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• W2963304843 abstract "It is demonstrated that the azimuthal magnetorotational instability (AMRI) also works with radially increasing rotation rates contrary to the standard magnetorotational instability for axial fields which requires negative shear. The stability against non-axisymmetric perturbations of a conducting Taylor–Couette flow with positive shear under the influence of a toroidal magnetic field is considered if the background field between the cylinders is current free. For small magnetic Prandtl number $Pmrightarrow 0$ the curves of neutral stability converge in the (Hartmann number,Reynolds number) plane approximating the stability curve obtained in the inductionless limit $Pm=0$ . The numerical solutions for $Pm=0$ indicate the existence of a lower limit of the shear rate. For large $Pm$ the curves scale with the magnetic Reynolds number of the outer cylinder but the flow is always stable for magnetic Prandtl number unity as is typical for double-diffusive instabilities. We are particularly interested to know the minimum Hartmann number for neutral stability. For models with resting or almost resting inner cylinder and with perfectly conducting cylinder material the minimum Hartmann number occurs for a radius ratio of $r_{text{in}}=0.9$ . The corresponding critical Reynolds numbers are smaller than $10^{4}$ ." @default.
• W2963304843 created "2019-07-30" @default.
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• W2963304843 date "2018-01-25" @default.
• W2963304843 modified "2023-09-25" @default.
• W2963304843 title "Azimuthal magnetorotational instability with super-rotation" @default.
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• W2963304843 doi "https://doi.org/10.1017/s0022377818000065" @default.
• W2963304843 hasPublicationYear "2018" @default.
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