Plume motion and large-scale circulation in a cylindrical Rayleigh-Bénard cell

Details Plume motion and large-scale circulation in a cylindrical Rayleigh-Bénard cell Plume motion and large-scale circulation in a cylindrical Rayleigh-Bénard cell

2004-02-22

arxiv.org/abs/nlin/0402039v1

Nonlinear Sciences

Chaotic Dynamics

4 pages, 6 figures

Scientific paper

10.1103/PhysRevLett.92.194502

We used the time correlation of shadowgraph images to determine the angle $\Theta$ of the horizontal component of the plume velocity above (below) the center of the bottom (top) plate of a cylindrical Rayleigh-B\'enard cell of aspect ratio $\Gamma \equiv D/L = 1$ ($D$ is the diameter and $L \simeq 87$ mm the height) in the Rayleigh-number range $7\times 10^7 \leq R \leq 3\times 10^{9}$ for a Prandtl number $\sigma = 6$. We expect that $\Theta$ gives the direction of the large-scale circulation. It oscillates time-periodically. Near the top and bottom plates $\Theta(t)$ has the same frequency but is anti-correlated.

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