Abstract
It is known that ring-shape cavitation clouds are formed when a cavitating water jet impinges on solid wall. The ring-shape cavitation clouds cause ring-shape erosion distribution. In this study, we use a narrow channel in order to observe the sectional view of cavitating jet. We observe collapsing behaviors of cavitation clouds and formation process of cavitation clouds spreading on solid wall in order to connect directly collapsing behavior of cavitation clouds with erosion distribution. As a result, two types of bubble collapse behavior can be observed at least. The one is a collapse of cavitation clouds around jet center and the other is a collapse of cavitation clouds spreading on the impinging wall.
