High-Speed Jet Formation after Solid Object Impact


Gekle, Stephan and Gordillo, Jose Manuel and Meer, Devaraj van der and Lohse, Detlef (2009) High-Speed Jet Formation after Solid Object Impact. Physical Review Letters, 102 (3). 034502. ISSN 0031-9007

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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
Item Type:Article
Copyright:© 2009 The American Physical Society
Science and Technology (TNW)
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Link to this item:http://purl.utwente.nl/publications/73756
Official URL:https://doi.org/10.1103/PhysRevLett.102.034502
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