1535 鉛直加振によるメニスカスの変形によって励起される容器内界面波(G05-3 複雑流体,G05 流体工学)

概要

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The horizontal length of meniscus is characterized by capillary length which depends on the magnitude of the vertical acceleration. Hence, vertical oscillation of meniscus induces cyclic deformation of it, and thus resulting in excitation of interface waves. In this study, the interface wave induced by such a cyclic deformation of the meniscus under vertical periodic oscillation was investigated numerically and experimentally. Interface between stratified fluids of water and silicon oil in a circular cylinder was oscillated vertically with various static contact angles. The peak height and the natural frequency of the excited wave depend on the difference of the static contact angle from 90 degrees. It is shown that the peak height is proportion to tan(θ-π/2) with θ the static contact angle.
2007-09-07