Assessment of the CATHARE code over SUPERCLAUDIA tests for a jet in a liquid water pool
Résumé
Steam injection into a sub-cooled pool is an attractive phenomenon due to its high thermal transfer capacity and since many years, it is an important subject of studies. Several applications exist for both industrial and nuclear heat removal systems, such as suppression pools and depressurization systems. In this context, accurate prediction of the mass and energy liquid-gas exchanges such as in the Direct Contact Condensation (DCC) is a significant research effort in nuclear thermal hydraulics. The understanding of these transfers is therefore critical in order to predict system behavior, particularly under accidental conditions. Several experiments have been carried out over the years to investigate the physics and characteristics of direct condensation phenomenon and the steam water exchanges; specifically, the results of SUPERCLAUDIA experiment are presented in this work. The investigation of the involved physics and the validation of the employed CATHARE system code are presented hereafter. The direct condensation of the vapor jet in the liquid pool, the heat exchange at the free surface or the bubble vapor rise dynamics are so investigated. A comparison of simulated and calculated results reveals some differences. The challenge for codes is modelling the corresponding multiscale physics. This paper discusses the significant modelling effort required to improve the CATHARE code, as well as the need to understand the relationship between smalland large-scale phenomena. The use of a CFD code is planned to complete the system scale modelling.
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