Abstract
An analysis of annular-dispersed flow is presented in which the flow is modelled as a two-dimensional film and a one-dimensional, droplet laden gas core. The focus of the analysis is droplet interchange between core and film and its associated momentum transfer. The intensity of droplet deposition and entrainment governs the axial velocity of each drop size and allows calculation of a maximum stable drop diameter, in good agreement with Wicks' measurements. An exponential radial void distribution together with a modified universal velocity profile through the film allow calculation of mean and film crest thicknesses from a given film flow rate. These agree well with Harwell data as does the calculated film crest velocity. Interfacial friction factors due solely to profile drag are also calculated and found to agree approximately with Wallis' values for flows with negligible entrainment.
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