テイラークエット流れにおける変調波動の発生に関する実験的研究(境界層・せん断流・遷移(6),一般講演)

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  • Experimental investigation for onset of modulated wave in Taylor-Couette flow

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We investigated azimuthal behaviors of Taylor-Couette flow on the azimuthal cross section by flow visualization using Kalliroscope flakes, and by image analysis of the obtained movie. Kalliroscope flakes are platelet and can make shear flow visible. Wavy vortex flow mode (WVF) in which an azimuthal wave mode superposes Taylor vortex flow mode (TVF) was investigated. Wave number and phase velocity of the azimuthal wave appearing in WVF at higher Reynolds number were determined by image analysis. Azimuthal flow structure of modulated wavy vortex flow mode (MWVF) was clearly visualized and the modulation component of MWVF was investigated by Fourier analysis of a temporal variation of brightness distribution extracted from a movie of visualized flow. Continuous wavelet analysis indicates that the modulation might occur for all wave regions but with different characteristics.

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