Patterns and instability of grannular flow

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Dense granular flows are often observed to become unstable and form inhomogeneous structures in nature or industry. Although recently significant advances have been made in understanding simple flows, instabilities are often not understood in detail. We present experimental and numerical results that show the formation of longitudinal stripes. These arise from instability of the uniform flowing state of granular media on a rough inclined plane. The form of the stripes depends critically on the mean density of the flow with a robust form of stripes at high density that consists of fast sliding plug-like regions (stripes) on top of highly ... continued below

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Ecke, Robert E; Borzsonyi, Tamas & Mcelwaine, Jim N January 1, 2009.

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Dense granular flows are often observed to become unstable and form inhomogeneous structures in nature or industry. Although recently significant advances have been made in understanding simple flows, instabilities are often not understood in detail. We present experimental and numerical results that show the formation of longitudinal stripes. These arise from instability of the uniform flowing state of granular media on a rough inclined plane. The form of the stripes depends critically on the mean density of the flow with a robust form of stripes at high density that consists of fast sliding plug-like regions (stripes) on top of highly agitated boiling material -- a configuration reminiscent of the Leidenfrost effect when a droplet of liquid lifted by its vapor is hovering above a hot surface.

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  • Journal Name: Nature Physics

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  • Report No.: LA-UR-09-00816
  • Report No.: LA-UR-09-816
  • Grant Number: AC52-06NA25396
  • Office of Scientific & Technical Information Report Number: 956404
  • Archival Resource Key: ark:/67531/metadc931183

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  • January 1, 2009

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  • Nov. 13, 2016, 7:26 p.m.

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  • Dec. 12, 2016, 12:44 p.m.

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Ecke, Robert E; Borzsonyi, Tamas & Mcelwaine, Jim N. Patterns and instability of grannular flow, article, January 1, 2009; [New Mexico]. (digital.library.unt.edu/ark:/67531/metadc931183/: accessed October 15, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.