Validation of a bottom flooding model

To validate a thermal-hydraulic model, which predicts the wall temperature history and the quench front propagation during the bottom reflooding of tubular channels, a comparison is made between the predicted results and the experimental data performed on a facility with a 2 m long, 0.01 m inner diameter and a 0.001 m thick AISI 304 vertical tubular test section. The initial wall temperature ranges from 600 to 7000C, the flooding mass velocity ranges from 127 to 254 Kg/m/sup 2/s, the inlet water temperature ranges from 20 to 800C, the pressure is 0.1 Mpa. New void fraction, vapour enthalpy, critical Weber number and heat flux correlations in the inverted annular flow region are presented