Dynamics of the Oscillation Phase Distribution in the BZ Reaction

Oscillation phase dynamics in the homogeneous autooscillating Belousov-Zhabotinsky (BZ) reaction has been studied by computer simulations. The wave dynamics in autooscillating media is qualitatively di erent from those in excitable media for su ciently long waves. We propose a classi cation of chemical waves which is based on the analysis of shape of the dispersion curve. This delimits conventionally the waves with properties analogous to those in excitable media "trigger waves", from "phase waves". In particular, we study the phenomenon of "dephasing wave", recently observed experimentally [27]. This is a special form of phase wave dynamics, which looks like a propagating wave of phase triggering towards a uniform value. We show, that phase wave dynamics, including the dephasing waves, can be described in terms of the phase di usion equation, the well known Burgers equation. This description remains qualitatively valid for a wide range of wavelengths. Acknowledgments. This work was partially supported by the Russian Fund for Fundamental Research, grant No 93-011-16080 (VNB)