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

@article{Gago:2022:10.1126/sciadv.abl6304,
author = {Gago, P and Boettcher, S},
doi = {10.1126/sciadv.abl6304},
journal = {Science Advances},
pages = {1--7},
title = {Density fluctuations in granular piles traversing the glass transition: A grain-scale characterization via the internal energy},
url = {http://dx.doi.org/10.1126/sciadv.abl6304},
volume = {8},
year = {2022}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - The transition into a glassy state of a tapped granular pile is explored in detail using extensivemolecular dynamics simulations. We measure the density and density fluctuations of the ensembleof mechanically stable configurations reached after the energy induced by the perturbation hasdissipated. We show that the peak in density fluctuations concurs with the density undergoingthe transition. We find that different horizontal sub-regions (“layers”) along the height of the piletraverse the transition in a similar manner but at distinct tap intensities, demonstrating that at agiven intensity certain regions of the same pile may respond in a glassy manner while others remainequilibrated. To address this phenomenon, we supplement the conventional approach based purelyon properties of the static configurations with investigations of the grain-scale dynamics, inducedby a tap, by which the energy is transmitted throughout the pile. We find that the effective energythat particles dissipate is a function of each particle’s location in the pile and, moreover, that itsvalue plays a distinctive role in the transformation between configurations. This internal energyprovides a “temperature-like” parameter that allows us to align the transition into the glassy statefor all layers, as well as different annealing schedules, at a critical value.
AU  - Gago,P
AU  - Boettcher,S
DO  - 10.1126/sciadv.abl6304
EP  - 7
PY  - 2022///
SN  - 2375-2548
SP  - 1
TI  - Density fluctuations in granular piles traversing the glass transition: A grain-scale characterization via the internal energy
T2  - Science Advances
UR  - http://dx.doi.org/10.1126/sciadv.abl6304
UR  - https://www.science.org/doi/full/10.1126/sciadv.abl6304
UR  - http://hdl.handle.net/10044/1/93032
VL  - 8
ER  -
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