Two-Phase Flow Simulations for PTS Investigation by Means of Neptune CFD CodeReport as inadecuate




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Science and Technology of Nuclear InstallationsVolume 2009 2009, Article ID 950536, 12 pages

Research Article

Department of Mechanical, Nuclear, and Production Engineering DIMNP, University of Pisa, Via Diotisalvi n. 2, 56126 Pisa, Italy

DEN-DER-SSTH-LMDL, CEA-Grenoble, 17 Rue des Martyrs, 38054 Grenoble Cedex 9, France

Received 31 January 2008; Revised 3 June 2008; Accepted 18 August 2008

Academic Editor: Dirk Lucas

Copyright © 2009 Maria Cristina Galassi et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Two-dimensional axisymmetric simulations of pressurized thermal shock PTS phenomena through Neptune CFD module are presented aiming at two-phase models validation against experimental data. Because of PTS complexity, only some thermal-hydraulic aspects were considered. Two different flow configurations were studied, occurring when emergency core cooling ECC water is injected in an uncovered cold leg of a pressurized water reactor PWR—a plunging water jet entering a free surface, and a stratified steam-water flow. Some standard and new implemented models were tested: modified turbulent - models with turbulence production induced by interfacial friction, models for the drag coefficient, and interfacial heat transfer models. Quite good agreement with experimental data was achieved with best performing models for both test cases, even if a further improvement in phase change modelling would be suitable for nuclear technology applications.





Author: Maria Cristina Galassi, Pierre Coste, Christophe Morel, and Fabio Moretti

Source: https://www.hindawi.com/



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