Verification of the interrelation between local wall thinning and velocity components observed in the deflected turbulent flow inside orifice of carbon steel piping |
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Authors: | Kyung Hoon Kim Sang Hoon Park Kyeong Mo Hwang |
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Affiliation: | (1) Department of Mechanical Engineering, Kyung Hee University, 1 Seochenon-dong, Gihung-gu, Yongin-si, Gyeonggi-do, 449-701, Republic of Korea;(2) Korea Power Engineering Co., Inc, Goyang-si, Gyeonggi-do, 446-713, Republic of Korea |
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Abstract: | When components made of carbon steel in nuclear, fossil, and industry plants are exposed to flowing fluid, wall thinning caused
by flow accelerated corrosion (FAC) can be generated and eventually ruptured at the portion of pressure boundary. A study
to identify the locations generating local wall thinning and to disclose turbulence coefficients related to the local wall
thinning was performed. Experiments and numerical analyses for orifice of downscaled piping components were performed and
the results were compared. Based on the results that the flow behaviors inside piping components can be simulated by numerical
analysis, numerical analyses for magnified models to actual size of plants were performed. To disclose the relationship between
turbulence coefficients and local thinning rate, numerical analyses were preformed for orifice components included in the
main feedwater systems. The turbulence coefficients based on the numerical analyses were compared with the local wear rate
based on the measured data. From the comparison of the results, the vertical flow velocity component (Vr) flowing to the wall
after separating in the wall due to the geometrical configuration and colliding with the wall directly at an angle of some
degree was analogous to the configuration of local wall thinning. |
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