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Signatures of granular microstructure in dense shear flows

Author

Listed:
  • Daniel M. Mueth

    (The James Franck Institute and Department of Physics)

  • Georges F. Debregeas

    (The James Franck Institute and Department of Physics)

  • Greg S. Karczmar

    (Radiology Department)

  • Peter J. Eng

    (University of Chicago)

  • Sidney R. Nagel

    (The James Franck Institute and Department of Physics)

  • Heinrich M. Jaeger

    (The James Franck Institute and Department of Physics)

Abstract

Granular materials and ordinary fluids react differently to shear stresses. Rather than deforming uniformly, materials such as dry sand or cohesionless powders develop shear bands1,2,3,4,5—narrow zones of large relative particle motion, with essentially rigid adjacent regions. Because shear bands mark areas of flow, material failure and energy dissipation, they are important in many industrial, civil engineering and geophysical processes6. They are also relevant to lubricating fluids confined to ultrathin molecular layers7. However, detailed three-dimensional information on motion within a shear band, including the degree of particle rotation and interparticle slip, is lacking. Similarly, very little is known about how the microstructure of individual grains affects movement in densely packed material5. Here we combine magnetic resonance imaging, X-ray tomography and high-speed-video particle tracking to obtain the local steady-state particle velocity, rotation and packing density for shear flow in a three-dimensional Couette geometry. We find that key characteristics of the granular microstructure determine the shape of the velocity profile.

Suggested Citation

  • Daniel M. Mueth & Georges F. Debregeas & Greg S. Karczmar & Peter J. Eng & Sidney R. Nagel & Heinrich M. Jaeger, 2000. "Signatures of granular microstructure in dense shear flows," Nature, Nature, vol. 406(6794), pages 385-389, July.
    • Handle: RePEc:nat:nature:v:406:y:2000:i:6794:d:10.1038_35019032
    DOI: 10.1038/35019032
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    Cited by:

    1. Idrees Khan & Tiri Chinyoka & Andrew Gill, 2022. "Computational Analysis of Shear Banding in Simple Shear Flow of Viscoelastic Fluid-Based Nanofluids Subject to Exothermic Reactions," Energies, MDPI, vol. 15(5), pages 1-17, February.
    2. Jalali, Payman & Ritvanen, Jouni & Sarkomaa, Pertti, 2006. "Stress fluctuations in monodisperse and bidisperse rapid granular shear flows," Physica A: Statistical Mechanics and its Applications, Elsevier, vol. 369(2), pages 535-544.

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