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A detailed analysis of liquid film evaporation and condensation has become increasingly important, especially in water reactor designs.For example, the prediction of liquid film evaporation is critical to the design of Passive Containment Cooling Systems (PCCS), which are important passive safety facilities in modern Pressurized Water Reactors (PWR).To keep the maximum design values of pressure and temperature under control, a water/air counter-current flow is often employed within the external channel of the PCCS.It is thus essential to analyse the evaporation mass flow rate and heat transfer of the water film for the overall performance of PCCS.On the other hand, hydrogen might be released into the reactor containment during an incident due to cladding oxidation at elevated temperatures.Given the high flammability of gaseous hydrogen, it is paramount to know its local distribution in the containment building while considering wall condensation, which will increase the non-condensable gas concentration on the walls.Another example is evaluating the containment loads in the Light Water Reactor (LWR) plants and predicting their condensation behaviour in the presence of non-condensable gases.With the advantages of Computational Fluid Dynamics (CFD) and recent model developments, the numerical analysis of evaporation and condensation of liquid films has become more convenient than expensive experiments for real-world applications.In this paper, the numerical model of Eulerian Wall Film (EWF) implemented within Ansys Fluent® has been validated based on two canonical cases.The first one refers to the experiments performed by Hu et al. 1, where the heat transfer during the water film evaporation on a vertical plate has been studied.The average heat flux and water film evaporative ratio match the available experimental data well.The second case relates to the experiments done by Ambrosini et al. 2, also known as the "CONAN" case, where the wall film condensation in the presence of non-condensable substances has been studied under different steam mass fraction and velocity conditions.The surface heat flux and condensate mass flow rate also match the experimental measurements.The present numerical workflow using EWF could be applied to more complex devices for liquid film evaporation and condensation simulations.
Xia et al. (Mon,) studied this question.