Finite element analysis for electromagnetic flow with applied magnetic field

Hiyama, Tomoyuki ; Ohshima, Hiroyuki; Yamaguchi, Akira*; Takata, Takashi*

In the piping system of fast breeder reactor, mixture of hot and cold liquid sodium causes thermal striping phenomena in which fluid temperature fluctuation is transmitted to the structure of the piping. The thermal striping causes the thermal stress in the piping structure and may damage it. It is thought that the liquid sodium can be controlled to reduce temperature fluctuation by applying magnetic field from the outside of the piping. In this study a numerical simulation code has been developed using a Finite Element Method to simulate electromagnetic flow fields controlled by applying the magnetic field. Numerical analyses of T-junction piping flow mixing have been carried out in condition of, "no magnetic field", "ladder type magnetic field", and "surround type magnetic field". The results have been compared for evaluating mitigation effects on the temperature fluctuation from the viewpoints of intensity and power spectrum.