Waves in a viscous liquid curtain

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Abstract
The wave motion created by a small obstacle placed in a viscous liquid curtain which falls steadily between two vertical guide wires is studied experimentally. The disturbances introduced by the obstacle propagate in the curtain to form two distinctive stationary lines of constant phase; one corresponds to the sinuous mode and the other to the varicose mode. The observed wave motion compares very well with that predicted by the theory of Lin (1980). The observed angle between the tangent at any point on the line of constant phase and the vertical are used to infer the dynamic surface tension of a rapidly moving surface. A considerable difference between the dynamic surface tension and the usual static surface tension is found for a liquid solution. However, no measurable difference is found for a pure liquid at the flow rates used in our experiments.

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