Abstract
The behavior of cavitation cloud shedding in submerged water jets issuing from a sheathed pipe nozzle is investigated experimentally by high-speed camera visualization observation. Experiments are carried out under different cavitation numbers decreased to 0.01 with increase of the injection pressure, and the frequency spectrum of cavitation cloud shedding is evaluated by statistical analysis of a sequence of high-speed camera images. Experiments demonstrate that cavitation clouds appear when the cavitation number σ decreases to the level of 0.5-0.7 and developed cavitation clouds shed downstream periodically at multiple frequencies. The low frequency components of cavitation cloud shedding is basically dependent upon the pressure pulsation of plunger pump, which is often employed in various industry application of water jets. However, the high frequency components are closely related to the shedding of vortexes and the collapsing of cavitation clouds, which are dependent on the flow structure of submerged jets and the property of cavitation clouds consisted of numerous bubbles.
Highlights
High-speed water jets, where pressurized water or fluid mixture issues from a small nozzle at high speed, have been developed and widely applied to many fields of industry for its peculiar processing property [1] [2] [3]
The high frequency components of cavitation cloud shedding are dependent on the bubble cloud distribution subjected to the flow structure and the property of bubble nuclei contained in working liquid
The behavior of cavitation cloud shedding in submerged water jet issuing from a sheathed pipe nozzle has been investigated by high-speed camera visualization observation
Summary
High-speed water jets, where pressurized water or fluid mixture issues from a small nozzle at high speed, have been developed and widely applied to many fields of industry for its peculiar processing property [1] [2] [3].
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