A state-of-art report on condensation modelling with noncondensable gas

This report presents recent developments in the modeling of the condensation with noncondensable gas. There are three methods for studying the condensation heat transfer with noncondensable gas. First, the method using experimental data second, the method using boundary layer theory and third, heat and mass transfer analogy method. In particular heat and mass transfer method is used in analysis of turbulent mixture boundary layer. The CATHARE2 and RELAP5/MOD3 thermal hydraulic codes were used to study the ability of the codes to predict condensation phenomenon. In the standard version of the CATHARE2 code, the Shah correlation predicts too low heat transfer coefficient. Therefore the calculation using the Chen correlation and heat and mass analogy yields a better agreement with experimental data of Isolation Condenser. In RELAP/MOD3 case, the original formulation is based on the reduction factor approach. It overpredicts the heat transfer coefficients. As CATHARE2, the calculation using Chen correlation and heat and mass transfer method was much better agreement with the experimental values. The results of the tested models in predicting some limited data are satisfactory, but further studies and more experimental data are needed. 3 tabs., 23 figs., 49 refs. (Author)