Large-scale coherent rotation and oscillation in turbulent thermal convection

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|
作者：
机构：
[1] Qiu, X.-L.
[2] Yao, S.H.
[3] Tong, P.
来源：
Qiu, X.-L. | 2000年 / American Physical Society卷 / 61期
关键词：
Doppler effect - Laser Doppler velocimeters - Heat convection;
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摘要：
Laser Doppler velocimetry is used to measure the velocity profile of turbulent thermal convection in an aspect-ratio-one cell filled with water. Velocity fluctuations are found to be homogeneous and isotropic in the turbulent bulk region. Despite the large velocity fluctuations, the mean flow field maintains a large-scale structure, which rotates and oscillates in a coherent manner. The experiment suggests a unique driving mechanism for the large-scale coherent rotation and oscillation in turbulent convection. ©2000 The American Physical Society.
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