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High-Speed Jet Formation after Solid Object Impact

Stephan Gekle, José Manuel Gordillo, Devaraj van der Meer, and Detlef Lohse
Phys. Rev. Lett. 102, 034502 – Published 23 January 2009
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Abstract

A circular disc hitting a water surface creates an impact crater which after collapse leads to a vigorous jet. Upon impact an axisymmetric air cavity forms and eventually pinches off in a single point halfway down the cavity. Two fast sharp-pointed jets are observed shooting up- and downwards from the closure location, which by then has turned into a stagnation point surrounded by a locally hyperbolic flow pattern. This flow, however, is not the mechanism feeding the jets. Using high-speed imaging and numerical simulations we show that jetting is fed by the local flow around the base of the jet, which is forced by the colliding cavity walls. We show how the well-known theory of a collapsing void (using a line of sinks on the symmetry axis) can be continued beyond pinch-off to obtain a new and quantitative model for jet formation which agrees well with numerical and experimental data.

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  • Received 24 September 2008

DOI:https://doi.org/10.1103/PhysRevLett.102.034502

©2009 American Physical Society

Authors & Affiliations

Stephan Gekle1, José Manuel Gordillo2, Devaraj van der Meer1, and Detlef Lohse1

  • 1Department of Applied Physics and J. M. Burgers Centre for Fluid Dynamics, University of Twente, P.O. Box 217, 7500 AE Enschede, The Netherlands
  • 2Área de Mecánica de Fluidos, Departamento de Ingenería Aeroespacial y Mecánica de Fluidos, Universidad de Sevilla, Avenida de los Descubrimientos s/n 41092, Sevilla, Spain

See Also

Why Dropping a Stone Makes a Jet

JR Minkel
Phys. Rev. Focus 23, 3 (2009)

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Vol. 102, Iss. 3 — 23 January 2009

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