Abstract
A thin water film flowing down an inclined plane was investigated with regard to the breakdown and formation of liquid film. The contact angle at the stagnation point of the dry patch was measured by laser beam refraction. The film thickness and wave properties, such as velocity, height and frequency were also measured. On the basis of the experimental results, the balance of force acting on a dry patch was examined for the two layer model, which consists of a base film and wave layers. A dry patch vanishes when the dynamic pressure force mainly due to a disturbance wave is superior to the surface tension force. It is concluded that the main factor to rewet is the spreading of a disturbance wave.
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