Abstract
Abstract This study concerns falling water films on a vertical cylinder of 45 mm diameter with a downward step in the region where the film flow is not developed and has very weak waves. Varying the step height H from 1.5 to 5.0 mm and the film Reynolds number Re from 50 to 2000, film flows were observed and film thicknesses were measured by the needle contact method near the step. The effects of the steps on water films were compared with each other and discussed. The streamline shapes of free water films formed under the step were theoretically obtained when the ring-shaped air layer was observed. The results agree well with the experimental curves obtained from the photographs.
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