Bulletin of the American Physical Society
60th Annual Meeting of the Divison of Fluid Dynamics
Volume 52, Number 12
Sunday–Tuesday, November 18–20, 2007; Salt Lake City, Utah
Session EJ: Chaos and Fractals II
4:10 PM–5:15 PM,
Sunday, November 18, 2007
Salt Palace Convention Center Room: 250 D
Chair: Tom Solomon, Bucknell University
Abstract ID: BAPS.2007.DFD.EJ.2
Abstract: EJ.00002 : Frozen fronts in cellular flows*
4:23 PM–4:36 PM
Preview Abstract Abstract
We present experiments showing that cellular flows often freeze the motion of chemical fronts in the presence of an opposing uniform wind. Fronts pin to the vortex structure in a chain of counter-rotating vortices for a wide range of imposed wind speeds that grows nonlinearly with the strength of the underlying vorticity. The same phenomenon is observed in a two-dimensional, spatially-disordered array of vortices, indicating that the ability to pin fronts is a general property of vortices. We further investigate the strength of the pinning with the addition of a time-periodic (oscillatory) wind, introducing chaotic advection and potential effects of mode-locking. These results demonstrate that any general theory of advection-reaction-diffusion dynamics will have to account for the tendency of cellular structures to pin fronts.
*Supported by NSF Grants DMR-0404961, DMR-0703635 and PHY-0552790.
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2007.DFD.EJ.2
The American Physical Society (APS) is a non-profit membership organization working to advance the knowledge of physics.
1 Physics Ellipse, College Park, MD 20740-3844
Editorial Office 1 Research Road, Ridge, NY 11961-2701 (631) 591-4000
Office of Public Affairs 529 14th St NW, Suite 1050, Washington, D.C. 20045-2001 (202) 662-8700