B107 流れ加速型腐食の予測手法の開発(1) : 流体力学因子の評価と減肉率との相関(流れ加速型腐食・***ージョン・振動,OS6 保全・設備診断技術)

概要

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Flow Accelerated Corrosion (FAC) requires considerable attention in plant piping management, for its potential of catastrophic pipe rupture of main piping systems. In view of fluid dynamics, the most essential factor to be considered is mass transfer at the inner surface of the pipe. In the previous report, the authors have proposed a new mass transfer coefficient model, which is adaptable to various types of piping elements with strong turbulence, by introducing the idea of "Effective Friction Velocity" from the hydraulics in the viscous sub-layer along the wall. And in the present report, the model has been revised with rational logic, and verified with additional data obtained in FAC experiments with AVT water condition and CFD for the flow in the experiments. Furthermore, some discussion was made by considering the correlation of the thinning rate and the product of mass transfer and iron solubility, for the prospect of thinning rate prediction.
一般社団法人日本機械学会の論文
2009-06-28