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Title: Pinning and Avalanches in Hydrophobic Microchannels
Author: Queralt Martín, María
Pradas Gené, Marc
Rodriguez Trujillo, Romen
Arundell, M.
Corvera Poiré, Eugenia
Hernández Machado, Aurora
Keywords: Física de partícules
Particle physics
Issue Date: 10-May-2011
Publisher: American Physical Society
Abstract: 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.
Note: Reproducció del document publicat a:
It is part of: Physical Review Letters, 2011, vol. 106, num. 19, p. 194501
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ISSN: 0031-9007
Appears in Collections:Articles publicats en revistes (Enginyeria Electrònica i Biomèdica)
Articles publicats en revistes (Física de la Matèria Condensada)

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