Stability of a ferrofluid layer on a liquid substrate

The stability of a horizontal magnetic fluid layer located on a liquid substrate in the alternating magnetic field orthogonal to the surface is experimentally investigated. Kerosene-based magnetite liquid stabilized with oleic acid (ferrofluid) and perfluorooctane (to create a liquid substrate) were...

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Bibliographic Details
Published in:Journal of physics. Conference series 2021-02, Vol.1809 (1), p.12021
Main Authors: Khokhryakova, C A, Kolesnichenko, E V
Format: Article
Language:English
Subjects:
Critical field (superconductivity)
Diameters
Ferrofluids
Field strength
Free surfaces
Frequency stability
Kerosene
Magnetic fields
Magnetic fluids
Oleic acid
Physics
Resonant frequencies
Substrates
Thickness
Working fluids
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Summary:The stability of a horizontal magnetic fluid layer located on a liquid substrate in the alternating magnetic field orthogonal to the surface is experimentally investigated. Kerosene-based magnetite liquid stabilized with oleic acid (ferrofluid) and perfluorooctane (to create a liquid substrate) were chosen as working fluids. The presence of a free surface and interface in the magnetic fluid layer determines the influence of spatial characteristics of the system, such as the diameter of the cell and the thickness of the liquid layer, on the resonant frequency. The stability of the ferrofluid layer in an orthogonal stationary magnetic field is investigated, and the dependence of the critical field strength on the layer thickness is obtained. The dependences of intensity amplitude on the alternating magnetic field frequency are depicted for the ferrofluid layers of various initial thicknesses. The obtained stability curves show that the low frequency field (1–4 Hz) destabilizes the system, while the high frequency one (from 4 Hz and above) has a stabilizing effect.
ISSN:1742-6588
1742-6596
DOI:10.1088/1742-6596/1809/1/012021