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A dynamic neutron radiography(DNR) has a complementary characteristics to X-ray radiography and is suitable for a visualization and measurement of a multi-phase flow research in a metallic duct and a liquid metal flow. Two kinds of experiments were conducted to visualize the water-air two-phase flow and the liquid-metal two-phase flow. The void fraction and the two-phase flow patterns in a channel simulating the HANARO fuel channel were investigated in the D₂O-air two-phase condition. The DNR technique was also applied to visualize the flow field in the gas-liquid metal two-phase flow with the HANARO-beam facility. The two-phase flow images were taken at various combinations of the liquid flow and gas flow with a high frame-rate neutron radiography at 1000 fps. The study showed that the dynamic neutron radiography is a good technique to measure the two-phase flow behavior in the complex rod-bundle geometry and the liquid-metal two-phase flow.

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Abstract
1. Introduction
2. Test for HANARO channel
3. Test for Liquid-Metal Two-phase Flow
4. CONCLUSIONS
ACKNOWLEDGMENTS
References

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UCI(KEPA) : I410-ECN-0101-2009-550-016798614