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Issue 8, 2016
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Grains unchained: local fluidization of a granular packing by focused ultrasound

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Abstract

We report experimental results on the dynamics of a granular packing submitted to high-intensity focused ultrasound. Acoustic radiation pressure is shown to remotely induce local rearrangements within a pile as well as global motion around the focal spot in an initially jammed system. We demonstrate that this fluidization process is intermittent for a range of acoustic pressures and hysteretic when the pressure is cycled. Such a first-order-like unjamming transition is reproduced in numerical simulations in which the acoustic pressure field is modeled by a localized external force. Further analysis of the simulated packings suggests that in the intermittent regime unjamming is not associated with any noticeable prior structural signature. A simple two-state model based on effective temperatures is proposed to account for these findings.

Graphical abstract: Grains unchained: local fluidization of a granular packing by focused ultrasound

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Supplementary files

Article information


Submitted
18 Aug 2015
Accepted
04 Jan 2016
First published
08 Jan 2016

Soft Matter, 2016,12, 2315-2324
Article type
Paper
Author version available

Grains unchained: local fluidization of a granular packing by focused ultrasound

P. Lidon, N. Taberlet and S. Manneville, Soft Matter, 2016, 12, 2315
DOI: 10.1039/C5SM02060C

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