Experimental investigation of turbulent flow characteristics in cross-flow planes of a <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" altimg="si35.svg"><mml:mrow><mml:mn>5</mml:mn><mml:mo>×</mml:mo><mml:mn>5</mml:mn></mml:mrow></mml:math> rod bundle with a spacer grid

Matozinhos, Camila Freitas; Tomaz, Gabriel C.Q.; Nguyen, Thien; Hassan, Yassin A.

doi:10.1016/j.ijheatfluidflow.2020.108757

Cited by 18 publications

(1 citation statement)

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“…Dominguez-Ontiveros et al (2012) and Conner et al (2013) applied PIV to measure the longitudinal flow in a 5 × 5 rod bundle using a spacer grid, and they used FEP tubes as rod bundles to match the refractive index of water. Nguyen and Hassan (2017) and Matozinhos et al (2021) studied the turbulent length scales in the axial velocity field in a 5 × 5 rod bundle using a spacer grid. Qu et al (2019a), Qu et al (2019b), Qu et al (2019c), Qu et al (2021), Xiong et al (2020b), and Qu et al (2023) applied PIV to obtain the lateral flow in a 5 × 5 rod bundle using a spacer grid, and they investigated subchannel mixing models based on the experimental data.…”

Section: Introductionmentioning

confidence: 99%

Large eddy simulation of a turbulent flow in a 5 x 5 rod bundle with a mixing vane spacer grid

Lu,

2024

Front. Energy Res.

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In fuel assemblies of pressurized water reactors (PWRs), mixing-vane spacer grids are extensively employed to array fuel rods and enhance inter- and intra-subchannel mixing. The turbulent flow downstream of spacer grids is essential knowledge to support the design of spacer grids and mixing vanes. As a high-fidelity approach for turbulence simulation, large eddy simulation (LES) results are assessed with the high-resolution flow field measured with particle image velocimetry (PIV). The LES results reveal a mixing vane effect on vortex structures and Reynolds stresses. The mechanism of vortex generation at the mixing vanes and the development downstream of the spacer grid are visualized by the Q-criterion. The distributions of the root mean square fluctuating velocity and Reynolds stresses decay rapidly downstream of the spacer grid. The secondary flow intensity downstream of the spacer grid predicted by LES is evaluated and follows an exponentially decaying law with distance from the spacer grid.

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