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Report No.
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Quantitative evaluation of gas entrainment by numerical simulation with accurate physics model

Ito, Kei; Koizumi, Yasuo*; Ohshima, Hiroyuki; Kawamura, Takumi*

In the design study on a large-scale sodium-cooled fast reactor, the reactor vessel is compactified. However, such a reactor vessel induces higher coolant flows in the vessel and causes several thermal-hydraulics issues, e.g. gas entrainment (GE) phenomenon. To clarify the negative influences of the GE on the JSFR, not only the onset condition of the GE but also the entrained gas (bubble) flow rate has to be evaluated. In this study, the authors performs numerical simulations to investigate the entrained gas amount in a hollow vortex experiment. To simulate interfacial deformations accurately, a high-precision numerical simulation algorithm for gas-liquid two-phase flows is employed. As a result, the numerical simulation gives somewhat larger entrained gas flow rate than the experiment. However, both the numerical simulation and experiment show the entrained gas flow rates which are proportional to the outlet water velocity.

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