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Collapse and pinch-off of a non-axisymmetric impact-created air cavity in water

Published online by Cambridge University Press:  24 April 2012

Oscar R. Enriquez*
Affiliation:
University of Twente, Enschede, 7500 AE, The Netherlands
Ivo R. Peters
Affiliation:
University of Twente, Enschede, 7500 AE, The Netherlands
Stephan Gekle
Affiliation:
University of Twente, Enschede, 7500 AE, The Netherlands
Laura E. Schmidt
Affiliation:
University of Twente, Enschede, 7500 AE, The Netherlands
Detlef Lohse
Affiliation:
University of Twente, Enschede, 7500 AE, The Netherlands
Devaraj van der Meer
Affiliation:
University of Twente, Enschede, 7500 AE, The Netherlands
*
Email address for correspondence: oscarenriquez@gmail.com

Abstract

The axisymmetric collapse of a cylindrical air cavity in water follows a universal power law with logarithmic corrections. Nonetheless, it has been suggested that the introduction of a small azimuthal disturbance induces a long-term memory effect, reflecting in oscillations which are no longer universal but remember the initial condition. In this work, we create non-axisymmetric air cavities by driving a metal disc through an initially quiescent water surface and observe their subsequent gravity-induced collapse. The cavities are characterized by azimuthal harmonic disturbances with a single mode number and amplitude . For small initial distortion amplitude (1 or 2 % of the mean disc radius), the cavity walls oscillate linearly during collapse, with nearly constant amplitude and increasing frequency. As the amplitude is increased, higher harmonics are triggered in the oscillations and we observe more complex pinch-off modes. For small-amplitude disturbances we compare our experimental results with the model for the amplitude of the oscillations by Schmidt et al. (Nature Phys., vol. 5, 2009, pp. 343–346) and the model for the collapse of an axisymmetric impact-created cavity previously proposed by Bergmann et al. (J. Fluid Mech., vol. 633, 2009b, pp. 381–409). By combining these two models we can reconstruct the three-dimensional shape of the cavity at any time before pinch-off.

Type
Papers
Copyright
Copyright © Cambridge University Press 2012

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Enriquez et al. supplementary movie

Movie 1: Top view of collapse with m = 2 and a = 25% (Figure 3)

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Video 1.3 MB

Enriquez et al. supplementary movie

Movie 2: Top view of collapse with m = 3 and a = 10% (Figure 4)

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Video 1.1 MB

Enriquez et al. supplementary movie

Movie 3: Top view of collapse with m = 16 and a = 2% (Figure 5)

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Video 1.4 MB

Enriquez et al. supplementary movie

Movie 4: Side view of collapse with m = 20 and a = 4% (Figure 9)

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Video 1.6 MB

Enriquez et al. supplementary movie

Movie 5: Side view of collapse with m = 20 and a = 2% (Figure 10)

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Video 1.3 MB

Enriquez et al. supplementary movie

Movie 6: Top view of collapse with m = 6 and a = 4% (Figure 11a)

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Video 1.2 MB

Enriquez et al. supplementary movie

Movie 7: Top view of collapse with m = 6 and a = 10% (Figure 11b)

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Video 1.2 MB

Enriquez et al. supplementary movie

Movie 8: Top view of collapse with m = 6 and a = 25% (Figure 11c)

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Video 1.4 MB

Enriquez et al. supplementary movie

Movie 9: Top view of collapse with m = 3 and a = 25% (Figure 12)

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Video 1.3 MB

Enriquez et al. supplementary movie

Movie 10: Pinch-off comparison of a round disc and three discs with m = 6 disturbance. (Figure 13)

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Video 2.4 MB