In recent years, cavitating jet has attracted attention as an application of water jet technology. In its application, it is important to clarify the jet flow structure and the behavior of bubble cloud collapse. Therefore, in order to visualize the cavitating jet flow structure and elucidate the behavior of collapsing of cavitation bubble clouds, we conducted numerical simulations with gas-liquid two-phase media model. We validated the numerical model by comparing the numerical results with the theoretical and experimental results and had a good agreement. In the case of gas-liquid two-phase free jet, cavitation bubble clouds emit periodically and transfer at a regular speed. And some bubble clouds merge with a preceding bubble clouds. Comparing with liquid single-phase jet, the core region is maintained to the further downstream and we show the usefulness of the cavitating jet. In the case of gas-liquid two-phase impinging jet, after a cavitation bubble cloud collides with wall, it is broken by applying pressure and generates a shock wave. At this time, the impact pressure becomes maximum. Thereafter, the shock wave affects other cavitation bubble clouds and break these. The collapsed cavitation bubble cloud rebounds and collapses again near the collision wall surface.
|ジャーナル||IOP Conference Series: Materials Science and Engineering|
|出版ステータス||Published - 2017 10月 16|
|イベント||14th International Conference on Fluid Control, Measurements and Visualization, FLUCOME 2017 - Notre Dame, United States|
継続期間: 2017 10月 8 → 2017 10月 12
ASJC Scopus subject areas