Experimental evidence for three universality classes for reaction fronts in disordered flows
Statistical Mechanics
2015-07-21 v2
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 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 quenched KPZ classes exhibit distinct depinning transitions, in agreement with the theory.
Keywords
Cite
@article{arxiv.1410.1097,
title = {Experimental evidence for three universality classes for reaction fronts in disordered flows},
author = {Séverine Atis and Awadhesh Kumar Dubey and Dominique Salin and Laurent Talon and Pierre Le Doussal and Kay Jörg Wiese},
journal= {arXiv preprint arXiv:1410.1097},
year = {2015}
}