Topological inversions in coalescing granular media control fluid-flow regimes

Fabian B. Wadsworth, Jérémie Vasseur, Edward W. Llewellin, Katherine J. Dobson, Mathieu Colombier, Felix W. von Aulock, Julie L. Fife, Sebastian Wiesmaier, Kai-Uwe Hess, Bettina Scheu, Yan Lavallée, Donald B. Dingwell

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

Sintering - or coalescence - of viscous droplets is an essential process in many natural and industrial scenarios. Current physical models of the dynamics of sintering are limited by the lack of an explicit account of the evolution of microstructural geometry. Here, we use high-speed time-resolved x-ray tomography to image the evolving geometry of a sintering system of viscous droplets, and use lattice Boltzmann simulations of creeping fluid flow through the reconstructed pore space to determine its permeability. We identify and characterize a topological inversion, from spherical droplets in a continuous interstitial gas, to isolated bubbles in a continuous liquid. We find that the topological inversion is associated with a transition in permeability-porosity behavior, from Stokes permeability at high porosity, to percolation theory at low porosity. We use these findings to construct a unified physical description that reconciles previously incompatible models for the evolution of porosity and permeability during sintering.

Original languageEnglish
Article number033113
Number of pages6
JournalPhysical Review E
Volume96
Issue number3
DOIs
Publication statusPublished - 25 Sep 2017
Externally publishedYes

Fingerprint

Granular Media
Sintering
Porosity
Permeability
coalescing
fluid flow
Fluid Flow
Inversion
inversions
porosity
sintering
permeability
Creeping Flow
X-ray Tomography
Percolation Theory
Lattice Boltzmann
Coalescence
Physical Model
Stokes
Bubble

Keywords

  • X-ray tomography
  • fluid dynamics
  • drop interactions

Cite this

Wadsworth, F. B., Vasseur, J., Llewellin, E. W., Dobson, K. J., Colombier, M., von Aulock, F. W., ... Dingwell, D. B. (2017). Topological inversions in coalescing granular media control fluid-flow regimes. Physical Review E, 96(3), [033113]. https://doi.org/10.1103/PhysRevE.96.033113
Wadsworth, Fabian B. ; Vasseur, Jérémie ; Llewellin, Edward W. ; Dobson, Katherine J. ; Colombier, Mathieu ; von Aulock, Felix W. ; Fife, Julie L. ; Wiesmaier, Sebastian ; Hess, Kai-Uwe ; Scheu, Bettina ; Lavallée, Yan ; Dingwell, Donald B. / Topological inversions in coalescing granular media control fluid-flow regimes. In: Physical Review E. 2017 ; Vol. 96, No. 3.
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Wadsworth, FB, Vasseur, J, Llewellin, EW, Dobson, KJ, Colombier, M, von Aulock, FW, Fife, JL, Wiesmaier, S, Hess, K-U, Scheu, B, Lavallée, Y & Dingwell, DB 2017, 'Topological inversions in coalescing granular media control fluid-flow regimes', Physical Review E, vol. 96, no. 3, 033113. https://doi.org/10.1103/PhysRevE.96.033113

Topological inversions in coalescing granular media control fluid-flow regimes. / Wadsworth, Fabian B.; Vasseur, Jérémie; Llewellin, Edward W.; Dobson, Katherine J.; Colombier, Mathieu; von Aulock, Felix W.; Fife, Julie L.; Wiesmaier, Sebastian; Hess, Kai-Uwe; Scheu, Bettina; Lavallée, Yan; Dingwell, Donald B.

In: Physical Review E, Vol. 96, No. 3, 033113, 25.09.2017.

Research output: Contribution to journalArticle

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AU - Wadsworth, Fabian B.

AU - Vasseur, Jérémie

AU - Llewellin, Edward W.

AU - Dobson, Katherine J.

AU - Colombier, Mathieu

AU - von Aulock, Felix W.

AU - Fife, Julie L.

AU - Wiesmaier, Sebastian

AU - Hess, Kai-Uwe

AU - Scheu, Bettina

AU - Lavallée, Yan

AU - Dingwell, Donald B.

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Wadsworth FB, Vasseur J, Llewellin EW, Dobson KJ, Colombier M, von Aulock FW et al. Topological inversions in coalescing granular media control fluid-flow regimes. Physical Review E. 2017 Sep 25;96(3). 033113. https://doi.org/10.1103/PhysRevE.96.033113