Abstract
The generation of a disturbance wave on a liquid film flowing concurrently with a gas in a horizontal rectangular duct is analyzed theoretically based on the instability of both the dynamic and kinematic waves. The result shows that the occurrence of a disturbance wave strongly depends on a film thickness. The film thickness obtained theoretically by assuming both the liquid film and the gas flows being laminar is larger than the experimental value. Therefore, the experimental data on film thickness are used to predict the flow condition of transition from pebble wave to disturbance wave. A simple correlation for the P-D boundary is obtained which includes the effect of the duct height. Finally, the role of a disturbance wave in liquid film formation is also discussed.
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