Experimental studies of coherent structures in an advection-reaction-diffusion system.
Experimental studies of coherent structures in an advection-reaction-diffusion system.
复制标题
平流反应扩散系统中相干结构的实验研究。
作者：
S. Gowen;T. Solomon
我们提出了一个单一的涡流与施加外部风的反应前传播的实验研究。前线是由可激发的，亚铁催化的Belousov-Zhabotinsky化学反应产生的。流动是使用电磁强迫技术产生的：几乎径向的电流与来自流体层下方的磁体的磁场相互作用以产生涡流。磁体安装在交叉的平移台上，允许涡流移动通过流动。在运动涡旋中或运动涡旋前触发的反应前沿形成了持久的结构，这些结构在实验上可用于时间无关（恒定运动）、时间周期性和时间非周期性流动。这些结果进行了检查与使用燃烧不变的流形，作为单向的障碍，在流动中的前运动。我们还探讨了有用的有限时间李雅普诺夫指数场作为一种工具，用于分析前的传播行为在流体流动。
We present experimental studies of reaction front propagation in a single vortex flow with an imposed external wind. The fronts are produced by the excitable, ferroin-catalyzed Belousov-Zhabotinsky chemical reaction. The flow is generated using an electromagnetic forcing technique: an almost-radial electrical current interacts with a magnetic field from a magnet below the fluid layer to produce the vortex. The magnet is mounted on crossed translation stages allowing for movement of the vortex through the flow. Reaction fronts triggered in or in front of the moving vortex form persistent structures that are seen experimentally for time-independent (constant motion), time-periodic, and time-aperiodic flows. These results are examined with the use of burning invariant manifolds that act as one-way barriers to front motion in the flows. We also explore the usefulness of finite-time Lyapunov exponent fields as an instrument for analyzing front propagation behavior in a fluid flow.