A123 エルボ管におけるFAC減肉速度と物質移行係数の評価について : (3) INSSエルボ管における数値計算に基づく物質移行係数の予測(OS2 保全・設備診断技術(1))

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  • A123 Evaluation of wall thinning rate of FAC and mass transfer coefficient in elbow : (3) Numerical estimation of mass transfer coefficient in INSS elbow

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Flow accelerated corrosion (FAC) is one of the causes for wall thinning mechanisms in carbon steel pipes. We suppose that the corrosion is caused by the mass transfer diffusion of ferrous ion from the wall. In order to simulate the mass transfer coefficient in pipe flow, we adopt the analogy between mass transfer and heat transfer, and calculate the unsteady temperature field using the Large Eddy Simulation. In this paper, we study the effect of flow field on the mass transfer coefficient in an INSS elbow which added the short straight pipe in the middle of 90 degree elbow. At a Reynolds number of 15000, mass transfer coefficient is increased around outside wall surface of elbow section caused by mean flow and increased around inside wall surface of short straight section caused by unsteady flow.

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