Migration behavior of magnetic corrosion products in blanket cooling pipes under a strong magnetic field

Activated corrosion products (ACPs), as a major radiation source term in fusion reactors, are of critical concern for equipment maintenance, radiation protection, and radioactive waste management. During the operation of CFETR, the strong magnetic fields of several tesla are generated in the blanket modules. The magnetic field interacts with magnetic ACPs, influencing their migration and eventual deposition in cooling pipes. To investigate this effect, a finite element model was first developed to obtain the CFETR magnetic field distribution. Subsequently, a Computational Fluid Dynamics-Discrete Phase Model (CFD-DPM) was established to simulate the migration process of Fe 3 O 4 particles. The coupled effects of magnetic field characteristics, flow field distribution, and particle diameter on the migration behavior were systematically analyzed. The results indicate that the magnetophoretic force acting on Fe 3 O 4 particles drives them toward regions of higher magnetic field strength, leading to particle deposition predominantly on the high magnetic field side. Local variations in magnetic field distribution within modules also influence the deposition behavior. In addition, the effect of the magnetic field on particle deposition becomes more significant with increasing particle diameter. The findings offer valuable insights and quantitative support for subsequent studies on flow characteristics, heat transfer performance, and radiation effects in blanket cooling systems.