E142 液膜流れで現れるWave Packetの観察と線形安定性理論によるシミュレーション(E-14 遷移と不安定性(4),一般講演)

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This paper describes the behavior of a wave packet produced in the laminar region of a radial liquid film flow. The liquid film flow was formed by a water discharge to the atmosphere from a thin cylindrical gap between a pipe end and a disk surface. The wave packet was produced by a pulse-like jet injection into the laminar flow through a small hole in the disk, and was observed by high speed photography. The development of wave packet was also simulated using the linear model proposed by M. Gaster and was compared with that of the experiment. It was found that the overall shapes of the disturbed region and the way it spread out as the packet traveled downstream were well predicted by the linear model. It was also found that the group velocity of the wave packet is 1.4 times as large as the phase velocity of the ordinary disturbance wave.
日本流体力学会の論文
2004-08-09