PMID: 15244730Jul 13, 2004Paper

Hexagonal pattern instabilities in rotating Rayleigh-Bénard convection of a non-Boussinesq fluid: experimental results

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
Alessio Guarino, Valerie Vidal

Abstract

Motivated by the Küppers-Lortz instability of roll patterns in the presence of rotation, we have investigated the effects of rotation on a hexagonal pattern in Rayleigh-Bénard convection. While several theoretical models have been developed, experimental data cannot be found in the literature. In order to check the validity of the predictions and to study the effects of rotation on the behavior of the system, we present experimental results for a non-Boussinesq Rayleigh-Bénard convection with rotation about the vertical axis. Rotation introduces an additional control parameter, namely the dimensionless rotation rate Omega= 2 pi f d(2)/nu, where f is the rotation rate (in Hz), d is the thickness of the cell, and nu is the kinematic viscosity. We observe that the cell rotation induces a slow rotation of the pattern in the opposite direction (approximately Omega x 10(-4) ) in the rotating frame. Moreover, it tends to destroy the convective pattern. No oscillation of the hexagonal pattern over the range of its existence (Omega< or =6) has been observed.

References

Sep 5, 1988·Physical Review Letters·S CilibertoC Pérez-García
Nov 5, 1990·Physical Review Letters·S CilibertoC Perez-Garcia
Nov 25, 1991·Physical Review Letters·E BodenschatzD S Cannell
Sep 16, 2000·Physical Review Letters·B Echebarria, H Riecke

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Citations

Mar 4, 2011·Interdisciplinary Sciences, Computational Life Sciences·Zhao-Xue ChenFeng-Li Bei

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