MATCHED BOUNDARY LAYERS IN TURBULENT RAYLEIGH-BENARD CONVECTION OF MERCURY
MATCHED BOUNDARY LAYERS IN TURBULENT RAYLEIGH-BENARD CONVECTION OF MERCURY
复制标题
水星湍流瑞利-伯纳德对流中的匹配边界层
DOI：
10.1103/physreve.57.557
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发表时间：
1998
影响因子：
2.4
通讯作者：
M. Sano
中科院分区：
文献类型：
--
作者：
T. Segawa;A. Naert;M. Sano
我们分析了温度的时间序列记录在不同位置的边界层的Rayleigh-Bénard对流单体使用水银（Pr= 0.024）的瑞利数（Ra）范围从10 6到10 8。在整个范围内的Ra，几个无量纲量有独特的，Ra不变的配置文件，如果距离是由热边界层厚度归一化。这表明，在两个边界层耦合的热湍流的渐近制度。热涨落的偏度及其时间导数表明，温度涨落不是浮力驱动的，而是被动地被大部分单元的平均环流扫过。
We analyzed temperature time series recorded in different positions across the boundary layers of a Rayleigh-Bénard convection cell using mercury (Pr= 0.024) for Rayleigh numbers (Ra) ranging from 10 6 to 10 8. In the whole range of Ra, several nondimensional quantities have unique, Ra-invariant profiles, if distance is normalized by the thermal boundary layer thickness. This indicates an asymptotic regime of thermal turbulence in which two boundary layers are coupled. Skewness and its time derivative of thermal fluctuations reveal that temperature fluctuations are not buoyancy driven but passively swept by the mean circulation in most of the cell.