Details

Autor(en) / Beteiligte

• Atis, Séverine
• Dubey, Awadhesh Kumar
• Salin, Dominique
• Talon, Laurent
• Le Doussal, Pierre
• Wiese, Kay Jörg

Titel

Experimental Evidence for Three Universality Classes for Reaction Fronts in Disordered Flows

Ist Teil von

• Physical review letters, 2015-06, Vol.114 (23), p.234502-234502, Article 234502

Ort / Verlag

United States: American Physical Society

Erscheinungsjahr

2015

Link zum Volltext

Quelle

PROLA - Physical Review Online Archive

Beschreibungen/Notizen

• 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.