Granular Eruptions: Void Collapse and Jet Formation


Mikkelsen, Rene and Versluis, Michel and Koene, Elmer and Bruggert, Gert-Wim and Meer, Devaraj van der and Weele, Ko van der and Lohse, Detlef (2002) Granular Eruptions: Void Collapse and Jet Formation. [Audio-visual material]

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Abstract:Upon impact, sand is blown away in all directions, forming a splash. The ball digs a cylindrical void in the sand and the jet is formed when this void collapses: The focused sand pressure pushes the jet straight up into the air. When the jet comes down again, it breaks up into fragments, i.e., granular clusters. For sufficiently high impact velocity, air is entrained by the collapsing void, forming an air bubble in the sand. This bubble slowly rises to the surface, and upon reaching it causes a granular eruption. This looks like a boiling liquid, or even a volcano! Gallery of Fluid Motion Award-winning entry 2002
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