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Hydrodynamic Analysis on Flow Accelerated Corrosion of Carbon Steel Piping with Orifice Structure

机译：孔板结构碳钢管道流动加速腐蚀的流体动力学分析

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One of the significant tasks for stable supply of energy in geothermal, thermal or nuclear power plants is corrosion management of the pipe systems. Particularly, flow accelerated corrosion (FAC) is known as the cause of local thinning and rupture of the piping wall. In order to predict and inspect this phenomenon, various models based on reaction kinetics and mass transfer of chemical compounds have been proposed so far. However, complicated corrosion has not been sufficiently reproduced. Therefore, in our research, we use a prediction formula of FAC obtained from laboratory experiment considering the shear stress to express the effect of flow field. We set a carbon steel pipe with an orifice structure as a simulation model and reproduced fluid flow and wall corrosion using the lattice Boltzmann method (LBM). Our calculation by LBM reflects the local thinning of steel carbon piping caused by the complex flow near the wall surface and the simulation results showed good agreement with the measured data in corrosion experiment. Our research suggested that the analysis focusing on the physical influence of the flow field is effective for the prediction of wall thinning with high accuracy.
机译：在地热，热电厂或核电厂中稳定供应能源的重要任务之一是管道系统的腐蚀管理。特别地，已知流动加速腐蚀（FAC）是管道壁局部变薄和破裂的原因。为了预测和检查这种现象，迄今为止已经提出了基于反应动力学和化合物的传质的各种模型。但是，复杂的腐蚀没有得到充分的再现。因此，在我们的研究中，我们使用从实验室实验中获得的考虑剪切应力的FAC预测公式来表达流场的影响。我们将具有孔口结构的碳钢管作为模拟模型，并使用格子Boltzmann方法（LBM）复制了流体流动和壁腐蚀。我们的LBM计算反映了壁面附近复杂流动引起的钢碳管道局部变薄，模拟结果与腐蚀实验中的测量数据吻合良好。我们的研究表明，以流场的物理影响为重点的分析对于准确预测壁变薄是有效的。

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