Microscopic properties and initial transients of the banded state in a rotated drum of granular material

ORAL

Abstract

We study the microscopic properties of the banded state of steel and glass beads in a rotated cylindrical drum. Imaging the top surface of the flow we can extract average velocity, drift, and diffusion. We study these properties from the start of rotation and throughout the band formation. We find that large particles begin to flow significantly faster at the region where a small particle band will form even before visible band formation. Contrary to what is expected by most modeling of the problem, we do not find any overall surface drift of small particles into like bands. We do find, however, an interesting pattern of particle drift as the particles flow down the surface. The velocity increase and the drift results show the critical importance of subsurface dynamics in driving the band formation.

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Authors

  • Michael Newey

    University of Maryland

  • Eric Hoffman

    Harris Corporation, Melbourne, FL, Department of Mechanical and Aerospace Engineering, Arizona State University, Tempe, AZ, Central Research Institute of Electric Power Industry, Cornell Univ., UC Santa Cruz, Graduate School at Tokyo University of Science, Cornell University, Westminster College, Department of Physics and Astronomy, Trinity University, San Antonio, Texas, USA, University of Chicago, Northwestern University, University of California, Irvine, Georgia Institute of Technology, Argonne National Lab, Universita' di Roma ``La Sapienza", University of Utah, McMaster University, Dept. of Mechanical Engineering, Iowa State University, Dept. MAE Rutgers University, AWE, Los Alamos National Laboratory, Center for Simulation of Advance Rockets, University of Illinois at Urbana Champaign, Universidad Nacional de Entre Rios, Argentina, Applied Mathematics Laboratory, Courant Institute of Mathematical Science, NYU, Universit\"{a}t des Saarlandes, Haverford College and University of Pennsylvania, City College of New York, The Benjamin Levich Institute, RWTH-Aachen, Department of Theoretical and Applied Mechanics, University of Illinois, Urbana, IL, Dept. of Theoretical and Applied Mechanics, University of Illinois, Hydraulic Engineer, US Army Corps of Engineers, Walla Walla District Office, Walla Walla, Washington, University of Idaho, Armament Research, Development, and Engineering Center, Laboratoire PPMD, UMR 7615 of CNRS, ESPCI, 10 rue Vauquelin, 75231 Paris Cedex 05, France, Laboratoire PMMH, UMR7636 of CNRS, and Laboratoire MSC, UMR 7057, ESPCI, 10 rue Vauquelin, 75231 Paris Cedex 05, France., California Institute of Technology, University of Minnesota-Twin Cities, University of Massachusetts-Amherst, University of Twente, Stanford University, University of Jordan, Amman, Jordan, Rutgers Univ, Dept of Mechanical and Aerospace Engineering, New York Univ, School of Med, Center for Biomedical Imaging, New York Univ, School of Medicine, Dept of Cardiothoracic Surgery, University of Marburg, U. 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