Explosions at the water surface

Adrien Benusiglio (1) , David Quéré (2) , Christophe Clanet (1)

1 LadHyX - Laboratoire d'hydrodynamique
2 PMMH - Physique et mécanique des milieux hétérogenes (UMR 7636)

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

Domaines: Mécanique des fluides [physics.class-ph]; Mécanique des fluides [physics.class-ph]

Adrien Benusiglio, David Quéré, Christophe Clanet. Explosions at the water surface. Journal of Fluid Mechanics, 2014, 752 (august), pp.123-139. ⟨10.1017/jfm.2014.255⟩. ⟨hal-01057751⟩