The aim of the present study is to review and compare between the methodologies used for modeling condensation with non-condensable, in a two-phase flows channel. The important state-of-the art numerical algorithms for the solution of multi-phase conservation equations are reviewed. The methodology for modeling condensation in these algorithms is based on the stagnant film theory. The methodology used in RELAP5/MOD3 was the most accurate model because it rigorously treats the coupling between the heat and mass transfer processes, and the gas-liquid interphase without iteration.