Visualization Observation of Cavitation Cloud Shedding in a Submerged Water Jet
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An experiment investigation on the behaviour of cavitation cloud caused in submerged water jets issuing from a sheathed sharp edge orifice nozzle was carried out by high-speed camera visualizing observation. It is demonstrated that cavitation bubble cloud appears when the cavitation number σ decreases to the level of 0.6–0.7. The dominant frequencies of bubble cloud expanding and contracting in the axial direction is closely related to the pressure pulsation of plunger pump, which is often employed in industry application of water jets. However, the dominant frequencies of jet width oscillation in the radial direction mainly depend on the shedding of shear vortexes as well as the collapsing of cavitation bubble clouds.
KeywordsWater jet Cavitation Bubble cloud Visualization
This work was partly supported by JSPS, Grant-in-Aid for Scientific Research (C) (N0. 26420124). The authors would like also to thank Mr. K. Masuda, K. Ishizaki et al. for their assistance in experiments.
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