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Reverse streaming generated by a free-moving magnet

Published online by Cambridge University Press:  18 July 2025

Aldo Figueroa Open the ORCID record for Aldo Figueroa [Opens in a new window] ,
Saúl Piedra Open the ORCID record for Saúl Piedra [Opens in a new window] ,
Miguel Piñeirua Open the ORCID record for Miguel Piñeirua [Opens in a new window]  and
Sergio Cuevas Open the ORCID record for Sergio Cuevas [Opens in a new window]
Aldo Figueroa*
Affiliation:
Secihti-Centro de Investigación en Ciencias, Universidad Autónoma del Estado de Morelos, Av. Universidad 1001 Chamilpa, Cuernavaca 62209, Morelos, Mexico Institut de Recherche sur la Biologie de l’Insecte, Université de Tours, Parc de Grandmont, Tours 37200, France
Saúl Piedra
Affiliation:
Secihti-Centro de Ingeniería y Desarrollo Industrial, Querétaro De Arteaga 76125, Mexico
Miguel Piñeirua
Affiliation:
Institut de Recherche sur la Biologie de l’Insecte, Université de Tours, Parc de Grandmont, Tours 37200, France
Sergio Cuevas
Affiliation:
Instituto de Energías Renovables, Universidad Nacional Autónoma de México, Temixco, Morelos 62580, Mexico
*
Corresponding author: Aldo Figueroa, alfil@uaem.mx
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Abstract

Generation of steady streaming vortices is usually accomplished by mechanically vibrating bodies, as occurs in several microfluidic applications for mixing, as well as for transport and handling of microparticles. Here, we propose the generation of streaming from the harmonic electromagnetic forcing of a free-moving circular magnet held afloat on a shallow electrolytic layer, and show that the sense of rotation of steady vortices is the opposite to that of the classical streaming flow. Reverse streaming is attributed to the coupling between the fluid and the free-moving body. Analytical solutions offer a physical rationale for the observed flow dynamics, while numerical simulation reproduces the experimental observations satisfactorily.

JFM classification

Vortex Flows: Vortex dynamics MHD and Electrohydrodynamics: MHD and Electrohydrodynamics

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Type
JFM Papers
Information
Journal of Fluid Mechanics , Volume 1015 , 25 July 2025 , A28
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Copyright
© The Author(s), 2025. Published by Cambridge University Press

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