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| Titel |
Intermittent burst dynamics in porous media: experiments on slow drainage flows |
| VerfasserIn |
Marcel Moura, Knut Jørgen Måløy, Renaud Toussaint |
| Konferenz |
EGU General Assembly 2017
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| Medientyp |
Artikel
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| Sprache |
en
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 19 (2017) |
| Datensatznummer |
250143202
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| Publikation (Nr.) |
 EGU/EGU2017-6904.pdf |
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| Zusammenfassung |
| The intermittent burst dynamics during the slow drainage of an artificial quasi-2D porous
medium is studied experimentally. We have verified a theoretically predicted scaling for the
burst size distribution which was previously accessible only via numerical simulations. We
show 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 a scaling behavior for the power spectrum
associated with pressure fluctuations during the flow. The observation of a 1∕f
scaling region in the 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.
References:
[1] M. Moura, K. J. Måløy and R. Toussaint, Critical behavior in porous media flow, arXiv
preprint (2016).
[2] M. Moura, E.-A. Fiorentino, K. J. Måløy, G. Schäfer and R. Toussaint, Impact of sample
geometry on the measurement of pressure-saturation curves: Experiments and simulations,
Water Resour. Res., 51, 8900 (2015).
[3] M. Cieplak and M. O. Robbins, Influence of contact angle on quasistatic fluid invasion of
porous media, Phys. Rev. B, 41, 11508 (1990).
[4] M. Moura, Burst dynamics in quasi-2D disordered systems: experiments on porous media
two-phase flows, PhD thesis, University of Oslo (2016). |
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