# name
Experiments of interfacial roughening of Hele-Shaw flows with weak quenched disorder

# metadata.dc.description.abstract[].value
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.

# metadata.dc.source[].value
Articles publicats en revistes (Física Quàntica i Astrofísica)

# metadata.dc.title[].value
Experiments of interfacial roughening of Hele-Shaw flows with weak quenched disorder