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Particle image velocimetry measurements for transition flow regime through a porous blocked subchannel in a 61-pin wire-wrapped bundle

Nuclear Engineering and Design, ISSN: 0029-5493, Vol: 424, Page: 113314
2024
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Wire-wrapped rod bundles are used in the liquid metal fast reactor (LMFR) core due to their high operational efficiencies and enhanced thermal–hydraulic characteristics. Flow blockages are considered a non-negligible accident scenario that can obstruct the coolant flow area, degrade local thermal–hydraulic performance, and lead to fuel cladding failure in LMFR rod bundles. Experimental investigation of porous blockage media is critical to understanding the fluid dynamics effects of partially blocked subchannels. Previous experimental works used particle image velocimetry (PIV) to investigate scenarios of totally blocked subchannels, but few experimental results are currently available for partially blocked subchannels. In this experimental study, the local fluid flow effects of a porous blockage were studied in a 61-pin wire-wrapped rod bundle under a transitional flow regime with a Reynolds number of 5,000 using the matched-index-of-refraction (MIR) method in conjunction with the time-resolved PIV (TR-PIV) measurement technique. Three interior measurement planes about the flow blockage were studied by computing first- and second-order statistics, including the mean velocity, root-mean-square fluctuating velocity, and Reynolds stress. The high-fidelity PIV results acquired revealed important flow characteristics upstream and downstream of the porous blockage in the locally-affected subchannels. This experimental PIV flow field data for a porous blockage media can be used for validation in computational fluid dynamics (CFD) simulations and model development.

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