【摘要】 铅铋共晶（Lead-bismuth Eutectic,LBE）合金由于其强腐蚀性，长时间与材料表面接触会产生一系列腐蚀颗粒，这些颗粒在介质中的迁移和沉积可能导致流体通道堵塞，从而直接影响反应堆的安全性并缩短其使用寿命。本文基于改进的欧拉沉积模型，利用MATLAB建立了水平管道边界层内LBE介质中颗粒沉积的求解模型。对比了LBE介质与空气介质中颗粒的沉积特性，并分析了壁面粗糙度、流体速度、颗粒种类及流体温度对LBE介质中颗粒沉积的影响。结果表明：LBE介质中颗粒沉积速度随颗粒直径呈“S”型变化；壁面粗糙度对小颗粒的沉积速度影响显著，而流体速度则对大颗粒的沉积速度影响更为显著；此外，对于等温工况，流体温度对颗粒沉积速度的影响相对较小；对于二维圆管，不考虑浮力及Saffman升力的影响，颗粒密度对颗粒沉积速度影响也相对较小。更多还原

【Abstract】 [Background] The lead-bismuth eutectic(LBE) alloy, owing to its pronounced corrosive properties, generates a series of corrosion particles upon prolonged contact with material surfaces. The migration and deposition of these particles within the medium can potentially result in clogging, thereby directly compromising the reactor’s safety and reducing its operational lifespan. [Purpose] This study aims to investigate the deposition velocity characteristics of particles within LBE media and the factors that influence them. [Method] A solution model for determining particle deposition velocity within the boundary layer of horizontal pipes was formulated, drawing upon the particle transport equation within the Eulerian framework. After establishing the boundary conditions for the given model, it was discretized and solved utilizing MATLAB software. Subsequently, the model was validated through comparison with experimental data obtained from air media and was further adapted for application in LBE media. [Results] The comparison results reveal that the particle deposition rate in LBE media exhibits an "S"-shaped pattern as a function of particle diameter. Notably, wall roughness exerts a significant influence on the deposition rate of smaller particles, whereas fluid velocity has a more pronounced effect on the deposition rate of larger particles. Additionally, the impacts of particle type and fluid temperature on particle deposition rate are relatively minor. [Conclusions] These findings of this study provide important theoretical support for understanding the particle deposition behavior in LBE media and have significant implications for optimizing reactor design and enhancing safety.更多还原