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Avalanches and non-gaussian fluctuations of the global velocity of imbibition fronts

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We present an experimental study of the global velocity V ( t ) of a viscous fluid interface during forced-flow imbibition in a disordered medium. Our high resolution setup shows that the fronts display an intermittent behavior signature of a burstlike dynamics, with power-law distributed avalanches. When measured at scales comparable to the correlation length, velocity fluctuations follow an asymmetric non-Gaussian distribution, whose skewness increases with decreasing measuring window and/or injection flow rate, offering the effective number of degrees of freedom probed in our experiment.

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Articles publicats en revistes (Física de la Matèria Condensada)

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Avalanches and non-gaussian fluctuations of the global velocity of imbibition fronts