Correlation between Flow Accelerated Corrosion and Wall Shear Stress Downstream from an Orifice
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概要
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Flow accelerated corrosion (FAC) thinning rate downstream from an orifice was measured under different velocity conditions in a high-temperature water test loop to understand the effects of flow velocity on FAC thinning rate. The FAC tendency differed downstream and upstream from the orifice. The metal loss increased linearly with time downstream from the orifice, though metal loss rate gradually decreased with time upstream. FAC rate increased as flow velocity increased, particularly from 1D to 3D. The maximum FAC thinning rate increased in proportional to the 0.51th power of the mean cross-sectional velocity in this experiment. The root mean square (RMS) of wall shear stress predicted by large eddy simulation (LES) had a clear relationship with FAC thinning rate. This result indicated that FAC thinning rate can be described as a function of the wall shear stress. Additionally, the mass transfer coefficient estimated from the RMS of wall shear stress had an almost linear correlation with FAC thinning rate.
著者
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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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NAGAYA Yukinori
The Kansai Electric Power Co., Inc.
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KAMAHORI Koichi
Institute of Nuclear Safety System, Inc.
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