Forced phase diffusion in a convection experiment

Rehberg, I.; Bodenschatz, E.; Winkler, B.; Busse, F. H.

doi:10.1103/PhysRevLett.59.282

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Forced phase diffusion in a convection experiment

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Bodenschatz, E.
Laboratory for Fluid Dynamics, Pattern Formation and Biocomplexity, Max Planck Institute for Dynamics and Self-Organization, Max Planck Society;

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Rehberg, I., Bodenschatz, E., Winkler, B., & Busse, F. H. (1987). Forced phase diffusion in a convection experiment. Physical Review Letters, 59(3): 282. doi:10.1103/PhysRevLett.59.282.

Cite as: https://hdl.handle.net/21.11116/0000-0003-ECD5-3

Abstract

In a thermal-convection box the boundaries parallel to the convection rolls are replaced by ramps, i.e., smooth variations in the Rayleigh number from supercritical to subcritical values. Such a geometry selects a small wavelength band. The wavelength selected by the left and right ramps are not necessarily the same�resulting in a wavelength gradient. This gradient leads to forced phase diffusion: The convection pattern drifts from the short-wavelength end to the ramp selecting the longer wavelength. An experimental observation of this phenomenon is presented.