Non-axisymmetric impact creates pineapple-shaped cavity

Enríquez, Oscar R.; Peters, Ivo R.; Gekle, Stephan; Schmidt, Laura E.; van der Meer, Devaraj; Lohse, Detlef

doi:doi:10.1063/1.3640021

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Physics of Fluids / Volume 23 / Issue 9 / GALLERY OF FLUID MOTION

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Phys. Fluids 23, 091106 (2011); http://dx.doi.org/10.1063/1.3640021 (1 page)

Non-axisymmetric impact creates pineapple-shaped cavity

Oscar R. Enríquez¹, Ivo R. Peters¹, Stephan Gekle^1,2, Laura E. Schmidt¹, Devaraj van der Meer¹, and Detlef Lohse¹

¹University of Twente, PO Box 217, 7500 AE Enschede, The Netherlands
²Technische Universität München, 85748 Garching, Germany

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(Received 16 August 2011; published online 30 September 2011)

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KEYWORDS and PACS

Keywords

air, bubbles, confined flow, flow instability, fluid oscillations, two-phase flow, water

PACS

47.55.dr

Interactions with surfaces
47.60.-i

Flow phenomena in quasi-one-dimensional systems
47.20.Ma

Interfacial instabilities (e.g., Rayleigh-Taylor)
47.55.Ca

Gas/liquid flows

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http://dx.doi.org/10.1063/1.3640021

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1070-6631 (print)

1089-7666 (online)

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L. E. Schmidt, N. C. Keim, W. W. Zhang, and S. R. Nagel, “Memory-encoding vibrations in a disconnecting air bubble,” Nature Phys. 5, 343 (2009).
R. Bergmann, D. van der Meer, S. Gekle, A. van der Bos, and D. Lohse, “Controlled impact of a disk on a water surface: cavity dynamics,” J. Fluid Mech. 633, 381 (2009).
O. R. Enríquez, I. R. Peters, S. Gekle, L. E. Schmidt, D. van der Meer, and D. Lohse , “The collapse of a non-axisymmetric, impact-created air cavity in water” (preprint, 2011).

Figures (click on thumbnails to view enlargements)

(Color) Seven snapshots of a cavity created when a round disk with an m = 20 azimuthal disturbance (shaped like a 20-petal daisy) impacts a water surface with velocity v = 1 m/s. Clearly, the 2% initial disturbance is retained until the very end, and is seen to oscillate several times during expansion and collapse. The diamond-shaped structure of the cavity near pinch-off (d), resembling the skin of a pineapple, reflects the history of these oscillations. (Time after impact: a: 33 ms, b: 77 ms, c: 95 ms, d: 104 ms, e: 107 ms, f: 125 ms, g: 200 ms.)

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