Schedule Aug 19, 2003
Order, chaos, and defect statistics in inclined layer convection
Karen Daniels (Duke University)

I will describe experiments on pattern formation in thermally driven convection in an inclined, spatially extended fluid layer. Of particular interest is the defect-turbulent state dubbed "undulation chaos." We describe this state using both defect trajectories and local wavenumber measurements. We characterize the ensemble of defect trajectories according to their velocities, diffusion, and gain and loss rates. In addition, for some parameter values the system displays competition and bistability between ordered undulations and undulation chaos. The transition to this competition is described in terms of the spatial correlation length and the spectral entropy, which are found to be related to defect density.

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