Stability of two flowing coaxial ferrofluid annuli
File(s)
Accepted version
Author(s)
Ferguson Briggs, Sarah
Blyth, Mark
Mestel, Andrew
Type
Journal Article
Abstract
Two concentric ferrofluid annuli fill the gap between two concentric cylinders. In a stationary state without magnetic field, the interface between the fluids is unstable to
surface tension. However, this instability can be controlled either by axial motion if the fluids have different viscosity, or by passing a current down the inner cylinder if the inner
fluid has a higher magnetic susceptibility. If the susceptibilities differ, an axial magnetic field may also grant stability to all but the longest wavelengths. Each of these mechanisms can, however, give rise to other instabilities. This paper investigates the linear stability to arbitrary disturbances of the combination of shear and magnetic effects.
surface tension. However, this instability can be controlled either by axial motion if the fluids have different viscosity, or by passing a current down the inner cylinder if the inner
fluid has a higher magnetic susceptibility. If the susceptibilities differ, an axial magnetic field may also grant stability to all but the longest wavelengths. Each of these mechanisms can, however, give rise to other instabilities. This paper investigates the linear stability to arbitrary disturbances of the combination of shear and magnetic effects.
Date Issued
2025-03-01
Date Acceptance
2025-01-28
Citation
Magnetohydrodynamics, 2025, 61 (1-2), pp.129-137
ISSN
0024-998X
Publisher
Institute of Physics, University of Latvia
Start Page
129
End Page
137
Journal / Book Title
Magnetohydrodynamics
Volume
61
Issue
1-2
Copyright Statement
© 2025 Institute of Physics, University of Latvia.
Publication Status
Published