One-dimensional model of wet gas flow in near-horizontal pipes

A one-dimensional model able to predict the film distribution around the pipe wall under conditions typical of wet gas flow in near-horizontal pipes is presented. The model is based on the assumption that i) liquid droplets can only be entrained by die gas from the thick liquid layer flowing at pipe bottom and ii) the deposition of smaller droplets is related to an eddy diffusivity mechanism, while larger droplets deposit by gravitational settling mainly on the pipe bottom. The presence of a thin liquid film all around the pipe wall significantly affects the pressure gradient along the pipe. The present model is a new component of MAST (Multiphase flow Analysis and Simulation of Transitions), a transient. 1-D flow simulator developed for advanced flow assurance studies.