Influence of thermomagnetic convection and ferrofluid thermophysical properties on heat transfers in a cylindrical container heated by a solenoid

Raphael Zanella (1) , Caroline Nore (1) , Frédéric Bouillault (2) , Jean-Luc Guermond (3) , Xavier Mininger (2)

1 LIMSI - Laboratoire d'Informatique pour la Mécanique et les Sciences de l'Ingénieur
2 GeePs - Laboratoire Génie électrique et électronique de Paris
3 TAMU - Department of Mathematics [Texas]

The thermal convection in a cylindrical container heated by a solenoid and cooled with an oil-based ferrofluid is numerically studied. The temperature and the velocity fields are compared to those obtained with pure oil to assess the benefits of using ferrofluids for cooling systems like electrical transformers. The influence of the magnetic body force on the flow and the temperature in the system is investigated in various configurations. One original result established in this paper is that the changes in the fluid properties due to the presence of nanoparticles, such as viscosity and thermal conductivity, have a significant impact on the heat transfers. A second result is that the use of a ferromagnetic core enhances the cooling.

Mots clés: Ferrofluid; Natural convection; Thermomagnetic convection; Finite element method; Power transformer

Domaines: Electromagnétisme; Milieux fluides et réactifs; Modélisation et simulation

Raphael Zanella, Caroline Nore, Frédéric Bouillault, Jean-Luc Guermond, Xavier Mininger. Influence of thermomagnetic convection and ferrofluid thermophysical properties on heat transfers in a cylindrical container heated by a solenoid. Journal of Magnetism and Magnetic Materials, 2019, 469, pp.52-63. ⟨10.1016/j.jmmm.2018.08.016⟩. ⟨hal-01942609⟩