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Issue 29, 2014
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A dynamic synchrotron X-ray imaging study of effective temperature in a vibrated granular medium

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Abstract

We present a dynamic synchrotron X-ray imaging study of the effective temperature Teff in a vibrated granular medium. By tracking the directed motion and the fluctuation dynamics of the tracers inside, we obtained Teff of the system using the Einstein relationship. We found that as the system unjams with increasing vibration intensities Γ, the structural relaxation time τ increases substantially which can be fitted by an Arrhenius law using Teff. And the characteristic energy scale of structural relaxation yielded by the Arrhenius fitting is E = 0.20 ± 0.02pd3, where p is the pressure and d is the background particle diameter, which is consistent with those from hard sphere simulations in which the structural relaxation happens via the opening up of free volume against pressure.

Graphical abstract: A dynamic synchrotron X-ray imaging study of effective temperature in a vibrated granular medium

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Publication details

The article was received on 19 Mar 2014, accepted on 09 May 2014 and first published on 13 May 2014


Article type: Paper
DOI: 10.1039/C4SM00602J
Author version available: Download Author version (PDF)
Citation: Soft Matter, 2014,10, 5398-5404
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    A dynamic synchrotron X-ray imaging study of effective temperature in a vibrated granular medium

    Y. Cao, X. Zhang, B. Kou, X. Li, X. Xiao, K. Fezzaa and Y. Wang, Soft Matter, 2014, 10, 5398
    DOI: 10.1039/C4SM00602J

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