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Title:Granular jets
Author(s):Thoroddsen, Sigurdur T.; Shen, Amy Q.
Abstract:Worthington jets are a familiar sight in light rain upon puddles and ponds. These narrow vertical jets are formed by the radial collapse of the liquid "craters" produced by the impacting rain drops. Such jets can also be generated by super-critically forcing the standing Faraday waves on a liquid surface and have recently been cast in the formalism of physical singularities to investigate the role of the inertial focusing and the influence of surface tension on their strength. Zeff et al. propose that during the collapse of the free-surface cavity, the surface develops a curvature singularity which is dominated by inertia and surface tension, hence generating high-energy vertical jets. We have discovered that similar narrow jets occur even for granular materials, where surface tension is absent. This new phenomenon suggests that a singularity in the surface tension force is not needed to produce such jets and raises the question whether the inertial focusing is the sole mechanism. . . .
Issue Date:2000-05
Publisher:Department of Theoretical and Applied Mechanics (UIUC)
Series/Report:TAM Reports 941
Genre:Technical Report
Publication Status:published or submitted for publication
Peer Reviewed:is peer reviewed
Date Available in IDEALS:2007-03-08
Is Version Of:Published as: Sigurdur T. Thoroddsen and Amy Q. Shen. Granular jets. Physics of Fluids, vol.13, no. 1, p 4-6 (2001). DOI: 10.1063/1.1328359. Copyright 2001 American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics.

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  • Technical Reports - Theoretical and Applied Mechanics (TAM)
    TAM technical reports include manuscripts intended for publication, theses judged to have general interest, notes prepared for short courses, symposia compiled from outstanding undergraduate projects, and reports prepared for research-sponsoring agencies.

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