Study on sodium-water reaction phenomena in steam generator of sodium-cooled fast reactor, 13; Visualization experiment of gas jet

Nago, Kohei*; Koizumi, Yasuo*; Uchibori, Akihiro ; Ohshima, Hiroyuki

Under a tube failure accident in a steam generator of sodium-cooled fast reactors, a reacting jet may cause wastage on the adjacent tube due to liquid droplet impingement erosion. In this study, the visualization experiment on an air jet into a water pool was conducted to clarify a phenomenon about liquid droplet entrainment from a gas-liquid interface, which is a cause of liquid droplet impingement erosion. The high-pressure air was injected into the water pool in the rectangular vessel made with acrylic plates. The behavior of the air jet was observed by the high-speed camera. It was demonstrated that the droplet diameter decreased with increasing the inlet velocity of the air and the droplet incidence rate increased with increasing the inlet velocity.