Numerical methods for compressible multiphase flow with sodium-water chemical reaction

Uchibori, Akihiro ; Ohshima, Hiroyuki

In order to establish a safety evaluation method of a steam generator of sodium-cooled fast reactors, a computer program called SERAPHIM calculating compressible multicomponent multiphase flow with sodium-water chemical reaction under tube failure accident has been developed. In this study, applicability of the numerical models for the compressible multiphase flow, chemical reaction and liquid droplet entrainment from an interface of the gaseous jet and its transport was investigated through the analyses of the related experiments. In the analysis of vertical discharging of water vapor in the liquid sodium pool under the actual condition of the steam generator, numerical result reproduced appearance of the underexpanded vapor jet. The calculated peak temperature agreed with the experimental results well. Also, appearance of the dispersed phase of droplets in the reacting jet and its acceleration by the supersonic gaseous flow were represented successfully.