https://doi.org/10.1140/epjs/s11734-025-01908-1
Regular Article
Thermomagnetic convection in a stable circular Couette ferrofluid flow with a radial temperature gradient
1
Laboratoire Ondes et Milieux Complexes, CNRS UMR 6294, Université Le Havre Normandie, Normandie University, 53, Rue de Prony, 76058, Le Havre, France
2
Department of Mechanical Engineering, Jeonbuk National University, 567 Baekje-daero, Deokjin-gu, Jeonju-si, 54896, Jeollabuk-do, Republic of Korea
a
innocent.mutabazi@univ-lehavre.fr
Received:
31
August
2025
Accepted:
3
September
2025
Published online:
12
September
2025
Linear stability of a ferrofluid flow in a cylindrical annulus with an outward heating and an imposed magnetic field is investigated for Rayleigh-stable regimes: the sole rotation of the outer cylinder and the solid body rotation of both cylinders. The magnetic field produced by a stack of magnets located inside the inner cylinder coupled with the radial temperature gradient generates the Kelvin force whose non-conservative term acts as a thermal buoyancy with a magnetic gravity and can destabilize the flow, even in the microgravity conditions. The critical parameters of thermomagnetic convection induced by this force are determined for water-based and oil-based ferrofluids corresponding to different diffusive properties. An energy analysis is performed to evaluate the role of the different mechanisms responsible for the flow destabilization.
© The Author(s) 2025
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