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.1
Abstract: EJ.00001 : Stretching, break-up and coarsening in a flow with chaotic advection*
4:10 PM–4:23 PM
Preview Abstract Abstract
We present experimental studies of the behavior of drops of an immiscible impurity in time-periodic flows that exhibit chaotic mixing. Two flows are used: a blinking vortex flow and a 2D array of oscillating vortices. The immiscible impurity is a fluorescent oil that floats in a thin layer on the surface of the flow. Large oil droplets are broken up by advection, whereas small droplet coalesce. The balance between these effects results in a distribution of oil droplets and tendrils. We measure the spectrum of this distribution and investigate how this spectrum evolves in time and varies with the strength of the flow. We also investigate the time-dependent stretching and relaxation of individual droplets, relating this behavior to the time-variation of a ``Lagrangian Capillary Number'' which is based on finite-time Lyapunov exponents.
*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.1
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