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Explosions at the water surface

Published online by Cambridge University Press:  02 July 2014

Adrien Benusiglio
Affiliation:
Ladhyx, Unité Mixte de Recherche 7646, Centre National de la Recherche Scientifique-École Polytechnique, 91120 Palaiseau, France
David Quéré
Affiliation:
Physique et Mécanique des Milieux Hétérogènes, Unité Mixte de Recherche 7636, Centre National de la Recherche Scientifique-Paris 6-Paris 7-École Supérieure de Physique et de Chimie Industrielles, 75005 Paris, France
Christophe Clanet*
Affiliation:
Ladhyx, Unité Mixte de Recherche 7646, Centre National de la Recherche Scientifique-École Polytechnique, 91120 Palaiseau, France
*
Email address for correspondence: clanet@ladhyx.polytechnique.fr

Abstract

We study the shape and dynamics of cavities created by the explosion of firecrackers at the surface of a large pool of water. Without confinement, the explosion generates a hemispherical air cavity which grows, reaches a maximum size and collapses in a generic w-shape to form a final central jet. When a rigid open tube confines the firecracker, the explosion produces a cylindrical cavity that expands without ever escaping the free end of the tube. We discuss a potential flow model, which captures most of these features.

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Papers
Copyright
© 2014 Cambridge University Press 

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