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Pinning and avalanches in hydrophobic microchannels

Queralt-Martín, M.; Pradas, M.; Rodríguez-Trujillo, R.; Arundell, M.; Corvera Poiré, E. and Hernández-Machado, A. (2011). Pinning and avalanches in hydrophobic microchannels. Physical Review Letters, 106(19), article no. 194501.

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Rare events appear in a wide variety of phenomena such as rainfall, floods, earthquakes, and risk. We demonstrate that the stochastic behavior induced by the natural roughening present in standard microchannels is so important that the dynamics for the advancement of a water front displacing air has plenty of rare events. We observe that for low pressure differences the hydrophobic interactions of the water front with the walls of the microchannel put the front close to the pinning point. This causes a burstlike dynamics, characterized by series of pinning and avalanches, that leads to an extreme-value Gumbel distribution for the velocity fluctuations and a nonclassical time exponent for the advancement of the mean front position as low as 0.38.

Item Type: Journal Item
Copyright Holders: 2011 American Physical Society
ISSN: 1079-7114
Project Funding Details:
Funded Project NameProject IDFunding Body
Not SetFIS2009- 12964-C05-02MICINN
Not SetSGR-2009-0014DURSI
MultiflowNot SetEU-FP7 ITN
Not Set83149CONACYT
Extra Information: 4 pp.
Academic Unit/School: Faculty of Science, Technology, Engineering and Mathematics (STEM) > Mathematics and Statistics
Faculty of Science, Technology, Engineering and Mathematics (STEM)
Item ID: 41211
Depositing User: Marc Pradas
Date Deposited: 03 Nov 2014 10:56
Last Modified: 07 Dec 2018 10:26
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