Volume 83, Number 5, September 2008
|Number of page(s)||6|
|Section||Interdisciplinary Physics and Related Areas of Science and Technology|
|Published online||21 August 2008|
Fronts and trigger wave patterns in an array of oscillating vortices
Department of Physics and Astronomy, Bucknell University - Lewisburg, PA 17837, USA
Corresponding author: firstname.lastname@example.org
Accepted: 15 July 2008
We present experiments on reaction fronts and self-sustaining trigger wave patterns in an advection-reaction-diffusion system with chaotic mixing. The flow is a two-dimensional array of oscillating vortices, and the reaction is the excitable Belousov-Zhabotinsky chemical reaction. Reaction fronts are found to mode-lock for a wide range of frequencies, and the mode-locking results in “faceted” fronts that line up along the directions of the underlying vortex array. Self-sustaining trigger wave patterns are also found composed of large scale spiral and spiral-pair patterns, similar to patterns in the reaction-diffusion (no flow) limit but with a significantly larger typical length scale and with clear anisotropy that reflects the vortex array.
PACS: 82.40.Ck – Pattern formation in reactions with diffusion, flow and heat transfer / 47.70.Fw – Chemically reactive flows / 47.52.+j – Chaos in fluid dynamics
© EPLA, 2008
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