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 - 2005
    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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