薄い粘性層による鉛直加振下の液体層の波動の防止

概要

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Instabilities of a liquid layer, over which a thin viscous liquid layer is superposed, are investigated theoretically and experimentally under vertical periodic motion. It is assumed that the depth of the lower layer is finite and that of the upper one is very small. Thus, the motion of the lower and upper liquids are treated as an irrotational flow and a viscous flow, respectively. The neutral curves, which separate the stable region from the unstable one in the plane of the frequency and the amplitude of an externally imposed acceleration, are found by using a linear theory. The neutral curves depend on the Reynolds number, the depth ratio, the density ratio, the Weber number and the ratio of the surface tension coefficient. The motion of the ideal fluid layer is found to be stabilized by superposing a thin viscous liquid layer. The theoretical results are fully confirmed by those experimentally undertaken in the water-oil liquid layer.
一般社団法人日本機械学会の論文
1986-01-25