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 ri/ro = 0.5, Re...
| Autores: | , , , , |
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| Tipo de recurso: | artículo |
| Fecha de publicación: | 2022 |
| País: | España |
| Institución: | Universitat Politècnica de Catalunya (UPC) |
| Repositorio: | UPCommons. Portal del coneixement obert de la UPC |
| Idioma: | inglés |
| OAI Identifier: | oai:upcommons.upc.edu:2117/367318 |
| Acceso en línea: | https://hdl.handle.net/2117/367318 https://dx.doi.org/10.1088/1757-899x/1223/1/012004 |
| Access Level: | acceso abierto |
| Palabra clave: | Fluid dynamics Dinàmica de fluids Àrees temàtiques de la UPC::Enginyeria dels materials |
| Sumario: | 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 ri/ro = 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. |
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