Collapsing granular beds: The role of interstitial air

Tess Homan, Christa Gjaltema, Devaraj van der Meer

Research output: Contribution to journalArticleAcademicpeer-review

6 Citations (Scopus)
25 Downloads (Pure)

Abstract

A prefluidized sand bed consisting of fine particles compactifies when it is subjected to a shock. We observe that the response depends on both the shock strength and the ambient pressure, where, counterintuitively, at high ambient pressure the compaction is larger, which we connect to a decrease of the static friction inside the bed. We find that the interstitial air is trapped inside the bed during and long after compaction. We deduce this from measuring the pressure changes above and below the bed: The top pressure decreases abruptly, on the time scale of the compaction, whereas that below the bed slowly rises to a maximum. Subsequently, both gently relax to ambient values. We formulate a one-dimensional diffusion model that uses only the change in bed height and the ambient pressure as an input, and we show that it leads to a fully quantitative understanding of the measured pressure variations.
Original languageEnglish
Article number052204
Number of pages7
JournalPhysical review E: covering statistical, nonlinear, biological, and soft matter physics
Volume89
DOIs
Publication statusPublished - 2014

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Collapsing
beds
interstitials
Compaction
air
Shock
shock
static friction
Decrease
Diffusion Model
One-dimensional Model
sands
Deduce
Friction

Keywords

  • METIS-303538
  • IR-90664

Cite this

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title = "Collapsing granular beds: The role of interstitial air",
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Collapsing granular beds : The role of interstitial air. / Homan, Tess; Gjaltema, Christa; van der Meer, Devaraj.

In: Physical review E: covering statistical, nonlinear, biological, and soft matter physics, Vol. 89, 052204, 2014.

Research output: Contribution to journalArticleAcademicpeer-review

TY - JOUR

T1 - Collapsing granular beds

T2 - The role of interstitial air

AU - Homan, Tess

AU - Gjaltema, Christa

AU - van der Meer, Devaraj

N1 - Selected as Editors' Choice

PY - 2014

Y1 - 2014

N2 - A prefluidized sand bed consisting of fine particles compactifies when it is subjected to a shock. We observe that the response depends on both the shock strength and the ambient pressure, where, counterintuitively, at high ambient pressure the compaction is larger, which we connect to a decrease of the static friction inside the bed. We find that the interstitial air is trapped inside the bed during and long after compaction. We deduce this from measuring the pressure changes above and below the bed: The top pressure decreases abruptly, on the time scale of the compaction, whereas that below the bed slowly rises to a maximum. Subsequently, both gently relax to ambient values. We formulate a one-dimensional diffusion model that uses only the change in bed height and the ambient pressure as an input, and we show that it leads to a fully quantitative understanding of the measured pressure variations.

AB - A prefluidized sand bed consisting of fine particles compactifies when it is subjected to a shock. We observe that the response depends on both the shock strength and the ambient pressure, where, counterintuitively, at high ambient pressure the compaction is larger, which we connect to a decrease of the static friction inside the bed. We find that the interstitial air is trapped inside the bed during and long after compaction. We deduce this from measuring the pressure changes above and below the bed: The top pressure decreases abruptly, on the time scale of the compaction, whereas that below the bed slowly rises to a maximum. Subsequently, both gently relax to ambient values. We formulate a one-dimensional diffusion model that uses only the change in bed height and the ambient pressure as an input, and we show that it leads to a fully quantitative understanding of the measured pressure variations.

KW - METIS-303538

KW - IR-90664

U2 - 10.1103/PhysRevE.89.052204

DO - 10.1103/PhysRevE.89.052204

M3 - Article

VL - 89

JO - Physical review E: covering statistical, nonlinear, biological, and soft matter physics

JF - Physical review E: covering statistical, nonlinear, biological, and soft matter physics

SN - 2470-0045

M1 - 052204

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