Study on Two-Phase Flow in Small Metal Pipe Tube using Proton Radiography

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High sensitive and high resolution real-time proton radiography system has been developed.When an opaque fluid is used as a working fluid and the test section is made of metal, optical method cannot be used for the visualization of the boiling bubbles. It has been difficult to visualize with X-ray or neutron beams because of the high speed events such as behaviors of boiling bubbles. In these case, it may be expected that proton radiography is useful. Because proton radiography depends on the rapid change of ionizing power of proton with distance near the end of their range and is used with a high flux of proton beams. In this study, the visualization of the dynamic events such as boiling bubbles in a small metal pipe was investigated by using proton radiography.The monochromatic proton beam of 14 Mev was used. Test section were irradiated with proton beam flux of about 10^<11> particles/cm^2.s for 0.94, 1.54 and 1.94mm in diameter, and then proton radiography of boiling bubbles were taken on the fluorescent screen near by the test section. Images of bubbles recorded with the high speed video camera (maximum 4000 frames per second).