Development and validation of a two-fluid three-field model for the vertical upward flow

The performance of the droplets is vital of importance to the annular-mist flow and the heat transfer for the reflooding conditions. In this research, a two-fluid three-field model for the vertical upward flow is developed. The field equations of the vapor, continuous liquid phase and dispersed liquid droplet phase are established. The set of equations are solved by the semi-implicit difference algorithm based on the staggered grids. Wrutz's steamwater entrainment experiment is simulated to evaluate the performance of the selected closure relations. Becker's and Bennett's dryout and post-dryout heat transfer experiments are simulated to validated the interfacial and wall heat transfer models. Finally, the tubular reflooding experiments are simulated to study the effect of the droplets on the wall heat transfer for different injection conditions. The predicted results are compared to the experimental data and the predicted results by the additional two-fluid model. The results show that the predicted results by this two-fluid three-field model are more accurate than those by the additional two-fluid model.

Automated summary

A two-fluid three-field model for vertical upward flow was developed in this research to study the performance of droplets in annular-mist flow and heat transfer under reflooding conditions. The model was evaluated and validated through simulations of various experiments, showing that it provides more accurate results compared to an additional two-fluid model.