Publication date: May 14, 2026
To ensure the accuracy of single-point sampling for airborne effluents in nuclear facilities, it is critical to clarify how stack and duct configurations regulate the flow field uniformity (velocity distribution) and aerosol distribution of the effluents. Taking the exhaust system of nuclear facilities as the research object, this study built a modular experimental platform covering seven duct configurations. Combined with experimental measurements and computational fluid dynamics (CFD) simulations, it systematically explored the impacts of duct configurations (including I, L, S, U types with smooth or right-angle transitions) and Reynolds numbers (Re = 5 cD7 104-1. 5 cD7 105) on the coefficient of variation (COV) of velocity distribution and that of polydisperse aerosol distribution (average particle size: 5. 2 μm). The CFD model established achieved excellent validation accuracy: over 93% of velocity data points showed a deviation between simulated and experimental values within +/-15%, and the ratio of simulated to experimental aerosol concentration values followed a log-normal distribution with a mean (μ) of 1. 13 and a standard deviation (σ) of 0. 26. For flow field uniformity: long straight ducts lacked sufficient turbulence, resulting in a velocity COV >14% even at a length-to-hydraulic diameter ratio (L/D) of 20; elbows effectively reduced the velocity COV, with right angle transition elbows having a stronger turbulence effect than smooth-transition ones (e. g., L2 circular ducts reached a velocity COV
| Concepts | Keywords |
|---|---|
| Experimental | aerosols |
| Hydraulic | effluents |
| Nuclear | exposure |
| Uniformity | nuclear workers |
| occupational |
Semantics
| Type | Source | Name |
|---|---|---|
| disease | MESH | CFD |