Boundary layers in turbulent Rayleigh-B'enard convection in air
Boundary layers in turbulent Rayleigh-B'enard convection in air
复制标题
空气中瑞利-Benard 湍流对流的边界层
DOI：
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发表时间：
2012
期刊：
影响因子：
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通讯作者：
A. Thess
中科院分区：
文献类型：
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作者：
R. D. Puits;Johannes Rilk;C. Resagk;A. Thess
在这个流体动力学视频中，矩形Rayleigh-B 'enard对流单元中的边界层流动已经可视化。实验在瑞利数Ra=1.3的空气中进行 x = 10^{10}$和普朗特数Pr=0.7$。在加热板的选定位置捕获的各种序列表明，边界层是一个非常短暂的流动区域，其特征是永久演变的相干结构。在大尺度环流冲击或离开底板的区域，它变得完全湍流。
The boundary layer flow in a Rayleigh-B'enard convection cell of rectangular shape has been visualized in this fluid dynamics video. The experiment has been undertaken in air at a Rayleigh number $Ra=1.3 imes 10^{10}$ and a Prandtl number $Pr=0.7$. Various sequences captured at selected positions of the heating plate show that the boundary layer is a very transient flow region characterized by coherent structures that permanently evolve. It becomes fully turbulent in the areas where the large-scale circulation impinge or leave the bottom plate.