Experimental Evidence for Three Universality Classes for Reaction Fronts in Disordered Flows.
Experimental Evidence for Three Universality Classes for Reaction Fronts in Disordered Flows.
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无序流中反应前沿的三个普遍性类别的实验证据。
DOI：
10.1103/physrevlett.114.234502
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发表时间：
2014
影响因子：
8.6
通讯作者：
KAY Joerg WIESE
中科院分区：
文献类型：
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作者：
S. Atis;A. Dubey;D. Salin;L. Talon;P. Le Doussal;KAY Joerg WIESE
受外部流动影响的无序介质中的自持反应前沿表现出自仿射粗糙化、钉扎和脱钉转变。我们测量 1+1 维度锋面的空间和时间波动，由单个参数（平均流速）控制。观察到三个不同的普遍性类别，与快速前进或后退锋面的 Kardar-Parisi-Zhang (KPZ) 类、平均流量近似抵消反应速率时的猝灭 KPZ 类（正 qKPZ）以及缓慢后退锋面的负 qKPZ 类一致。两个 qKPZ 类别都表现出明显的脱钉转变，与理论一致。
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.