Impact of Magnets on Ferrofluid Cooling Process: Experimental and Numerical Approaches

The cooling performance of vegetable oil seeded with ferromagnetic nanoparticles is tested on a prototype electric transformer coil. The system is investigated both experimentally and numerically. The numerical simulations are done with finite elements assuming axisymmetry. The experimental and numerical results match very well with each other. The numerical tool is also used to investigate the impact of an annular magnet enclosing the setup. The orientation of the remanent magnetic induction of the magnet is observed to play a significant role in determining the cooling efficiency.