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Related Experiment Videos

Slowly sheared dense granular flows: crystallization and nonunique final states.

J-C Tsai1, J P Gollub

  • 1Department of Physics, Haverford College, Haverford, Pennsylvania 19041, USA.

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|November 5, 2004
PubMed
Summary

Dense granular packing undergoing shear flow can crystallize, leading to decreased volume and shear force. The flow

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Area of Science:

  • Physics
  • Materials Science
  • Rheology

Background:

  • Granular materials exhibit complex behavior under shear.
  • Understanding their flow properties is crucial for various applications.

Purpose of the Study:

  • To investigate the crystallization transition in dense granular shear flow.
  • To analyze the relationship between internal structure, volume, and shear force.

Main Methods:

  • Simultaneous time-resolved measurements of internal structure, granular volume, and boundary shear force.
  • Controlled shearing of dense granular packing under a fixed normal load.

Main Results:

  • Identified features of the crystallization transition in deep shear flow.

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  • Observed significant decrease in granular volume and shear force during crystallization.
  • Noted a more rapid falloff of particle velocity with depth in the crystallized state.
  • Demonstrated that boundary conditions and prior shear history influence final packing states (crystallized or disordered).

    • Conclusions:

    • Granular packing crystallization is sensitive to boundary conditions and shear history.
    • Nonunique final states can arise even with identical boundary conditions.
    • Prior history significantly impacts granular packing rheology and long-term evolution.