Decomposition of the Modulated Waves in a Rotating Couette System
Decomposition of the Modulated Waves in a Rotating Couette System
复制标题
旋转 Couette 系统中调制波的分解
DOI：
10.1126/science.263.5146.502
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发表时间：
1994
期刊：
影响因子：
56.9
通讯作者：
J. Sakakibara
中科院分区：
文献类型：
--
作者：
Y. Takeda;W. Fischer;J. Sakakibara
旋转库埃特系统中随时间变化的速度场已被分解。采用超声多普勒速度剖面法获得连续的瞬时速度剖面，并通过二维傅里叶变换对时空速度场进行分析。傅里叶谱由固有峰值描绘，并且速度场 cpan 可以仅用这些峰值分量来重建，表明速度场的成功分解。该方法表明，所谓的宽带分量是纯粹时空的、归因于混沌的分量，对应于从一卷到另一卷传播的波的全局运动。
The time-dependent velocity field in a rotating Couette system has been decomposed. Successive instantaneous velocity profiles were obtained by an ultrasonic Doppler velocity profile method, and the spatiotemporal velocity field had been analyzed by two-dimensional Fourier transform. The Fourier spectrum is depicted by intrinsic peaks, and the velocity field cpan be reconstructed with these peak components only, indicating a successful decomposition of the velocity field. This method shows that the so-called broadband component, which is purely spatiotemporal and attributed to chaos, corresponds to a global motion of the wave propagating from roll to roll.