双相不锈钢管固液两相流动腐蚀的数值模拟

在碳钢流动腐蚀数值模拟的基础上，针对管道流动体系，对固液两相流条件下双相不锈钢的流动腐蚀进行了数值模拟.模拟了固液两相流体动力学过程和双相不锈钢腐蚀动力学过程，模拟计算得到的腐蚀速率与实测值基本一致，表明建立的两相不锈钢流动腐蚀的综合数学模型是正确的，揭示了两相流中双相不锈钢的流动腐蚀机理，并进行了实验验证.两相流中双相不锈钢流动腐蚀的加剧主要是由于颗粒相的存在会大大强化液相流体的流体力学因素，导致钝化膜内传质速度加快所致.计算结果同时也表明，对于表面覆盖有钝化膜的材料的数值模拟，建立合理的流动腐蚀动力学模型是数值计算方法应用成功与否的关键.

NUMERICAL SIMULATION OF FLOW INDUCED CORROSION OF DUPLEX STAINLESS STEEL IN LIQUID-PARTICLE TWO-PHASE IN-PIPE FLOW

On the basis of numerical simulation of flow induced corrosion of carbon steel in two-phase flow, the flow induced corrosion of duplex stainless steel in liquid-particle two-phase in-pipe flow was numerically studied. The results showed that, by numerically simulating liquid-particle two-phase flow kinetic process and duplex stainless steel corrosion kinetics, the corrosion rates of duplex stainless steel were computed and the numerical corrosion rates were well in agreement with measured ones. This illustrates that the established corrosion overall model for duplex stainless steel in two-phase fluid is correct and at the same time its flow induced corrosion mechanism is uncovered and verified by tests. The presence of particle phase in fluid greatly strengthens hydrodynamic factor,leading to faster mass transfer process in passive film of duplex stainless steel than liquid single-phase, and causing serious erosion-corrosion. The modeled results also show that the ability to simulate corrosion of materials with surface passive film to some extent depends on their corrosion kinetics process tested by experiments.