Microstructure and stress differences in shearing flows

O. R. Walton, H. Kim, Anthony Rosato

Research output: Chapter in Book/Report/Conference proceedingConference contribution

18 Scopus citations

Abstract

Steady shearing flows of highly inelastic particles are simulated using rigid and slightly deformable sphere models. Large first normal stress differences in small systems are observed, which are consistent with the recent kinetic theory of Richman and Chou [1989] at low solids fractions and restitution coefficients. However, as the number of particles in the system increases, the stress difference deviates (with significantly larger values) from the theoretical predictions in a small range of solids fractions near 0.1. Long-time fluctuations of the total kinetic energy in the calculational cell coupled with visualizations of the particle positions in this solids fraction range clearly indicate the existence of a granular mocrostructure, characterized by the formation and break-up of particle clusters in the flow. A different type of microstructure is exhibited in the dense solids fraction region in which particle contacts occur at approximately 45° in the shearing plane.

Original languageEnglish (US)
Title of host publicationMechanics Computing in 1990's and Beyond
EditorsHojjat Adeli, Robert L. Sierakowski
PublisherPubl by ASCE
Pages1249-1253
Number of pages5
ISBN (Print)0872628043
StatePublished - Jan 1 1991
Externally publishedYes
EventASCE Engineering Mechanics Specialty Conference - Columbus, OH, USA
Duration: May 20 1991May 22 1991

Other

OtherASCE Engineering Mechanics Specialty Conference
CityColumbus, OH, USA
Period5/20/915/22/91

All Science Journal Classification (ASJC) codes

  • Engineering(all)

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