| Title |
Identification between Local Wall Thinning and Turbulent Velocity Components by Flow Acceleration Corrosion inside Tee of Pipe System |
| Authors |
김경훈(Kyung Hoon Kim) ; 이상규(Sang Kyu Lee) ; 조연수(Yun Su Cho) ; 황경모(Kyung Mo Hwang) |
| Keywords |
감육 ; 유동가속부식 ; 편향 난류 유동 ; 국부감육 ; 알칼리 금속염 Wall thinning ; Flow accelerated corrosion ; Deflected turbulent flow ; Local wall thinning ; Alkali metallic salt |
| Abstract |
When pipe components made of carbon steel in nuclear, fossil, and industry are exposed to flowing fluid, wall thinning caused by FAC(flow accelerated corrosion) 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 coefficient related to the local wall thinning was performed. Experiment and numerical analyses for tee of down scaled piping components were performed and the results were compared. In particular, flow visualization experiment which was used alkali metallic salt was performed to find actual location of local wall thinning inside tee components. To disclose the relationship between turbulence coefficients and local wall thinning, numerical analyses were performed for tee components. The turbulence coefficients based on the numerical analyses were compared with the local wall thinning 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. |