回転２球流れの層流乱流遷移過程の基本周波数と特性

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  • Fundamental frequencies and characteristics of disturbance in the laminar-turbulent transition process of the flow between two concentric spheres with the inner sphere rotating.
  • カイテン 2キュウ ナガレ ノ ソウリュウ ランリュウ センイ カテイ ノ キ

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Fundamental frequencies and characteristics of four types of disturbance in the flow between a rotating inner and a stationary outer sphere are clarified by flow visualization and spectral studies of both scattering intensity power spectra and velocity power spectra. The dependencies of the fundamental frequencies on meridional angle θ and Reynolds number Re are considered. Consequently, it is found that fS, fW, fH and fB are fundamental frequencies characterizing spiral Taylor-Gortler (T. G.) vortices, travelling azimuthal waves of toroidal T. G. vortices, shear waves within the Ekman boundary layer and an up-down fluctuation of toroidal T. G. vortices, respectively, and are independent of θ and Re. Further, the fundamental frequencies are discussed in comparison with those of a flow between two concentric cylinders with the inner one rotating.

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