Rotating Permanent Magnets Stirring Liquid GaInSn Alloy 

Two-cylinder rotating permanent magnets system is used to stir pool of liquid. Using two 40 mm magnets it is possible to stir 10 kg (1.7 liters) of liquid metal up to 500 mm/s. The video showcases different system setups resulting in vastly different flow types. The stirring is completely contactless and the physical phenomena is based on induced currents and Lorentz forces acting upon the metal.
The liquid metal used is eutectic alloy of Gallium, Indium and Tin.
Publication on this: iopscience.iop...