High-Speed Observations of the Cavitation Cloud around a High-Speed Submerged Water Jet.

Soyama, Hitoshi; Yamauchi, Yoshiko; Adachi, Yasunori; Sato, Kazunori; Shindo, Takenori; Oba, Risaburo

doi:10.1299/jsmeb.38.245

Cited by 55 publications

(21 citation statements)

References 5 publications

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“…In particular, nozzle-type EEM utilizes a jet flow, which has been investigated in various fields such as water jet machining, water jet cleaning [9], and surface reforming with cavitation [10]. In these studies, the shape of the aperture and the structure of the channel in the nozzle are optimized to form a variable flow from the nozzle.…”

Section: Introductionmentioning

confidence: 99%

Effect of focusing flow on stationary spot machining properties in elastic emission machining

Takei

Mimura

2013

Nanoscale Res Lett

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Ultraprecise optical elements are applied in advanced optical apparatus. Elastic emission machining (EEM) is one of the ultraprecision machining methods used to fabricate shapes with 0.1-nm accuracy. In this study, we proposed and experimentally tested the control of the shape of a stationary spot profile by introducing a focusing-flow state between the nozzle outlet and the workpiece surface in EEM. The simulation results indicate that the focusing-flow nozzle sharpens the distribution of the velocity on the workpiece surface. The results of machining experiments verified those of the simulation. The obtained stationary spot conditions will be useful for surface processing with a high spatial resolution.

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Section: Introductionmentioning

confidence: 99%

Effect of focusing flow on stationary spot machining properties in elastic emission machining

Takei

Mimura

2013

Nanoscale Res Lett

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“…The rings are not the same in size, but this is normal because every picture represents a different instant of the jet's lifetime. As it may be seen in photos, the cavitating jet is changing with time in the order of seconds (this also concluded in [1,[5][6][7][8][9][10]). …”

Section: Synchronizationmentioning

confidence: 54%

“…In cavitating jets, a small vortex cavitation (initiated in the low-pressure region of the vortex core, which occurs in the shear layer around a high-speed water jet) and the vortex cavitation combine together to form a big cavitation cloud. Cloud shedding is a periodical phenomenon with a frequency of the order of several kHz [5,[8][9][10]. When the cloud impinges on a surface, a ring vortex cavitation appears.…”

Section: Introductionmentioning

confidence: 99%

Appearance of high submerged cavitating jet: The cavitation phenomenon and sono luminescence

et al. 2013

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In order to study jet structure and behaviour of cloud cavitation within time and space, visualization of highly submerged cavitating water jet has been done using Stanford Optics 4 Quick 05 equipment, through endoscopes and other lenses with Drello3244 and Strobex Flash Chadwick as flashlight stroboscope. This included obligatory synchronization with several types of techniques and lenses. Images of the flow regime have been taken, allowing calculation of the non-dimensional cavitation cloud length under working conditions. Consequently a certain correlation has been proposed. The influencing parameters, such as; injection pressure, downstream pressure and cavitation number were experimentally proved to be very significant. The recordings of sono-luminescence phenomenon proved the collapsing of bubbles everywhere along the jet trajectory. In addition, the effect of temperature on sono-luminescence recordings was also a point of investigation.

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“…Cavitation clouds shed periodically from the nozzle and spread out across the surface being treated, and when the bubbles collapse they produce impacts which can deform the material [10]. A cavitating jet can be used to treat surfaces set parallel to the jet axis [11] and also introduce compressive residual stress at depth beneath the surface [12].…”

Section: Introductionmentioning

confidence: 99%

The Use of Cavitation Peening to Increase the Fatigue Strength of Duralumin Plates Containing Fastener Holes

Soyama

2014

MSA

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An effective method for improving the fatigue life of Duralumin plates with fastener holes, such as those used in the construction of aircraft, is to introduce a compressive residual stress around the fastener holes. Cavitation peening is a novel peening method that uses the cavitation impact produced when a high-speed water jet is injected into a water-filled chamber. In this paper, Duralumin plate specimens with holes were treated by cavitation peening under various conditions, and the fatigue strength of the specimens was determined using a plate bending fatigue test. It was revealed that a compressive residual stress was introduced not only on surfaces perpendicular to the axis of the cavitating jet but also on the walls of holes which were parallel to this. It was found that a 51% improvement in fatigue strength could be achieved by cavitation peening. Note that this is first report demonstrating an improvement in the fatigue life of Duralumin plates with fastener holes by cavitation peening.

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High-Speed Observations of the Cavitation Cloud around a High-Speed Submerged Water Jet.

Cited by 55 publications

References 5 publications

Effect of focusing flow on stationary spot machining properties in elastic emission machining

Effect of focusing flow on stationary spot machining properties in elastic emission machining

Appearance of high submerged cavitating jet: The cavitation phenomenon and sono luminescence

The Use of Cavitation Peening to Increase the Fatigue Strength of Duralumin Plates Containing Fastener Holes

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