Correlation of Heat Transfer Coefficient for Saturated Film Boiling during Reflood Phase Prior to Quenching

A correlation of a heat transfer coefficient was derived for the transition flow region between the quench front and the dispersed flow region during the reflood phase. The correlation was compared with data from a small scale reflood experiment with a 4×4 heater-rod bundle and FLECHT experiments and showed fairly good agreement with the experimental data. The predicted errors were nearly within ±30% for all the data of the referred small scale reflood experiment, ±20% for all data except for the data of high flooding rate cases (higher than 7.5×l0 −2 m/s) and the data measured at the location just below the spacer grid, and ±20% for two selected FLECHT tests.