抄録
In this study, we control the velocity of a narrow liquid jet and the condition of cavitation occurrence. A liquid filled test tube impacts a rigid floor and the jet is induced from curved meniscus. Its velocity is strongly related to the volume of bubbles if the cavitation is occurred by the water hammer. In order to control its velocity, we investigate the condition for cavitation occurrence. We change the material of the floor and hence the impact duration. As floor materials, a metal and a resin are used. We found that the jet velocity linearly increases with the impact velocity for both materials. On the other hand, the condition for cavitation occurrence depends on the oor material. These findings suggests that the cavitation occurrence can be suppressed and the jet velocity can be well controlled by changing the material of the floor.
