| Issue |
EPL
Volume 118, Number 1, April 2017
|
|
|---|---|---|
| Article Number | 14004 | |
| Number of page(s) | 7 | |
| Section | Electromagnetism, Optics, Acoustics, Heat Transfer, Classical Mechanics, and Fluid Dynamics | |
| DOI | https://doi.org/10.1209/0295-5075/118/14004 | |
| Published online | 06 June 2017 | |
Critical behavior in porous media flow
1 PoreLab, Department of Physics, University of Oslo - PO Box 1048, Blindern, N-0316, Oslo, Norway
2 Université de Strasbourg, CNRS, IPGS UMR 7516 - 5 rue René Descartes, 67000, Strasbourg, France
Received: 13 January 2017
Accepted: 16 May 2017
The intermittent burst dynamics during the slow drainage of a porous medium is studied experimentally. We have shown that this system satisfies a set of conditions known to be true for critical systems, such as intermittent activity with bursts extending over several time and length scales, self-similar macroscopic fractal structure and 
power spectrum. Additionally, we have verified a theoretically predicted scaling for the burst size distribution, previously assessed via numerical simulations. The observation of power spectra is new for porous media flows and, for specific boundary conditions, we notice the occurrence of a transition from 1/f to 1/f2 scaling. An analytically integrable mathematical framework was employed to explain this behavior.
PACS: 47.55.-t – Multiphase and stratified flows / 47.15.gp – Hele-Shaw flows / 64.60.Ht – Dynamic critical phenomena
© EPLA, 2017
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