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Instability of the miscible magnetic/non-magnetic fluid interface

Published online by Cambridge University Press:  03 March 2021

Mikhail S. Krakov Open the ORCID record for Mikhail S. Krakov [Opens in a new window] ,
Arthur R. Zakinyan Open the ORCID record for Arthur R. Zakinyan [Opens in a new window]  and
Anastasia A. Zakinyan Open the ORCID record for Anastasia A. Zakinyan [Opens in a new window]
Mikhail S. Krakov*
Affiliation:
Belarusian National Technical University, 4 Nezavisimosti Ave., Minsk220013, Belarus
Arthur R. Zakinyan
Affiliation:
North-Caucasus Federal University, 1 Pushkin Street, Stavropol355017, Russia
Anastasia A. Zakinyan
Affiliation:
North-Caucasus Federal University, 1 Pushkin Street, Stavropol355017, Russia
*
†Email address for correspondence: [email protected]
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Abstract

The behaviour of the diffusion front of a magnetic fluid in contact with a miscible non-magnetic fluid in a normal magnetic field is studied. It was found that the magnetic field is a cause of the diffusion front bending and its movement accompanied by intense advective flows. These flows lead to the fast growth of the wavy shape of the diffusion front and formation of the peaks. This phenomenon is studied both numerically and experimentally. The reasons for the instability of the diffusion front in a magnetic field are discussed. The influence of the parameters of the problem (Schmidt number, magnetic Rayleigh number, magnetic field, the thickness of the layer, diffusion front width, etc.) on the instability parameters is studied both numerically and experimentally. It is shown that the studied instability differs from Rosensweig's instability.

JFM classification

Interfacial Flows (free surface): Contact lines Interfacial Flows (free surface): Fingering instability MHD and Electrohydrodynamics: Magnetic fluids
Type
JFM Papers
Information
Journal of Fluid Mechanics , Volume 913 , 25 April 2021 , A30
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Copyright
© The Author(s), 2021. Published by Cambridge University Press

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Krakov et al. supplementary movie 1

Animation of the diffusion front instability

Download Krakov et al. supplementary movie 1(Video)
Video 45.1 MB

Krakov et al. supplementary movie 2

Diffusion front instability in the experiment.

Download Krakov et al. supplementary movie 2(Video)
Video 1.3 MB