Measurement of Dispersion Relation of Chemical Waves in an Oscillatory Reacting Medium.

摘要

Nonlinear reactions with a sufficiently complex reaction mechanism, maintained far from equilibrium, can transmit and sustain chemical waves or fronts that are traveling chemical concentration gradients. There have been many visual observations of chemical waves, including kinematic waves, relaxation oscillation waves, and phase waves. The techniques, are being used to determine the velocity, profiles of fronts, invariance of structure in relaxation oscillation waves, and the formation of stationary spatial structures. We report measurements of the dispersion relation for chemical trigger waves propagating in an oscillatory Belousov-Zhabotinsky reacting medium. The waves are induced by a temperature perturbation (laser heating). The results are in qualitative agreement with a theory of such waves in an excitable medium. Reprints. (AW)