Defect turbulence in inclined layer convection

Details Defect turbulence in inclined layer convection Defect turbulence in inclined layer convection

2001-07-05

arxiv.org/abs/nlin/0107010v1

Nonlinear Sciences

Pattern Formation and Solitons

4 pages, 5 figures

Scientific paper

10.1103/PhysRevLett.88.034501

We report experimental results on the defect turbulent state of undulation chaos in inclined layer convection of a fluid withPrandtl number $\approx 1$. By measuring defect density and undulation wavenumber, we find that the onset of undulation chaos coincides with the theoretically predicted onset for stable, stationary undulations. At stronger driving, we observe a competition between ordered undulations and undulation chaos, suggesting bistability between a fixed-point attractor and spatiotemporal chaos. In the defect turbulent regime, we measured the defect creation, annihilation, entering, leaving, and rates. We show that entering and leaving rates through boundaries must be considered in order to describe the observed statistics. We derive a universal probability distribution function which agrees with the experimental findings.

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