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• W3130052217 abstract "• The experiments of vertical co-current air-water two-phase flow in an up-scaled tight lattice bundle were carried out. • A 16 × 32 wire-mesh sensor was used to measure void fraction distribution evolution along the channel. • The accuracy of six drift-flux models has been evaluated with the experimental data. Tight lattice fuel assemblies have significant advantages in power density and conversion ratios. However, the dynamic characteristics of two-phase flow in tight lattice bundles, which is very important to safety analysis, are still not clarified. This study presents an experimental investigation of two-phase flow evolution in a double sub-channels tight lattice bundle. The experimental channel was up-scaled (1:2.7) compared with the prototype fuel. Phase distributions at four different axial positions, z / D h = 28.95, 57.90, 86.86, and 115.8, are measured with a high spatiotemporal resolution by a 16 × 32 wire-mesh sensor. The flow regime includes bubbly flow, cap-bubbly flow, and slug flow. In the bubbly flow, the large-scale pulsations across the gap of two sub-channels were observed, as same as the single-phase flow in a tight lattice bundle. The time-averaged void fraction shows a gap region peak in bubbly flow. In the cap-bubbly flow, the cap bubbles are confined to a single sub-channel due to the small gap. The cap bubbles are alternated arrangements in the two sub-channels and the large-scale pulsations across the gap are caused due to this special flow configuration. The time-averaged void fraction shows a core peak profile in a cap-bubbly flow. In the slug flow, the slug bubbles can across the small gap to span the two sub-channels and the time-averaged void fraction shows a core peak profile. Even though the time-averaged void fraction almost coincides at different axial positions, the phase interface structure shows a significantly different according to the virtual side view of void fraction. The accuracy of the drift-flux models has been evaluated with the experimental data. The Bestion's model underestimated the void fraction in the channel while the Chexal's model overestimated it. Clark's model gets the best prediction with an error of 10.1%." @default.
• W3130052217 created "2021-03-01" @default.
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• W3130052217 date "2021-06-01" @default.
• W3130052217 modified "2023-10-03" @default.
• W3130052217 title "Experimental investigation of two-phase flow evolution in a tight lattice bundle using wire-mesh sensor" @default.
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• W3130052217 doi "https://doi.org/10.1016/j.ijheatmasstransfer.2021.121079" @default.
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