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- W4310346509 abstract "The tight lattice rod bundle assembly has been widely used in the design of advanced reactors. The gas-liquid two-phase flow characteristics in a tight lattice rod bundle are crucial for the development of nuclear fuel assemblies and the safety evaluation of nuclear power systems. The interfacial area concentration (IAC) and bubble size distribution (BSD) are the two key interfacial parameters for two-phase flow, which are very important for two-phase flow modeling. However, due to the complex nature of the two-phase and the cramped geometry of the tight lattice rod bundle, detailed experimental results within a tight lattice rod bundle subchannel are rarely reported. In this study, the dual Wire-Mesh Sensors (WMSs) were used to measure the air-water two-phase flow data in a double subchannel tight lattice rod bundle. The experiments were carried out at room temperature and pressure with the superficial liquid velocity ranging from 0.921 m/s to 1.84 m/s, and the superficial gas velocity ranging from 0.077 m/s to 1.103 m/s. The flow region includes bubbly flow, cap bubbly flow, and slug flow. Previous research has proved that the existing IAC and BSD calculation methods based on the high-speed tomography technique were biased, and unbiased calculation methods were developed in this paper. The interfacial results from the conventional and optimized methods were compared with each other. For the IAC measurement, the conventional method overestimated the IAC, and the deviation increases with the decrease of superficial liquid velocity and with the increase of superficial gas velocity, which reaches up to 78% in the slug flow conditions. For the BSD measurement, the conventional method slightly underestimates (overestimates) the proportion of small (large) bubbles. The accuracy of six different IAC correlations was also evaluated by the experimental data. The Hibiki-Ishii correlation and Shen-Dong correlation have a good prediction accuracy for IAC in the tight lattice rod bundle, with a deviation is <30% and small scattering." @default.
- W4310346509 created "2022-12-09" @default.
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- W4310346509 date "2023-01-01" @default.
- W4310346509 modified "2023-10-17" @default.
- W4310346509 title "Experimental investigation on interfacial parameters of two-phase flow in a tight lattice rod bundle with optimized data processing method" @default.
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- W4310346509 doi "https://doi.org/10.1016/j.icheatmasstransfer.2022.106530" @default.
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