抄録
We have been developing the liquid mercury target system for a megawatt-class spallation neutron source. In the system, cavitation induced damage at the beam window of the mercury target vessel is a critical issue to decide lifetime of target. In this study, the cavitation bubble behaviors of the growth and collapse under water flow field were investigated by using the combination of a spark discharge for bubble formation and a high-speed photography in order to be clarified the mechanism of mitigating cavitation damage in narrow channel. Relationships between the shock waves due to the cavitation bubble collapsing and the flow velocity was examined. The bubble shape just before collapsing in the flow was also compared with that without flow through the image analysis. The results showed that the shock waves that correlated with the cavitation intensity is mitigated by flowing.
