Assessment of stratification and entrainment models in CATHARE 3 code during FONESYS activities
Résumé
This paper presents the assessment of CATHARE 3 code against tests performed in the horizontal TPTF (Two
Phase Tests Facility) and Mantilla facilities. This activity falls within the framework of a benchmark conducted
by the Forum & Network of System Thermal-Hydraulics Codes in Nuclear Reactor Thermal-Hydraulics (FONESYS).
The aim of this benchmark is to highlight the capabilities of system thermal–hydraulic codes to predict the
horizontal stratification criteria and the onset of droplet entrainment and entrainment rate. One of the objectives
of horizontal TPTF (TPTF-H) experiments, conducted by JAERI (Japan), was to analyse the thermal–hydraulic
responses in the horizontal legs of Light Water Reactors. The considered tests were at steady state and saturated
steam/water two-phase flow conditions for a pressure varying between 3 MPa and 12 MPa. CATHARE code
simulations show a general rather good agreement with TPTF-H experimental results although some improvements
like the stratification regime prediction seem necessary. In two horizontal test sections with different
diameters, Mantilla carried out air/water experiments at low pressure, from stratified to annular flow conditions,
including droplet entrainment. Entrainment fraction obtained both with the two-fluid 6-equation model and the
3-field model of CATHARE are compared against the experimental data. Some improvements of the existing
models are proposed for the entrainment and deposition processes to better fit the experiments.
Domaines
Sciences de l'ingénieur [physics]Origine | Publication financée par une institution |
---|---|
Licence |