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), 194501. (doi:10.1103/PhysRevLett.106.194501).

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Description/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.

Item Type: Article
ISSNs: 0031-9007 (print)
1079-7114 (electronic)
Subjects: Q Science > QC Physics
Q Science > QH Natural history > QH301 Biology
Divisions: University Structure - Pre August 2011 > School of Biological Sciences
ePrint ID: 189205
Date Deposited: 31 May 2011 10:24
Last Modified: 27 Mar 2014 19:42
URI: http://eprints.soton.ac.uk/id/eprint/189205

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