Session AH: Reacting Flows I

8:00 AM–10:36 AM, Sunday, November 20, 2005
Hilton Chicago Room: Williford B

Chair: Ann Karagozian, University of California, Los Angeles

Abstract ID: BAPS.2005.DFD.AH.12

Abstract: AH.00012 : Reaction patterns in a blinking vortex flow

10:23 AM–10:36 AM

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  Carolyn Nugent
  Matt Paoletti
  Tom Solomon
    (Bucknell University)

We study the patterns formed by the excitable Belousov-Zhabotinsky reaction in a blinking vortex flow produced by magnetohydrodynamic forcing. Mixing in this flow is chaotic, as has been documented extensively in previous studies. The reaction is triggered by a silver wire, and the result is a pulse (``trigger wave'') that propagates through the system. We investigate the patterns formed by the propagating pulse and compare them with theories\footnote{T. Tel, A. de Moura, C. Grebogi and G. Karolyi, Phys. Rep. 413, 91 (2005).} that predict fractal patterns determined by the unstable manifolds of the flow. We also consider ``burn-like'' reaction fronts, and compare the results with previous experiments for patterns of oscillatory reactions in this flow.

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