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http://dx.doi.org/10.3795/KSME-B.2011.35.7.717

Relationship Between Local Wall Thinning and Velocity Components of Deflected Turbulent Flow Inside the Tee Sections of Carbon Steel Piping  

Kim, Kyung-Hoon (Dept. of Mechanical Engineering, Kyung Hee Univ.)
Hwang, Kyeong-Mo (Korea Power Engineering Co., Inc)
Kang, Deok-Won (Dept. of Mechanical Engineering, Kyung Hee Univ.)
Publication Information
Transactions of the Korean Society of Mechanical Engineers B / v.35, no.7, 2011 , pp. 717-722 More about this Journal
Abstract
The aim of this study is to identify the locations at which local wall thinning occurs and to determine the turbulence coefficients related to local wall thinning. Experiments and numerical analyses of the tee sections of different down-scaled piping components were performed and the results were compared. Numerical analyses of full-scale models of actual plants were performed in order to simulate the flow behaviors inside the piping components. In order to determine the relationship between the turbulence coefficients and the rate of local wall thinning, numerical analyses of the tee components in the main feedwater systems were performed. The turbulence coefficients obtained from the numerical analyses were compared with the local wear rate obtained from the measurement 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.
Keywords
Deflected Turbulent Flow; Flow Accelerated Corrosion; Local Wall Thinning; Least Squares Fitting;
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