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• W3131750248 endingPage "111080" @default.
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• W3131750248 abstract "Abstract A new test facility is presented, enabling single-phase isothermal fluid mechanics experiments to support nuclear reactor safety studies. The applied measurement technique Magnetic Resonance Velocimetry (MRV) is based on the medical imaging modality Magnetic Resonance Imaging (MRI). The experiments in this laboratory aim at providing the mean velocity field in models of nuclear fuel assemblies using isothermal water. Additionally, turbulence statistics in terms of the Reynolds stress tensor can be acquired. Since MRV is a non-optical measurement technique, there are no requirements on optical properties, and the investigated models can be quickly built with additive manufacturing techniques. Even though MRV offers a relatively low temporal and spatial resolution compared to laser-optical techniques and has some limitations regarding the test section materials, e.g., no metals, the main gain is that MRV provides a full three-dimensional representation of the flow field in short times. Both the model preparation and the measurement time are significantly faster than with laser-optical measurement techniques. The full-field experimental data obtained with MRV is often referred to as 'CFD grade data' as it enables a full-field validation of numerical solutions obtained with Computational Fluid Dynamics (CFD). As a commissioning experiment, measurements inside a 5x5 fuel element model of a pressurized water reactor (PWR) are conducted and compared with CFD results. The measured mean velocity field inside the PWR replica comprised of 2.9 Million velocity vectors was acquired in 79 min. In addition, turbulence measurements in a periodic hill channel demonstrate how MRV can be used to obtain all components of the Reynolds stress tensor. Although the measurements in this proof-of-concept study suffer from some measurement errors, all major error contributions are well known, and validated methods exist to overcome these shortcomings. In conclusion, this study shows how the velocity field in a specific fuel assembly configuration can be obtained highly efficiently using a specialized MRI laboratory." @default.
• W3131750248 created "2021-03-01" @default.
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• W3131750248 date "2021-04-01" @default.
• W3131750248 modified "2023-09-26" @default.
• W3131750248 title "Commissioning of an MRI test facility for CFD-grade flow experiments in replicas of nuclear fuel assemblies and other reactor components" @default.
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• W3131750248 doi "https://doi.org/10.1016/j.nucengdes.2021.111080" @default.
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