[en] A two-dimensional two-fluid model is developed to predict the liquid and vopour parameters as well as the surface temperature of a heated tube. Aphysical model with two regions represents inverted-annular film boiling (IAFB) based on author's visual observations. The analytical model is consisted of a set of differential conservation equations together with appropriate closure correlations and solved numerically. Successful comparisons are made between model predictions and Stewart's experimental data. Generally, the model predicts correctly the dependence of wall temperature on liquid subcooling, mass flow rate, pressure and heat flux input. The two dimensional effectness isn't very significant. The initial vapour film thickness doesn't influence the wall temperature predictions very much