Monitoring three-dimensional packings in microgravity.

Peidong Yu, S. Frank-Richter, Alexander Börngen, Matthias Sperl

    Research output: Contribution to journalArticleAcademicpeer-review

    10 Citations (Scopus)

    Abstract

    We present results from experiments with granular packings in three dimensions in microgravity as realized on parabolic flights. Two different techniques are employed to monitor the inside of the packings during compaction: (1) X-ray radiography is used to measure in transmission the integrated fluctuations of particle positions. (2) Stress-birefringence in three dimensions is applied to visualize the stresses inside the packing. The particle motions below the transition into an arrested packing are found to produce a well agitated state. At the transition, the particles lose their energy quite rapidly and form a stress network. With both methods, non-arrested particles (rattlers) can be identified. In particular, it is found that rattlers inside the arrested packing can be excited to appreciable dynamics by the rest-accelerations (g-jitter) during a parabolic flight without destroying the packings. At low rates of compaction, a regime of slow granular cooling is identified. The slow cooling extends over several seconds, is described well by a linear law, and terminates in a rapid final collapse of dynamics before complete arrest of the packing.
    Original languageEnglish
    Pages (from-to)165-173
    Number of pages9
    JournalGranular matter
    Volume16
    Issue number2
    DOIs
    Publication statusPublished - 21 Jan 2014

    Keywords

    • METIS-308943
    • IR-94037

    Fingerprint Dive into the research topics of 'Monitoring three-dimensional packings in microgravity.'. Together they form a unique fingerprint.

    Cite this