Hydrodynamic parameters affecting flow-accelerated corrosion in elbows

Flow-accelerated corrosion (FAC) is a serious degradation mechanism affecting carbon-steel piping in the secondary coolant systems of nuclear power plants. Many researchers have investigated the correlation between wall thinning and hydrodynamic parameters; however, their relationship remains unclea...

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Vydané v:Nuclear engineering and technology Ročník 57; číslo 4; s. 103293
Hlavní autori: Moon, Seongin, Lee, Jong-Yeon, Kim, Kyung-Mo, Han, Soon-Woo, Lee, Gyeong-Geun, Maeng, Wan-Young, Kim, Dong-Jin, Jo, Hyunseung, Kim, Shin Hyuk
Médium: Journal Article
Jazyk:English
Vydavateľské údaje: Elsevier B.V 01.04.2025
Elsevier
한국원자력학회
Predmet:
Computational fluid dynamics
Elbow
Flow-accelerated corrosion
Hydrodynamic parameters
Wall thinning
원자력공학
Wall thinning
Computational fluid dynamics
Hydrodynamic parameters
Elbow
Flow-accelerated corrosion
ISSN:1738-5733, 2234-358X
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Popis
Shrnutí:Flow-accelerated corrosion (FAC) is a serious degradation mechanism affecting carbon-steel piping in the secondary coolant systems of nuclear power plants. Many researchers have investigated the correlation between wall thinning and hydrodynamic parameters; however, their relationship remains unclear. In this study, the hydrodynamic parameters influencing FAC in elbow sections were investigated for identifying the locations highly susceptible to FAC. Accelerated FAC tests and computational fluid dynamics (CFD) analyses were conducted on a specimen containing elbow sections. The results revealed that the side of the elbow pipe was the most susceptible to FAC because it experienced the most severe wall thinning. The velocity and vorticity vectors obtained from the CFD analysis were decomposed into axial, circumferential, and radial components within a cylindrical coordinate system to evaluate their effects. We found that all velocity and vorticity components contribute to the rate of wall thinning induced by FAC. Therefore, a combination of velocity and vorticity components should be used as hydrodynamic parameters to characterize FAC-induced wall thinning. Specifically, the circumferential velocity and axial vorticity were identified as dominant parameters influencing FAC in the elbows.
ISSN:1738-5733
2234-358X
DOI:10.1016/j.net.2024.10.055