16. BZ反応における流体現象と動的パターン形成(パターン形成、運動と統計,研究会報告)

Abstract

Hydrodynamic instabilities in a reactive liquid induced by the propagation of waves of chemical activity (chemical waves) are investigated for ferroincatalyzed Belousov-Zhabotinsky (BZ) reaction by 2D spectorophotometry and 2D veloci metry based on microscope video imaging techniques. Oscillations of the hydrodynamic flow were detected in rotating spiral waves with an open liquid/gas interface. Periodically varying deformations and irregular decompositions of chemical wave profiles were also observed in the reactive layer. These are due to an oscillatory hydrodynamic flow detected close to the layer surface. A model explaining the onset of oscillatory surface flow and dynamic pattern deformation is discussed. New mechanisms of chemical entrainment and curvature effect on chemical wave are introduced for the hydrodynamic instabilities in BZ-reaction.