Confirmation of applicability of gas entrainment evaluation model considering pressure distribution along vortex center line for water experiment in rectangular flow channel involving advective vortices

Matsushita, Kentaro ; Ezure, Toshiki ; Imai, Yasutomo*; Fujisaki, Tatsuya*; Tanaka, Masaaki  

In the sodium-cooled fast reactors, evaluation of cover gas entrainment (GE) by dip vortices at the free surface in the upper plenum of reactor vessel is important. In this study, GE evaluation model, including the identification of vortex center lines between free surface and suction port from the flow velocity distribution obtained by three-dimensional analysis, the calculation of pressure decrease distribution along vortex center line, and the comparison of pressure decrease and the hydrostatic pressure, was investigated. The analyses for GE experiments in a rectangular flow channel were performed by changing the inlet flow velocity condition, and this evaluation model was applied to the flow velocity distribution obtained from the analysis results. As a result, it was confirmed that the phenomenon in which the occurrence of GE increased as the inlet flow velocity increased was reproduced as in the experimental results.