Improvement of the subcooled boiling model for low-pressure conditions in thermal-hydraulic codes

摘要

The functioning of the subcooled boiling model adopted in a thermal-hydraulic computer program has been investigated in detail, for low-pressure conditions, and necessary refinements have been incorporated into the code. The investigation has been carried out in two stages; in the first stage, the performance of the interfacial heat Transfer/condensation is studied. Necessary refinements to the vertical flow map for the transition from bubbly to slug Flow regimes and the interpolation with the 'umbrella' limitation that bounded the interfacial heat transfer values are Carried out.