Granular Eruptions: Void Collapse and Jet Formation

R. Mikkelsen, Michel Versluis, Elmer Koene, Gert-Wim Bruggert, Roger M. van der Meer, J.P. van der Weele, Detlef Lohse

Research output: Non-textual formDigital or Visual ProductsOther research output

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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
Original languageUndefined
Publication statusPublished - 2002

Keywords

  • IR-57533

Cite this

Mikkelsen, R. (Author), Versluis, M. (Author), Koene, E. (Author), Bruggert, G-W. (Author), van der Meer, R. M. (Author), van der Weele, J. P. (Author), & Lohse, D. (Author). (2002). Granular Eruptions: Void Collapse and Jet Formation. Digital or Visual Products, Retrieved from http://pof.tnw.utwente.nl/3_research/files/gallery.mpg