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Convection under rotation for Prandtl numbers near 1: Kuppers-Lortz instability Yuchou Hu,1,2

Summary: Convection under rotation for Prandtl numbers near 1: Kušppers-Lortz instability
Yuchou Hu,1,2
Werner Pesch,3
Guenter Ahlers,2
and Robert E. Ecke1
Condensed-Matter and Thermal Physics and Center for Nonlinear Studies, Los Alamos National Laboratory,
Los Alamos, New Mexico 87545
Department of Physics and Center for Nonlinear Sciences, University of California at Santa Barbara,
Santa Barbara, California 93106
Physikalisches Institut der Universitašt Bayreuth, 95440 Bayreuth, Germany
Received 26 May 1998
The Kušppers-Lortz KL instability in Rayleigh-BeŽnard convection rotated about a vertical axis was studied
experimentally using optical-shadowgraph imaging in the rotating frame for dimensionless rotation rates 6
20. Two cylindrical convection cells with radius-to-height ratios 40 and 23 were used. The cells
contained CO2 at 33.1 bar and 16.6 bar with Prandtl numbers 0.93 and 0.83, respectively. Numerical
solutions of the Boussinesq equations with parameter values corresponding to the experiments were obtained
for comparison. For 40 and 8 10.5, the initial pattern above onset was time dependent. Its dynamics


Source: Ahlers, Guenter - Department of Physics, University of California at Santa Barbara
Schmidt, Matthias - Physikalisches Institut, Universität Bayreuth


Collections: Materials Science; Physics