Phys. Rev. Lett. 92, 194502 (2004) [4 pages]Plume Motion and Large-Scale Circulation in a Cylindrical Rayleigh-Bénard CellReceived 5 December 2003; published 12 May 2004 We used the time correlation of shadowgraph images to determine the angle Θ of the horizontal component of the plume velocity above (below) the center of the bottom (top) plate of a cylindrical Rayleigh-Bénard cell of aspect ratio Γ≡D/L=1 (D is the diameter and L≃87 mm is the height) in the Rayleigh-number range 7×107≤R≤3×109 for a Prandtl number σ=6. We expect that Θ gives the direction of the large-scale circulation. It oscillates time periodically. Near the top and bottom plates Θ(t) has the same frequency but is anticorrelated. © 2004 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.92.194502
DOI:
10.1103/PhysRevLett.92.194502
PACS:
47.27.Te, 44.25.+f
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