2000 年 20 巻 1Supplement 号 p. 369-372
Multi-dimensional interface structure in air-water two-phase flow was visualized by using a fast X-ray CT scanner, which is able to scan a cross section approximately 100 times faster than conventional systems. To simulate flow channels in heat exchangers, locations and pitches of 3 rods were varied in a vertical tube. Gas-phase distribution in the cross section was reconstructed for analysis of the void fraction and the interface area concentration. The same facility was then used to visualize the water jet interface while penetrating through a Fluorinart pool. Due to relatively large density difference between the two immiscible fluids (1.7), the deformed interface structure was successfully detected. For visualization of overall jet interface, the jet nozzle was lifted upward at a constant velocity while scanning the cross section. In both two-phase flow and water jet interface visualizations, quantitative measurements of the phase distribution and the interface area concentration were made from reconstructed cross section images.