Reversibility and effective temperature in jammed granular matter

C. Song, P. Wang, J. Brujić, H. A. Makse

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

Abstract

We review experimental progress toward the understanding of a thermodynamic formulation of jammingingranular matter. Asaprelude of the dynamical measurements, westudyanovel compaction procedure at varying confining oscillatory pressures which ensures that the granular system has reached a reversible jammed state, i.e., the state of the system does not depend on the path taken despite the path dependency in the particle interactions. We then investigate the existence of an effective temperature with a thermodynamic meaning for jammed granular matter. The measurement of the effective temperature is realized in the laboratory by slowly shearing a closely-packed ensemble of spherical beads confined by an external pressure in a Couette geometry. All the probe particles, independent of their characteristic features and the shear rate, equilibrate at the same temperature, given by the packing density of the system. This suggests that the effective temperature is a physical variable for the nearly jammed system.

Original languageEnglish (US)
Title of host publicationPowders and Grains 2005 - Proceedings of the 5th International Conference on Micromechanics of Granular Media
Pages387-391
Number of pages5
StatePublished - Dec 1 2005
Externally publishedYes
Event5th International Conference on the Micromechanics of Granular Media: Powders and Grains 2005 - Stuttgart, Germany
Duration: Jul 18 2005Jul 22 2005

Publication series

NamePowders and Grains 2005 - Proceedings of the 5th International Conference on Micromechanics of Granular Media
Volume1

Other

Other5th International Conference on the Micromechanics of Granular Media: Powders and Grains 2005
CountryGermany
CityStuttgart
Period7/18/057/22/05

ASJC Scopus subject areas

  • Materials Science (miscellaneous)

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  • Cite this

    Song, C., Wang, P., Brujić, J., & Makse, H. A. (2005). Reversibility and effective temperature in jammed granular matter. In Powders and Grains 2005 - Proceedings of the 5th International Conference on Micromechanics of Granular Media (pp. 387-391). (Powders and Grains 2005 - Proceedings of the 5th International Conference on Micromechanics of Granular Media; Vol. 1).