NEUTRON RADIOGRAPHY FLOW VISUALIZATION OF LIQUID METAL INJECTED INTO AN EMPTY VESSEL AND A VESSEL CONTAINING SATURATED WATER

摘要

Neutron radiography was used to observe the behav- ior of molten lead-bismuth alloy injected into a thin (10- mm) semicircular vessel, which was empty or contained saturated water. The fluid velocity distribution for the melt injected into the empty vessel was successfully mea- sured using particle image velocimetry (PIV). The nu- merical analysis for this case using the FLOW-3D code revealed that the wall heat transfer attenuates the rota- tional speed of swirls that were formed during the melt injection.