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Journal Articles Journal of Magnetism and Magnetic Materials Year : 2024

Thermomagnetic convection control strategies for electromagnetic devices immersed in a ferrofluid

Abstract

This paper presents new control strategies for improving the thermomagnetic convection intensity in electromagnetic devices. The system consists of a winding prototype immersed in a ferrofluid solution based on magnetic nanoparticles. The whole system is exposed to an external magnetic field generated by an annular magnet placed against the tank. When possible, experimental results are compared with numerical ones obtained using the finite element method in a 2D-axisymmetric setting. The first control strategy consists of assessing the impact of Curie’s temperature on heat removal. Numerical calculations show that the maximum winding temperature decreases by 2.2 °C with the use of magnetic nanoparticles with the lowest Curie temperature. Employing an auxiliary magnetic field may be another method for monitoring the thermomagnetic convection. The number of streamlines increases in the upper part of the tank due to the intensification of the magnetic force at the top of the winding. It is shown that magnetization, orientation, and location of the magnet play a crucial role in maximizing heat transfer inside the tank. The experiment shows a temperature decrease of 9°C at the top of the winding if an external magnetic field is applied.
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Avant la publication
Sunday, September 8, 2024
Embargoed file
Sunday, September 8, 2024
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Dates and versions

hal-04496453 , version 1 (08-03-2024)

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Sleimane Nasser El Dine, Xavier Mininger, Caroline Nore. Thermomagnetic convection control strategies for electromagnetic devices immersed in a ferrofluid. Journal of Magnetism and Magnetic Materials, 2024, ⟨10.1016/j.jmmm.2024.171876⟩. ⟨hal-04496453⟩
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