Viscous boundary layers in turbulent Rayleigh-Bénard convection
Viscous boundary layers in turbulent Rayleigh-Bénard convection
复制标题
湍流瑞利-贝纳德对流中的粘性边界层
DOI：
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发表时间：
2011
期刊：
影响因子：
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通讯作者：
R. D. Puits
中科院分区：
文献类型：
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作者：
L. Li;C. Resagk;R. D. Puits
本文给出并讨论了空气中湍流瑞利-贝纳德对流边界层内的高分辨局部速度分布。目前的工作取得了进展，我们在过去的工作（见杜Puits和Resagk，2007年），我们的实际设置允许测量壁法向速度分量w高达200 mm的距离远离墙壁。所有组件轮廓均在圆柱形盒子中进行，长宽比r = 1，普兰特数Pr = 0.7，Rayleigh数Ra = 3 × 109，Ra = 3 × 1010。在Ra = 3 × 10 ~（10）时，我们将实验结果与数值计算结果进行了比较。我们发现，从实验和数值计算的平均速度的配置文件崩溃彼此非常好，这两个平均水平速度配置文件不同于层流Blasius预测在边界层。在实验和数值计算中，中心窗口处的壁面法向平均速度趋于零。
Highly resolved local velocity profiles inside the boundary layers in turbulent Rayleigh-Bénard convection in air are presented and discussed. The present work makes progress to our work in the past (see du Puits & Resagk, 2007) that our actual set-up permits the measurement of the wall-normal velocity component w up to a distance of 200 mm away from the wall. All component profiles were performed in a cylindrical box with an aspect ratio Γ = 1, a Prandtl number Pr = 0.7 and Rayleigh numbers Ra = 3 × 109, Ra = 3 × 1010. We compare the experimental results with numerics at Ra = 3 × 1010 directly. We found that the profiles of mean velocity from both experiments and numerics collapse very well with each other and both of the mean horizontal velocity profiles differ from the laminar Blasius prediction at the boundary layer. The wall-normal mean velocity at the central window tends to zero in both experiment and numerics.