Title:
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Wave propagation in a medium with disordered excitability
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Author:
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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
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Other authors:
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Universitat de Barcelona |
Abstract:
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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. |
Subject(s):
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-Química física -Mecànica quàntica -Dinàmica de fluids -Chemistry, Physical and theoretical -Quantum mechanics -Fluid dynamics |
Rights:
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(c) American Physical Society, 1998
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Document type:
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Article Article - Published version |
Published by:
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American Physical Society
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