title: Experimental Evidence for Three Universality Classes for Reaction Fronts in Disordered Flows.
abstract: Self-sustained reaction fronts in a disordered medium subject to an external flow display self-affine roughening, pinning, and depinning transitions. We measure spatial and temporal fluctuations of the front in 1+1 dimensions, controlled by a single parameter, the mean flow velocity. Three distinct universality classes are observed, consistent with the Kardar-Parisi-Zhang (KPZ) class for fast advancing or receding fronts, the quenched KPZ class (positive-qKPZ) when the mean flow approximately cancels the reaction rate, and the negative-qKPZ class for slowly receding fronts. Both qKPZ classes exhibit distinct depinning transitions, in agreement with the theory.
authors.affiliation: FAST, CNRS, UPSud, UPMC, UMR 7608, Batiment 502, Campus Universitaire, 91405 Orsay, France.
authors.forename: Séverine
authors.initials: S
authors.lastname: Atis
authors.affiliation: FAST, CNRS, UPSud, UPMC, UMR 7608, Batiment 502, Campus Universitaire, 91405 Orsay, France.
authors.forename: Awadhesh Kumar
authors.initials: AK
authors.lastname: Dubey
authors.affiliation: FAST, CNRS, UPSud, UPMC, UMR 7608, Batiment 502, Campus Universitaire, 91405 Orsay, France.
authors.forename: Dominique
authors.initials: D
authors.lastname: Salin
authors.affiliation: FAST, CNRS, UPSud, UPMC, UMR 7608, Batiment 502, Campus Universitaire, 91405 Orsay, France.
authors.forename: Laurent
authors.initials: L
authors.lastname: Talon
authors.affiliation: CNRS-Laboratoire de Physique Théorique de l'Ecole Normale Supérieure, 24 rue Lhomond, 75005 Paris, France.
authors.forename: Pierre
authors.initials: P
authors.lastname: Le Doussal
authors.affiliation: CNRS-Laboratoire de Physique Théorique de l'Ecole Normale Supérieure, 24 rue Lhomond, 75005 Paris, France.
authors.forename: Kay Jörg
authors.initials: KJ
authors.lastname: Wiese
mesh_terms: D004058:Diffusion; D050866:Liquid Crystals; D008962:Models, Theoretical; D017711:Nonlinear Dynamics