ANALYSIS OF ENTRAINMENT AND DEPOSITION MODELS IN ANNULAR DISPERSED FLOW REGIME

A comparative analysis of entrainment and deposition models was carried out using a steady-state one-dimensional three-fluid model with equal pressure in the phases. The predictive ability of the models that take into account both purely hydrodynamic entrainment of droplets and bubble entrainment associated with film boiling in heated channels is analyzed. The calculated hydraulic characteristics of two-phase steam-water flow are compared with known literature data: in the pressure range of 0,98–11,77 MPa, mixture flow rates of 500–3000 kg /(m2s), and vapor quality of 0,08–0,95 for vertical adiabatic channels and in the pressure range of 2,94–10 MPa, mixture flow rates of 500–3000 kg/(m2s) and vapor quality of 0,2–0,65 for vertical heated channels. The results of the analysis helped find the models that predict the literature data in the best way.