Dynamic transitions of the magnetized spherical Couette flow between its base state and the return flow instability

The transition between the stable base state of the magnetized spherical Couette (MSC) flow and the return flow instability is experimentally investigated. The experiments are conducted using an MSC setup consisting of insulating spheres with the ratio of the inner to the outer radii r i / r o = 0.5...

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Bibliographic Details
Published in:IOP conference series. Materials Science and Engineering 2022-01, Vol.1223 (1), p.12004
Main Authors: Ogbonna, J, Garcia, F, Gundrum, T, Seilmayer, M, Stefani, F
Format: Article
Language:English
Subjects:
Couette flow
Flow stability
Fluid flow
Hartmann number
Insulation
Power spectra
Return flow
Reynolds number
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Summary:The transition between the stable base state of the magnetized spherical Couette (MSC) flow and the return flow instability is experimentally investigated. The experiments are conducted using an MSC setup consisting of insulating spheres with the ratio of the inner to the outer radii r i / r o = 0.5, Reynolds number Re = 1000 and Hartmann number Ha ∈ [25, 29]. The transition is characterized by changes in the power spectra of the azimuthal modes in the flow as Ha is dynamically changed. The transition occurs in the interval Ha ∈ [26.5, 27.5]. The evolution of the power spectra of the azimuthal modes exhibits hysteretic effect depending on whether Ha is increased or decreased within the experimental interval. The power spectra in the azimuthal modes m ∈ {3, 4} increases and remains dominant as Ha is increased, while the power spectra in m ∈ {2, 4} are dominant while the flow is time dependent due to return flow instability as Ha is decreased.
ISSN:1757-8981
1757-899X
DOI:10.1088/1757-899X/1223/1/012004