Liquid sodium flow dynamics studies using nonlinear wavelength conversion VUV laser, 2; Gas entrainment at free surface and application to sodium flow

Kamide, Hideki ; Kimura, Nobuyuki; Ezure, Toshiki ; Uchibori, Akihiro ; Hayashi, Kenji; Fukuda, Takeshi*; Takata, Takashi*

Gas entrainment at free surface in a reactor vessel is one of the significant issues in a design of a compact sodium cooled fast reactor. VUV laser is planned to apply visualization of liquid-gas surface shape during the gas entrainment in a sodium test. The sodium experiments were carried out for the onset criteria of the gas entrainment due to a free surface vortex. Water experiment using the same geometry with that in the sodium test was also performed. Onset condition maps in the sodium and water tests were in good agreement.