ASYMMETRIC MODES AND THE TRANSITION TO VORTEX STRUCTURES IN ROTATING RAYLEIGH-BENARD CONVECTION

被引:99
作者
ZHONG, F [1 ]
ECKE, R [1 ]
STEINBERG, V [1 ]
机构
[1] UNIV CALIF LOS ALAMOS SCI LAB,CTR NONLINEAR STUDIES,LOS ALAMOS,NM 87545
关键词
D O I
10.1103/PhysRevLett.67.2473
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
We report heat transport measurements and optical shadowgraph visualization of rotating Rayleigh-Benard convection. For dimensionless rotation rates 140 < OMEGA < 4300, the initial transition to convection, occurring at a Rayleigh number R much less than the linear-stability value for roll or vortex states, is a forward Hopf bifurcation to an azimuthally asymmetric state with mode number n. States with n = 3, 4, 5, 6, and 7 exist at low to moderate R and precess with frequencies that depend on R and OMEGA. At higher R there is a continuous transition to a state with noisy, time-dependent heat transport, a distinct array of vortices in the central region, and a modulation of the precession speed of the outer structures.
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页码:2473 / 2476
页数:4
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