Abstract:A novel flowable tritium breeder is a tritium breeder composite material which can flow through the combination of liquid metal matrix and liquid dispersion insulating phase. Such a liquid-liquid dual-phase composite can not only inhibit the magnetohydrodynamic (MHD) resistance effect of the current liquid metal or molten salt tritium breeders, but also address the problems of solid tritium breeders such as low tritium release efficiency, low heat transfer, fragile and easy blockage of gas channel. In this paper, the liquid metal GaInSn alloy was used to simulate the flowable behavior of lithium-based liquid tritium breeder, and composite with quenching oil simulating liquid dispersion insulation phase to form a flowable tritium breeder material. In this paper, a flowable metal with low conductivity characteristics was prepared, and the liquid metal GaInSn alloy and liquid dispersed insulating phase quenching oil were mixed into a new fluid. The influence of magnetic flux, mixing ratio and temperature on its viscosity was studied, and the change of conductivity of fluid with the quenching oil of the added dispersed insulating phase was tested. The results showed that When the magnetic induction intensity exceeds a certain value, the viscosity of the fully liquid metal is significantly higher than that of the composite material with quenched oil, indicating that the addition of quenched oil can effectively reduce the MHD effect, and the quenched oil composite material will have lower flow resistance under a strong magnetic field. The conductivity of the fluid was tested and it was found that the conductivity decreased approximately exponentially with the increase of quenching oil. The conductivity of the flowable tritium breeder increased abruptly after standing for a period of time, and then stabilizes again at the new conductivity level. On condition that it was re-sonicated, it could be restored to its original conductivity again, which meant that it could be recycled in practical applications.