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首页> 外文期刊>European Journal of Mechanics, B. Fluids >The spherical Taylor-Couette flow
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The spherical Taylor-Couette flow

机译：球形泰勒-库埃特流

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The instability modes that lead to turbulence between two concentric spheres, the inner one rotating while the outer is at rest, are investigated through visualization and using the electrodiffusion (ED) method. The wall velocity gradients are measured for the first time in a spherical shell by ED method. The exploration of the flow regimes is carried out for a dimensionless gap width delta = (R-2 - R-1)/R-1 of 0.107, an aspect ratio Gamma = H/d over the interval (17-21) and a Taylor number in the range (22-1500). The influence of these parameters on the apparition of instabilities is elucidated. The evolution of the flow patterns is visualized and also quantified by the wall velocity gradients and their fluctuations. Using the fast Fourier transform, the time series of velocity gradient obtained by the ED method permitted analysis and identification of the fundamental frequencies and their evolution associated with each flow state. (C) 2016 Elsevier Masson SAS. All rights reserved.
机译：通过可视化和使用电扩散（ED）方法研究了导致两个同心球之间湍流的不稳定模式，内部同心球旋转而外部同心球旋转。通过ED方法首次在球形壳体中测量壁速度梯度。对流态的探索是针对无量纲的间隙宽度delta =（R-2-R-1）/ R-1为0.107，纵横比Gamma = H / d（17-21）和a泰勒数在（22-1500）范围内。阐明了这些参数对不稳定性的影响。流动模式的演变可以通过壁速度梯度及其波动进行可视化和量化。使用快速傅里叶变换，通过ED方法获得的速度梯度时间序列可以分析和识别基本频率及其与每种流动状态相关的演化。 （C）2016 Elsevier Masson SAS。版权所有。

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