Abstract:
Thermal measurements probe time dependence in a convecting helium layer with cylindrical geometry and aspect ratios radiusheight in the range 2.4< <22. For all, there is a first transition at a Rayleigh number R1>Rc where convection begins at Rc. Time dependence occurs for R>R1 when 4. The character of the transition at R1 is identified over the full range of. As becomes large R1Rc 1.09, a value which is difficult to reconcile with predictions for the expected skewed varicose instability. © 1984 The American Physical Society.
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