Abstract: The liquid film DRYOUT is widely accepted as the mechanism of CHF in annular flow regime. Lacking assessment by experimental data points, it’s doubtful whether the existing DRYOUT models can be used in narrow rectangular channels or not. Several groups of correlations for entrainment and deposition rates were investigated and compared in this paper. Based on the comparison results, an optimized model was constructed. Compared with the existing models, the model in this paper has better accuracy. It’s suitable for the prediction of CHF in narrow rectangular channels.