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Silo outflow of soft frictionless spheres

Ahmed Ashour1,2, Torsten Trittel1, Tamás Börzsönyi3, and Ralf Stannarius1

  • 1Institute for Experimental Physics, Otto von Guericke University, Magdeburg, Germany
  • 2Faculty of Engineering and Technology, Future University, End of 90th Street, New Cairo, Egypt
  • 3Institute for Solid State Physics and Optics, Wigner Research Center for Physics, Hungarian Academy of Sciences, Budapest, Hungary

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Phys. Rev. Fluids 2, 123302 – Published 13 December, 2017

DOI: https://doi.org/10.1103/PhysRevFluids.2.123302

Abstract

Outflow of granular materials from silos is a remarkably complex physical phenomenon that has been extensively studied with simple objects like monodisperse hard disks in two dimensions (2D) and hard spheres in 2D and 3D. For those materials, empirical equations were found that describe the discharge characteristics. Softness adds qualitatively new features to the dynamics and to the character of the flow. We report a study of the outflow of soft, practically frictionless hydrogel spheres from a quasi-2D bin. Prominent features are intermittent clogs, peculiar flow fields in the container, and a pronounced dependence of the flow rate and clogging statistics on the container fill height. The latter is a consequence of the ineffectiveness of Janssen's law: the pressure at the bottom of a bin containing hydrogel spheres grows linearly with the fill height.

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Outline

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Phys. Rev. Fluids 2, 123302– Published 13 December, 2017
  • Received 16 June 2017
  • Revised 21 August 2017

©2017 American Physical Society

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