C218 FACによる減肉位置における物質伝達係数(配管減肉評価法(2),OS5 保全・設備診断技術),動力エネルギーシステム部門20周年,次の20年への新展開)

概要

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The mass transfer distribution from the pipe wall to the bulk water is electrochemically estimated to study the flow effect on pipe wall thinning induced by FAC. The distribution of the mass transfer coefficient in the flow direction behind the orifice whose open diameter ratio is simulated to the orifice of the Mihama 3rd unit is similar to the wall thinning distribution of the unit's B-line. It suggests that the local wall thinning distribution is determined by the mass transfer distribution. According to the parameter study, the distribution shape is little affected by the flow rate, though the magnitude of the mass transfer coefficient is monotonically increased with the flow rate increase. The distribution is affected by the orifice open ratio. The mass transfer coefficient from the sin-wave-shape wall of the pipe is affected by the surface asperity. Therefore, the coefficient at the upstream side slope of the sin wave becomes maximum locally and the coefficients at the wave trough and downstream side slope become minimum locally.
一般社団法人日本機械学会の論文
2010-06-20