What question did this study set out to answer?

To measure flow characteristics through a nuclear reactor mixing grid using PIV techniques.

February 5, 2026

Flow through a hexagonal mixing grid with parabolic vanes measured experimentally by PIV in two planes at distances 1 and 5 × the maximum inscribed diameter D at Reynolds number based on D of 1.5⋅10

Key Points

To measure flow characteristics through a nuclear reactor mixing grid using PIV techniques.
Applied Particle Image Velocimetry to analyze flow patterns.
Conducted experiments with an empty mixing grid without fuel rods.
Measured flow at distances of 1 and 5 times the maximum inscribed diameter.
Investigated effects of Reynolds number on flow characteristics and turbulence.
Observed distinct patterns of jets and wakes influenced by mixing vanes.
Flow showed low dependence on Reynolds number.
Flow characteristics significantly varied with downstream distance.
Present spatial maps of mean velocity, turbulence intensity, and turbulence flatness.

Abstract

Particle Image Velocimetry (PIV) method is used to measure the flow through a prototype mixing grid for nuclear reactor. In this preliminary experiment, there are no fuel rods, the grid is empty. We observe the pattern of jets and wakes, which is deformed by the transient flow introduced by the mixing vanes. The flow displays relatively low dependence on Reynolds number and high dependence on the downstream distance. In the contribution, there are shown the spatial maps of mean velocity, turbulence intensity and turbulence flatness.

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