Formation of the “Superconducting” Core in Turbulent Thermal Convection
J. J. Niemela, K. R. Sreenivasan
DOI 10.1103/PhysRevLett.100.184502 · Physical Review Letters
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Abstract
A sinusoidal temperature perturbation is superimposed on the bottom plate of a cylindrical convection cell, and its decay is measured at the cell midheight. Rayleigh numbers up to Ra=1013 and aspect ratios 1 and 4 are considered. The technique allows a dynamic measurement of the height of the layer interposed between the superconducting core and the boundary. This deduced height is in good agreement with results from recent numerical simulations.
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