Liquid Films Flowing Concurrently with Air in Horizontal Duct : 2nd Report, Characteristics of Two-Dimensional Wave and Disturbance Wave Regions

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An isothermal thin water film, flowing concurrently with an air stream in a horizontal duct was investigated. This paper gives experimental results on the celerity, length and frequency of waves besides the characteristics of film thickness such as mean, maximum, minimum and height of them in two-dimensional wave and disturbance wave regions. These quantities are discussed in connection with the flow mechanism in these two regimes. As the result it is made clear that the two-dimensional wave region is divided into two regimes ; in the first regime the thickness is relatively large and surface tension is one of the main factors to control the celerity. In the other regime which is adjacent to the non wetting region, the mean film thickness is very small and the celerity is controlled mainly by the dynamic pressure of the air flow. Furthermore, the flow mechanism of base film in disturbance wave region is similar to that in pebble wave region of same water flow rate.
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