Self-Organized Traveling Chemo-Hydrodynamic Fingers Triggered by a Chemical Oscillator

Pulsatile chemo-hydrodynamic patterns
due to a coupling between
an oscillating chemical reaction and buoyancy-driven hydrodynamic
flows can develop when two solutions of separate reactants of the
Belousov–Zhabotinsky reaction are put in contact in the gravity
field and conditions for chemical oscillations are met in the contact
zone. In regular oscillatory conditions, localized periodic changes
in the concentration of intermediate species induce pulsatile density
gradients, which, in turn, generate traveling convective fingers breaking
the transverse symmetry. These patterns are the self-organized result
of a genuine coupling between chemical and hydrodynamic modes.

由于振荡性化学反应与浮力驱动的流体动力学流动之间的耦合作用，当两种分别含有Belousov–Zhabotinsky反应独立反应物的溶液在重力场下接触，且接触区域满足化学振荡条件时，便可能形成脉动性化学-流体动力学模式。在常规振荡条件下，中间物种浓度的局部周期性变化引发脉动密度梯度，进而产生穿越对称性的迁移性对流指。这些模式是化学与流体动力学模式之间真实耦合的自组织结果。