HYDRODYNAMIC STABILITY AND INSTABILITY;
TURBULENT FLOWS;
CONVECTION;
AND HEAT TRANSFER;
D O I:
10.1209/0295-5075/19/3/005
中图分类号:
O4 [物理学];
学科分类号:
0702 ;
摘要:
Experimental observations of azimuthally traveling waves in rotating Rayleigh-Benard convection in a circular container are presented and described in terms of the theory of bifurcation with symmetry. The amplitude of the convective states varies as square-root-epsilon and the traveling-wave frequency depends linearly on epsilon with a finite value at onset. Here epsilon = R/R(c) - 1, where R(c) the critical Rayleigh number. The onset value of the frequency decreases to zero as the dimensionless rotation rate-OMEGA decreases to zero. These experimental observations are consistent with the presence of a Hopf bifurcation from the conduction state expected to arise when rotation breaks the reflection symmetry in vertical planes of the nonrotating apparatus.