Pattern selection in thermal convection in an annulus
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We report an analysis of the selected wave vector, as a function of the Rayleigh number, in thermal convection in annular geometry. The patterns have been studied by means of shadowgraph and, more quantitatively, with a sweeping laser beam. The selection processes have been investigated in cells of different sizes. We find that the wavevector increases for radial aspect ratios less than 2, whereas it decreases for larger aspect ratios. The thresholds for time-dependent regimes have also been measured.
PACS 47.20.BpBuoyancy-driven instability
PACS 47.25.QvConvection and heat transfer
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