansion and a collapse of a bubble. A minute refrigerant droplet is paid attention to the decrease in the collapse pressure in cavitaion. The purpose of this study is to clarify the mechanism of the suppression of the cavitation with refrigerant droplet injection. The present study is performed in decompression experiment to observe a bubble radial motion in varying pressure fields by using a shock tube. As a result, the collapse radius velocity of the refrigerant vapor bubble is slower than that of the vapor/gas bubble in water. Therefore, the collapse pressure on the cavitation with a refrigerant droplet including a small air bubble becomes smaller than that of the case with air bubble motion in water.
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