Measurement of some basic parameters in two‐phase annular flow

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Abstract
The vertical upflow of air‐water mixtures in the dispersed‐annular flow regime has been studied in a ¼ × 3‐in. rectangular channel. Dye injection into the wall film was used to determine film and gas core properties along with the rate of droplet interchange between the core and the film. Visual observations demonstrated that the most important characteristic of this flow regime is the surface waves generated by the gas flow over the liquid film. Despite the surface waves, these data indicate that the liquid film approximately follows the generalized u+ — y+ relationship for turbulent pipe flow. The droplet motion is discussed in terms of transverse diffusion and momentum transfer.

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