[2E09-14] Fast Reactor Thermal Hydraulics

[2E10] Effect of Pressure Gradient along Axial Direction of Vortex-Core on Gas Entrainment Flow Rate

*Tomoaki Torikawa¹, Naoya Odaira¹, Daisuke Ito¹, Kei Ito¹, Yasushi Saito¹, Kentaro Matsushita², Toshiki Ezure², Masaaki Tanaka² (1. KYOTO Univ., 2. JAEA)

Keywords:Sodium-cooled fast reactor, Free-surface vortex, Gas entrainment, Pressure gradient, Gas core

On the gas liquid interface in a sodium-cooled fast reactor, gas entrainment can be caused by free surface vortices, which may result in, a disturbance in core power. Therefore, it is important to predict accurately the entrained gas flow rate for the fast reactor design. In this study, gas entrainment experiments are conducted to acquire the entrained gas flow rate under several flow conditions. Especially, the effect of pressure gradient along the axial direction of the vortex-core direction is investigated in detail. In addition, the two-phase flow in the suction pipe is visualized to investigate the interfacial drag behavior by using optical/x-ray imaging.