Influence of Local Flow Field on Flow Accelerated Corrosion Downstream from an Orifice
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概要
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Flow accelerated corrosion (FAC) rate downstream from an orifice was measured in a high-temperature water test loop to evaluate the effects of flow field on FAC. Orifice flow was also measured using laser Doppler velocimetry (LDV) and simulated by steady RANS simulation and large eddy simulation (LES). The LDV measurements indicated the flow structure did not depend on the flow velocity in the range of <I>Re</I> = 2.3×10<SUP>4</SUP> to 1.2×10<SUP>5</SUP>. Flow fields predicted by RANS and LES agreed well with LDV data. Measured FAC rate was higher downstream than upstream from the orifice and the maximum appeared at 2<I>D</I> (<I>D</I>: pipe diameter) downstream. The shape of the profile of the root mean square (RMS) wall shear stress predicted by LES had relatively good agreement with the shape of the profile of FAC rate. This result indicates that the effects of flow field on FAC can be evaluated using the calculated wall shear stress.
著者
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NAGAYA Yukinori
Institute of Nuclear Safety System, Inc.
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Murase Michio
Institute Of Nuclear Safety System
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Utanohara Yoichi
Institute Of Nuclear Safety System Inc.
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Nakamura Akira
Institute Of Biological Sciences University Of Tsukuba
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NAKAMURA Akira
Institute of Nuclear Safety System, Inc.
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