Parametric effects on the flow redistribution in ballooned bundles evaluated by magnetic resonance velocimetry

AVS Oliveira, D Stemmelen, S Leclerc, T Glantz… - … Thermal and Fluid …, 2021 - Elsevier
When the water inventory evaporates during a hypothetical loss of coolant accident in the
core of a pressurized water reactor, the fuel rods temperature increases substantially …

3D magnetic resonance velocimetry for the characterization of hydrodynamics in microdevices: Application to micromixers and comparison with CFD simulations

F Guerroudj, L Guendouz, R Hreiz… - Chemical Engineering …, 2023 - Elsevier
Abstract 3D velocity field measurements in an arrow-type micromixer are performed using
nuclear magnetic resonance (NMR) imaging methods. A specific device has been set up …

Commissioning of an MRI test facility for CFD-grade flow experiments in replicas of nuclear fuel assemblies and other reactor components

M Bruschewski, K John, C Wüstenhagen… - … Engineering and Design, 2021 - Elsevier
A new test facility is presented, enabling single-phase isothermal fluid mechanics
experiments to support nuclear reactor safety studies. The applied measurement technique …

COAL Experiments Investigating the Reflooding of a 7× 7 Rod Bundle During a Loss-of-Coolant Accident: Effect of a Partially Blocked Area with Ballooned Rods

G Repetto, Q Grando, S Eymery… - Nuclear Science and …, 2024 - Taylor & Francis
During a loss-of-coolant accident in a pressurized water reactor, the drying of the fuel
assemblies leads to an increase in the fuel temperature and deformation of the fuel rod …

Experimental study on local droplet parameters in a deformed 2× 2 Rod bundle under air-water annular-mist flow

K Khasawneh, J Moon, Y Ko, JJ Jeong… - International Journal of …, 2023 - Elsevier
During reflood conditions following a loss-of-coolant accident in pressurized water reactors,
droplet flow affects the heat and mass transfer between liquid and steam phases. Flow …

Volumetric Measurements of Mean Velocity Vector and Reynolds Stress Tensor for CFD Validation: Magnetic Resonance Velocimetry in a Nuclear Fuel Assembly …

K John, S Romig, M Rehm, H Hadžić, P Pohl… - Flow, Turbulence and …, 2025 - Springer
Experimental studies in industrial-relevant geometries are of great value for validating
computational fluid dynamics (CFD). This study provides such data using Magnetic …

Reynolds stress tensor and velocity measurements in technical flows by means of magnetic resonance velocimetry: Data acquisition in the flow field behind the …

K John, C Wüstenhagen, S Schmidt… - tm-Technisches …, 2022 - degruyter.com
Abstract Magnetic Resonance Velocimetry (MRV), an imaging method based on Magnetic
Resonance Imaging (MRI), enables the measurement of flow parameters such as the …

Simulation of flow redistribution in 7× 7 ballooned fuel bundle experiments using DRACCAR code

JEL Valencia, AVS Oliveira, T Glantz… - … Engineering and Design, 2022 - Elsevier
IRSN has developed DRACCAR code in order to model loss of coolant accidents (LOCA) in
a light water nuclear reactor. The physics during a hypothetical loss of coolant accident …

Écoulements, transferts de masse et de chaleur

P Ruyer - 2022 - irsn.hal.science
Les écoulements et les transferts de masse et de chaleur en leur sein sont des sujets
d'intérêt pour de nombreuses situations accidentelles des études de sûreté des réacteurs …

Influence of Steam Deviation, Droplets Mass Flow Rate and Residual Power on Dispersed Flow Film Boiling at Sub-Channel Scale in Loca Conditions

JE Luna, A Vieira, T Glantz, A Labergue… - Droplets Mass Flow Rate … - papers.ssrn.com
After a hypothetical loss of primary coolant accident (LOCA) in a pressurized water reactor
(PWR), the reactor safety systems inject water into the core to cool it. During this re-flooding …