E133 垂直壁面を流下する高粘性の流体におけるソリトンの衝突実験(E-13 遷移と不安定性(3),一般講演)

概要

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It is not sensible to apply the energy balance analysis to the stability problem of falling film flows. The reason is that the neutrally stable cases occur only for very large viscosity, where dissipation is so large that energy balance gives no insight into the instability mechanism. Furthermore, a soliton-like behavior is predicted in the high-viscosity limit, which seems quite paradoxical from the viewpoint of the energy balance. In order to verify this theoretical prediction, we perform a series of experiments to observe an elastic collision between solitary waves on a vertical falling film flow with very large viscosity. As a solid boundary, both a plain wall and a circular string are tested. The collision is more elastic in the latter case, apparently due to the absence of the side walls.
日本流体力学会の論文
2004-08-09