Development of validation technology for detailed two-phase flow simulation codes to optimize innovative reactor design, 8; Development of fluorescence laser doppler velocimeter for gas-liquid two-phase flow measurements

Fukuzato, Katsuhiko*; Nakamura, Kenichi*; Ono, Ayako ; Yoshida, Hiroyuki  ; Okamoto, Kaoru*; Moriguchi, Daisuke*; Hosokawa, Shigeo*

To accelerate the early commercialization of advanced reactors, the use of detailed two-phase flow numerical simulation as an alternative or complement to large-scale mock-up tests is being considered. In this study, we are developing a measurement technique capable of simultaneously obtaining local void fraction and liquid velocity to validate the accuracy of detailed two-phase flow simulation. We developed a fluorescence laser Doppler velocimeter (LDV) that enables simultaneous detection of excitation light and fluorescence wavelengths from tracer particles. By exploiting the difference between scattered excitation light from gas bubbles and fluorescence emission from liquid-phase tracers, the fluorescence LDV successfully separates the Doppler signals of each phase.