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Sheet Cavitation and Cloud Cavitation, Re-Entrant Jet and Three-Dimensionality
1998The unsteady behaviour of a sheet cavity on a hydrofoil under stationary conditions is important with respect to both noise generation and erosion. Observations of two-dimensional as well as three-dimensional cavities are performed. From the observation it is concluded that the formation of a re-entrant jet is of major importance to explain the ...
de Lange, D.F., de Bruin, G.J.
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Inception of cavitation clouds by scattered shockwaves
2010 IEEE International Ultrasonics Symposium, 2010Previous observations of cavitation clouds forming during a single, multi-cycle ( 80 um in diameter results in negative pressure above the 30 MPa threshold, while scattering from a spherical bubble 80%. 3) The region over which high negative pressure occurred in simulation coincided with the region cavitation is typically observed with high speed ...
Adam D. Maxwell +3 more
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An experimental study of sheet to cloud cavitation
Experimental Thermal and Fluid Science, 2017Abstract A 2D convergent-divergent test section was built to study experimentally sheet cavitation followed by bubble cloud formation. Flow visualizations and pressure measurements enabled correlating high speed photography observations with the pressures on the cavitating surface.
Xiongjun Wu +2 more
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Cloud cavitation effects in shockwave lithotripsy
The Journal of the Acoustical Society of America, 2003Cavitation has already been identified as an important damage mechanism in the comminution of kidney stones in shockwave lithotripsy (SWL). However, the precise conditions that maximize the damage caused by the collapsing bubbles are still unknown. Numerical simulations are used to investigate shock propagation and the consequent growth and collapse of
Tim Colonius, Michel Tanguay
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Nonlinear Phenomena of Acoustic Cloud Cavitation
AIP Conference Proceedings, 2008Acoustic cavitation, which is normally consisted of bubble cluster, has an important role in various fields such as medical, environmental, industrial applications. The strong pressure appears in the case of bubble cluster like a cloud cavitation. As the dynamics of bubbles are strongly influenced by the thermal phenomena inside the bubbles, these ...
Yoichiro Matsumoto +5 more
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Cavitation cloud translation in focused ultrasound
2014 IEEE International Ultrasonics Symposium, 2014Cavitation mediated effects in liquids exposed to ultrasound, play pivotal roles in a number of industrial arenas, including precision acoustic cleaning (megasonics) and sonochemistry. The spontaneous occurrence of cavitation, and the subsequent interaction with the liquid and the acoustic field, is however poorly understood, which prevents ...
Keith Johnston +2 more
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An Acoustic Detection Method of Cloud Cavitation
Journal of Fluids Engineering, 1984This paper deals with an investigation of a method which detects the generation of cloud cavitation by the measurement of cavitation noise. Cavitation noise consists of a pulse train with approximately 1 μs rise time and 10 μs duration and has almost ultrasonic characteristics.
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11 PFLOP/s simulations of cloud cavitation collapse
Proceedings of the International Conference on High Performance Computing, Networking, Storage and Analysis, 2013We present unprecedented, high throughput simulations of cloud cavitation collapse on 1.6 million cores of Sequoia reaching 55% of its nominal peak performance, corresponding to 11 PFLOP/s. The destructive power of cavitation reduces the lifetime of energy critical systems such as internal combustion engines and hydraulic turbines, yet it has been ...
Diego Rossinelli +9 more
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Behavior of unsteady cloud cavitation in a cavitating nozzle
The Proceedings of Conference of Hokuriku-Shinetsu Branch, 2018Naoya URA +2 more
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Investigation of Bubble Clouds in a Cavitating Jet
2016It is possible for cloud cavitation to severely damage a material’s surface. In this study, the unsteady behavior of cloud cavitation in a high-speed water jet is investigated by experimental observation and numerical simulations. Using a high-speed video camera with a frame rate of approximately \(5\times 10^5\) fps, it is found that high-pressure ...
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