Observations of the dynamics and acoustics of travelling bubble cavitation

Ceccio, Steven L.; Brennen, Christopher E.

doi:10.1017/s0022112091000630

Cited by 135 publications

(110 citation statements)

References 29 publications

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“…Blake et al (1977) photographed the collapse of cavitation bubbles over a tripped hydrofoil and observed that the bubble deforms into a hemispherical shape before collapsing and that it breaks up into pieces during the collapse process. A similar pattern of bubble breakup has been observed photographically in travelling bubble cavitation around axisymmetric headforms by Ceccio & Brennen (1991). Van der Meulen & van Renesse (1989) have acoustically and photographically studied the collapse of laser-produced cavities in flows around hemispherical headforms.…”

Section: Usasupporting

confidence: 56%

“…The bubble may break up during the collapse due to shear in the flow or as a result of the onset of large bubble oscillations. From the photographs of Ceccio (1990) one can estimate the two pieces to be 1 mm apart which, at a flow velocity of about 10 ms, would lead to peaks roughly 0.1 ms apart. This is substantially larger than the observed peak separation of about 0.015 ms.…”

Section: Resultsmentioning

confidence: 99%

“…The experiments were conducted in the low turbulence water tunnel (LTWT) at the California Institute of Technology with experimental equipment similar to that used by Ceccio & Brennen (1991). The test section of the LTWT is 30.5 cm x 30.5 cm and 2.5 m long.…”

Section: Methodsmentioning

confidence: 99%

“…Travelling bubble cavitation was produced on the two axisymmetric headforms used by Ceccio & Brennen (1991), namely a Schiebe headform of diameter 5.08 cm (Gates et al 1979) and an ITTC headform of 5.59 cm diameter (Lindgren & Johnsson 1966). The Schiebe headform was designed to suppress laminar separation in cavitating conditions (Schiebe 1972).…”

Section: Methodsmentioning

confidence: 99%

“…This means that since the cavitation site is much closer to the hydrophone than it would be if the hydrophone were placed near tunnel walls, the distortion of the signal due to the natural acoustic modes of water tunnel and the acoustic reflections from the water tunnel walls are minimized. While the acoustic path between the bubble and the hydrophone is not perfectly transparent, Ceccio & Brennen (1991) found this distortion to be insignificant by comparing the signal with that of a far-field hydrophone. Kuhn de Chizelle (1993) and Kuhn de Chizelle et al (1992) carried out reciprocity measurements over the range 1 to 100 kHz using a similar internal hydrophone and a wall-mounted external hydrophone, and encountered a maximum discrepancy of less than 3 dB.…”

Section: Methodsmentioning

confidence: 99%

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A study of pressure pulses generated by travelling bubble cavitation

Kumar

Brennen²

1993

J. Fluid Mech.

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The collapse process of single bubbles in travelling bubble cavitation around two axisymmetric headforms have been studied acoustically to understand the collapse process of a cavitation bubble and characterize the sound emission in travelling bubble cavitation. The bubbles were observed to collapse and then sometimes to rebound and collapse again, resulting in one or two pulses in the acoustic signal from a cavitation event. It was observed that each of the pulses could contain more than one peak. This phenomenon is called multipeaking and is clearly distinct from rebounding. The occurrence of rebounding and multipeaking and their effects on some characteristic measures of the acoustic signal such as power spectra are examined in this paper. Two particular headforms (ITTC and Schiebe) with distinct flow characteristics were investigated.Both rebounding and multipeaking increased with reduction in the cavitation number for the ITTC headform. Smaller flow velocity, smaller cavitation number and multipeaking delay the rebound. The peak amplitude of the sound emitted from the first collapse was seen to be twice as large as the peak amplitude of sound from the second collapse, suggesting a repeatable process of bubble fission during the collapse process. Multipeaking and rebounding increased the characteristic measures of the acoustic signal such as the acoustic impulse. These characteristic measures have larger magnitudes for smaller flow velocity. Also, the values of these characteristics are larger for the ITTC headform than for Schiebe headform.Theoretical calculations based on the Rayleigh-Plesset equation were seen to correctly predict the order of magnitude of most of these characteristic measures. However, the distribution of spectral energy is not properly predicted; bubble fission during the collapse is thought to account for this discrepancy. Reduction in the cavitation number and multipeaking are observed to decrease the fraction of spectral energy contained in the high-frequency range (30-80 kHz).

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Section: Usasupporting

confidence: 56%

Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

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