Liquid film formation on the inner surface of the horizontal channel

In a horizontal channel a separated flow usually occurs if the size of the channel is not as small as a capillary tube and the flow rates of both phases of gas and liquid are low. If the flow rate of gas exceeds a certain value, liquid begins to climb up the inner surface of the channel. The higher the gas velocity, the higher the film climbs up toward the top of the channel cross section. The present paper is concerned with the experimental investigation of the role of large scale waves, or disturbance waves, in the formation of liquid film on the side wall of a horizontal channel. The thinning process of liquid film thickness as the function of time is also investigated by a simple liquid flow model. (orig.)