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Flow produced by a free-moving floating magnet driven electromagnetically

Saúl Piedra1,*, Joel Román2, Aldo Figueroa3,†, and Sergio Cuevas2

  • 1Centro de Investigación en Ciencias, Universidad Autónoma del Estado de Morelos, Cuernavaca, Morelos 62209, México
  • 2Instituto de Energías Renovables, Universidad Nacional Autónoma de México, Privada Xochicalco s/n Temixco, Morelos 62580, México
  • 3CONACYT - Centro de Investigación en Ciencias, Universidad Autónoma del Estado de Morelos, Cuernavaca, Morelos 62209, México

  • *Current address: CONACYT-CIDESI, Centro Nacional de Tecnologías Aeronáuticas (CENTA), Colón, Queretaro De Arteaga, México.
  • †Corresponding author: alfil@uaem.mx
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Phys. Rev. Fluids 3, 043702 – Published 30 April, 2018

DOI: https://doi.org/10.1103/PhysRevFluids.3.043702

Abstract

The flow generated by a free-moving magnet floating in a thin electrolyte layer is studied experimentally and numerically. The magnet is dragged by a traveling vortex dipole produced by a Lorentz force created when a uniform dc current injected in the electrolyte interacts with the magnetic field of the same magnet. The problem represents a typical case of fluid-solid interaction but with a localized electromagnetic force promoting the motion. Classical wake flow structures are observed when the applied current varies in the range of 0.2 to 10 A. Velocity fields at the surface of the electrolyte are obtained for different flow conditions through particle image velocimetry. Quasi-two-dimensional numerical simulations, based on the immersed boundary technique that incorporates the fluid-solid interaction, reproduce satisfactorily the dynamics observed in the experiments.

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Phys. Rev. Fluids 3, 043702– Published 30 April, 2018
  • Received 8 May 2017
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