Abstract
A model has been developed for the prediction of flow regime transitions, liquid holdup and pressure gradient for horizontal and low-inclination upward two-phase gas-liquid flow in annuli. The model is based on the hydrodynamic behaviour of slug flow and closure relationships developed for full pipe flow, which are adapted to account for the annulus diameter ratio and eccentricity. This includes the improvement of the model for the prediction of the single-phase friction factor in annuli. Model predictions are compared with the experimental data presented in Ibarra et al. (2019) and the model shows good agreement for gas-water and gas-oil flow in both concentric and fully eccentric annuli.
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