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- W3168716264 abstract "In the framework of pressurized water reactors life duration safety studies, an important issue is to evaluate the vessel mechanical behavior during a postulated loss of coolant accident, when cold water coming from the emergency system flows through the cold leg towards the downcomer: this is the Pressurized Thermal Shock (PTS). Some studies addressed the problem from the two-phase CFD angle, with some shortcomings recently synthesized in the NURESIM European project. As a first step towards an answer to them, the paper presents a new model implemented in the NEPTUNE-CFD code. The direct contact condensation key model, the liquid-to-interface heat transfer, is formulated using a wall function-like approach, with three layers: diffusive, logarithmic and out of the dynamically surface-influenced region. In order to deal with the experimental observation of the sudden increase of condensation from smooth to wavy regimes and to explain some past validation results, an hypothetical interpretation is proposed based on the Brocchini and Peregrine L-q diagram which consists in assuming a predominant role of the liquid turbulence on the free surface behavior. Consequently the model switches between smooth surface regime of weak turbulence and wavy surface regime of strong turbulence. The model is validated on the Lim et al. (1984) experiment, a steam-water stratified turbulent flow with free surface flow conditions going from smooth to wavy. (author)" @default.
- W3168716264 created "2021-06-22" @default.
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- W3168716264 date "2009-07-01" @default.
- W3168716264 modified "2023-10-17" @default.
- W3168716264 title "A wall function-like approach for two-phase CFD condensation modeling of the pressurized thermal shock" @default.
- W3168716264 hasPublicationYear "2009" @default.
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