Reversals of large-scale circulation in turbulent convection in rectangular cavities

被引:0
作者
A. Yu. Vasil’ev
P. G. Frick
机构
[1] Perm State University,Institute of Continuous Media Mechanics, Ural Branch
[2] Russian Academy of Sciences,undefined
来源
JETP Letters | 2011年 / 93卷
关键词
Particle Image Velocimetry; Rayleigh Number; JETP Letter; Large Scale Circulation; Rectangular Cavity;
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摘要
The behavior of large-scale circulation appearing against the background of Rayleigh-Bénard turbulent convection in rectangular cavities of various geometries (from a thin layer to a cubic cell) has been experimentally investigated. It has been shown that the regimes of large-scale circulation with spontaneous reversals separated by long periods of quasistationary circulation appear both in a limited range of the Rayleigh number and in a limited range of the aspect ratio, which determines the ratio of the thickness of a cell to the side in the circulation plane. A regime without reversals is established in a thick layer, whereas a regime characterized by numerous changes in the direction of circulation, which are not separated by intervals with the stable direction of the large-scale flow, arises in a thin layer. The spectra of oscillations of the amplitude of large-scale circulation have been analyzed. It has been shown that a dominant frequency appears in the spectrum of oscillations of the cubic cell.
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页码:330 / 334
页数:4
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