Soriano i Fradera, JordiMercier, A.Planet Latorre, RamonHernández Machado, AuroraRodríguez, M. A.Ortín, Jordi, 1959-2019-06-182019-06-182005-08-300031-9007https://hdl.handle.net/2445/135319We report experiments on spontaneous imbibition of a viscous fluid by a model porous medium in the absence of gravity. The average position of the interface satisfies Washburn's law. Scaling of the interface fluctuations suggests a dynamic exponent z ≃ 3 , indicative of global dynamics driven by capillary forces. The complete set of exponents clearly shows that interfaces are not self-affine, exhibiting distinct local and global scaling, both for time ( β = 0.64 ± 0.02 , β ∗ = 0.33 ± 0.03 ) and space ( α = 1.94 ± 0.20 , α loc = 0.94 ± 0.10 ). These values are compatible with an intrinsic anomalous scaling scenario.4 p.application/pdfeng(c) American Physical Society, 2005Física de partículesExperimentsParticle physicsExperimentsinfo:eu-repo/semantics/article6011462019-06-18info:eu-repo/semantics/openAccess