Abstract: On the basis of single-phase flowing model, two-phase liquid/solid flowing theory was introduced to study numerically the flow induced corrosion of carbon steel in 3.5% NaCl+5% sand. It was found that the mechanics parameters of particle-phase including impact angle, impact frequency, impact velocity strongly influenced the hydrodynamic and mass transfer parameters (surface shear stress, mass transfer coefficient), which sharply increased erosion-corrosion rate of carbon steel within the limits of 0—18m•s^-1 flow velocity. The results further showed that the numerical corrosion rates were almost equal to the measured rates. Thus it was verified that under flowing condition the electrochemical corrosion action still played an important role in corrosion synergism of carbon steel. With further increasing flowing velocity, wear rate was still small, but it could not be ignored.

Key words:

碳钢, 磨损腐蚀, 数值模拟, 协同效应

摘要： 在单相流数值计算的基础上，引入固相颗粒运动理论，对双相流中的碳钢磨损腐蚀进行了数值模拟.结果表明：在0～18m•s^-1流速范围内，固体颗粒与材料壁面的碰撞角度、碰撞频度和碰撞速度等颗粒相力学参数对表面切应力、传质系数影响强烈，导致碳钢磨损腐蚀加剧，但对碳钢的切削磨耗作用不大.腐蚀速度的模拟计算值与实测值基本一致，验证了碳钢在两相流加剧腐蚀的协同效应中腐蚀电化学作用仍占主导地位.随着流速进一步增大，磨耗量虽小，但会有所增加.

关键词:

碳钢, 磨损腐蚀, 数值模拟, 协同效应