77th Annual Meeting of the APS Division of Fluid Dynamics (November 24, 2024 — November 26, 2024)
P2692019: Magnetic Field-Induced Vortex Separation
DOI: https://doi.org/10.1103/APS.DFD.2024.GFM.P2692019
Magnetophoresis is the movement of particles in a liquid medium under magnetic field. The distribution of magnetic field around wire plays a crucial role in capturing the paramagneticparticles. The stainless steel 430 is ferromagnetic in nature, and becomes magnetized in the presence of an external magnetic field. When magnetic field is applied, the region where magnetic field aligns the stainless steel, a strong local magnetic field gradient has been created around the wire. The circular shape of the stainless steel wire further influences the magnetic field distribution. It causes the magnetic field lines to bend and converge, enhancing the gradient effect.The experimental observation revealed that, upon imposing the magnetic field, the paramagnetic particles form vortices close to the wire where the magnetic field gradient is high. This phenomenon is caused by magnetic convection, which moves the particles toward the regions of stronger magnetic field gradient, effectively separating them from the surrounding fluid.During the experiments, we observed a very fascinating phenomenon that could significantly influence the way we think about particle capture in magnetic fields. The vortices form symmetric swirling zones around the wires, each acting like a magnetic whirlpool, drawing in particles with strong magnetic force. These vortices are not random but well structured, and a result of direct interaction between the magnetic field gradient and paramagnetic particles.
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