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Wave propagation in a medium with disordered excitability
Sendiña Nadal, Irene; Muñuzuri, A. P.; Vives, Daniel; Pérez Muñuzuri, Vicente; Casademunt i Viader, Jaume; Ramírez Piscina, Laureano; Sancho, José M.; Sagués i Mestre, Francesc
Universitat de Barcelona
The effect of quenched disorder on the propagation of autowaves in excitable media is studied both experimentally and numerically in relation to the light-sensitive Belousov-Zhabotinsky reaction. The spatial disorder is introduced through a random distribution with two different levels of transmittance. In one dimension the (time-averaged) wave speed is smaller than the corresponding to a homogeneous medium with the mean excitability. Contrarily, in two dimensions the velocity increases due to the roughening of the front. Results are interpreted using kinematic and scaling arguments. In particular, for d = 2 we verify a theoretical prediction of a power-law dependence for the relative change of the propagation speed on the disorder amplitude.
2010-06-08
Química física
Mecànica quàntica
Dinàmica de fluids
Chemistry, Physical and theoretical
Quantum mechanics
Fluid dynamics
(c) American Physical Society
Article
American Physical Society
         

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