| Budget Amount *help |
¥4,810,000 (Direct Cost: ¥3,700,000、Indirect Cost: ¥1,110,000)
Fiscal Year 2019: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2018: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2017: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
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| Outline of Final Research Achievements |
This study has constructed a 6×6 rod bundle flow channel equipped with a gas phase introduction device capable of locally controlling the gas inlet boundary condition to simulate a fuel assembly. The complicated gas-liquid two-phase flows are generated by controlling the gas inlet boundary conditions, and their local parameters of void fraction, interfacial area concentration, bubble diameter and interfacial velocity are measured using the double- and four-sensor probes. A database reflecting the gas phase diffusion in the two-phase flow has been accordingly established for the rod bundle. Furthermore, the existing drift-flux models and bubble coalescence and breakup models for the interfacial area transport equation have been evaluated with the experimental data. After having elucidated the gas phase diffusion and interfacial area transport mechanisms of gas-liquid two-phase flow, new drift-flux model and bubble coalescence and breakup model have been developed and verified finally.
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