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In the steam generator of the fast breeder prototype reactor “Monju”, heat exchange tubes of helical coil type are utilized. Steam-water two-phase flows in the helical coil tube have unique characteristic due to effects of centrifugal acceleration. In this report, we visualized gas-liquid two-phase flows in the helical coil tube for providing the flow pattern map, and suggested the method for reconstructing the interfacial structures of gas-liquid two-phase flows in the cross-section of the tube. The method was applied to artificial images and experimental images, and the applicability was discussed.

Visualization and Image Processing for Gas-Liquid Two-Phase Flow in a Helical Coil Tube