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Title: Experiments of interfacial roughening of Hele-Shaw flows with weak quenched disorder
Author: Soriano i Fradera, Jordi
Ortín, Jordi, 1959-
Hernández Machado, Aurora
Keywords: Dinàmica de fluids
Interfícies (Ciències físiques)
Pel·lícules fines
Fluid dynamics
Interfaces (Physical sciences)
Thin films
Issue Date: 2002
Publisher: The American Physical Society
Abstract: We have studied the kinetic roughening of an oil-air interface in a forced imbibition experiment in a horizontal Hele-Shaw cell with quenched disorder. Different disorder configurations, characterized by their persistence length in the direction of growth, have been explored by varying the average interface velocity v and the gap spacing b. Through the analysis of the rms width as a function of time, we have measured a growth exponent β ≃ 0.5 that is almost independent of the experimental parameters. The analysis of the roughness exponent α through the power spectrum has shown different behaviors at short ( α 1 ) and long ( α 2 ) length scales, separated by a crossover wave number q c . The values of the measured roughness exponents depend on experimental parameters, but at large velocities we obtain α 1 ≃ 1.3 independently of the disorder configuration. The dependence of the crossover wave number with the experimental parameters has also been investigated, measuring q c ∼ v 0.47 for the shortest persistence length, in agreement with theoretical predictions.
Note: Reproducció del document publicat a:
It is part of: Physical Review E, 2002, vol. E66, p. 031603-1-031603-18
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ISSN: 1063-651X
Appears in Collections:Articles publicats en revistes (Física Quàntica i Astrofísica)

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