Multifluid-Model for Turbulent Gas-and Liquid Film Flow.

A multifluid-model is introduced for the momentum transport of a downwards directed turbulent two-phase-flow consisting of a gaseous core and a liquid film (core-film-flow) with wavy interface. The flow field is subdivided into a basic film region, a wavy region and the gaseous core. The phase distribution is represented by the incomplete Gamma-function, and the friction between the phases is given by a friction factor depending on a dimensionless pressure gradient. From the solution of the governing equations, the pressure drop of the core-film is obtained as a function of the liquid - and the core-Reynolds-number. The calculated pressure drop is in good agreement with that obtained from empirical correlations.