Droplet entrainment and deposition rates in a horizontal annular flow for SPACE code

Correlations for the droplet entrainment and deposition rates were developed to accurately predict its behavior in a horizontal annular flow. The Lopez de Bertodano et al. droplet entrainment rate correlation was evaluated and then modified based on the experimental data for both vertical and horizontal annular flows. In addition to this, a new droplet deposition coefficient correlation was proposed for a droplet deposition rate. The droplet deposition coefficient is represented by a function of dimensionless parameters considering the effects of the gas and liquid superficial velocities and the pipe inner diameter. Finally, the SPACE code was assessed against various experimental data for droplet mass flow rate of horizontal annular flows obtained from the open literature. The improved SPACE code showed better prediction capability for the droplet behavior in the horizontal annular flow than the original one.