Particle dynamics calculations of wall stresses and slip velocities for couette flow of smooth inelastic spheres

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Abstract

The objective of this work is to characterize the effects of boundary geometry on the flow of dry granular materials composed of smooth, inelastic spheres between parallel, bumpy walls in the absence of gravity. Particle dynamic simulations are done in which wall stresses and slip velocities are computed over a wide range of parameters, including shear gap height, geometry of the wall particles, wall to free particle diameter ratio, and normal restitution coefficient. Calculated wall stresses and slip velocities are found to be highly sensitive to boundary roughness, which is characterized in terms of the mean spacing value for the wall particles. Most noticeable is a pronounced stress drop for dense flows with an associated large slip velocity in a system having a narrow shear gap height.

Original languageEnglish (US)
Pages (from-to)1-20
Number of pages20
JournalContinuum Mechanics and Thermodynamics
Volume6
Issue number1
DOIs
StatePublished - Mar 1 1994

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Mechanics of Materials
  • Physics and Astronomy(all)

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