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Bubble behavior in liquid-gas two-phase flow behind a cross-shaped obstacle in a vertical circular duct

Takase K., Kawasaki G., Ueta K.

Abstract: Grid spacers installed in subchannels of fuel assemblies for nuclear reactors can promote heat transfer. However, the fluid velocity and bubble behavior are greatly affected as the cross-sectional area of the flow passage changes. Therefore, the void fraction distribution behind the obstacle that simulates the grid spacer shape simply was measured by using a wire mesh sensor (WMS) system. Moreover, a two-phase flow analysis was performed to investigate the effect of the obstacle on the bubble behavior in a vertical duct.
Keywords: two phase flow / bubble behavior / spacers / duct

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