Imperial College London
Alternate

Dr Paula Alejandra Gago

Faculty of Engineering, Department of Earth Science & Engineering

 
 
 
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Contact

 

p.gago

 
 
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Location

 

Royal School of MinesSouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@unpublished{Gago:2021,
author = {Gago, PA and Boettcher, S},
publisher = {arXiv},
title = {Density fluctuations in granular piles traversing the glass transition: A grain-scale characterization of the transition via the internal energy},
url = {http://arxiv.org/abs/2107.07764v1},
year = {2021}
}
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RIS format (EndNote, RefMan)

TY  - UNPB
AB  - The transition into a glassy state of a tapped granular pile is explored indetail using extensive molecular dynamics simulations. We measure the densityand density fluctuations of the ensemble of mechanically stable configurationsreached after the energy induced by the perturbation has dissipated. We showthat the peak in density fluctuations concurs with the density undergoing thetransition. We find that different horizontal sub-regions ("layers") along theheight of the pile traverse the transition in a similar manner but at distincttap intensities, demonstrating that at a given intensity certain regions of thesame pile may respond glassy while others remain equilibrated. To address thisphenomenon, we supplement the conventional approach based purely on propertiesof the static configurations with investigations of the grain-scale dynamics,induced by a tap, by which the energy is transmitted throughout the pile. Wefind that the effective energy that particles dissipate is a function of theparticles location in the pile and, moreover, that its value plays adistinctive role in the transformation between configurations. This internalenergy provides a "temperature-like" parameter that allows us to align thetransition into the glassy state for all layers as well as different annealingschedules at a critical value.
AU  - Gago,PA
AU  - Boettcher,S
PB  - arXiv
PY  - 2021///
TI  - Density fluctuations in granular piles traversing the glass transition: A grain-scale characterization of the transition via the internal energy
UR  - http://arxiv.org/abs/2107.07764v1
UR  - http://hdl.handle.net/10044/1/92965
ER  -
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