Journal ArticleDOI
Hydromagnetic stability of current-induced flow in a small gap between concentric rotating cylinders
Min-Hsing Chang,Ch'o–Kuang Chen +1 more
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TLDR
In this paper, the stability analysis of the flow of a viscous electrically conducting fluid between concentric rotating cylinders in the presence of an axial magnetic field is extended to the case where the primary flow includes a pressure gradient acting in the azimuthal direction.Abstract:
The stability analysis of the flow of a viscous electrically conducting fluid between concentric rotating cylinders in the presence of an axial magnetic field is extended to the case where the primary flow includes a pressure gradient acting in the azimuthal direction. The pressure gradient is produced electromagnetically by the interaction of a superimposed radial current and the uniform axial magnetic field. The assumption of small gap approximation is made and the governing equations with respect to both axisymmetric and non–axisymmetric three–dimensional disturbances are derived and solved by a direct numerical procedure. A parametric study covering wide ranges of Q , the Hartmann number which represents the strength of axial magnetic field, and β, a parameter characterizing the ratio of current induced and rotation velocities, is conducted for weakly conducting cylinders and the situation of practical interest where the outer cylinder is stationary and the inner cylinder is rotating. The area where the onset mode is non–axisymmetric is shown in the plane β, Q ). It is found that the most stable state occurs approximately along a critical curve (β + 4.3) Q 2 + 56250(β + 3.75) = 0 and the critical axial wavenumber always has discontinuity when the parameters Q and β cross this curve. The critical mode transition of the onset of instability will be demonstrated in detail and results for the critical wavenumber and the critical Taylor number are presented. The corresponding values of the radial current density required for the appearance of secondary flow are also determined.read more
Citations
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Journal ArticleDOI
Weakly Nonlinear Stability Analysis of a Thin Magnetic Fluid during Spin Coating
Cha'o-Kuang Chen,Dong-Yu Lai +1 more
TL;DR: In this paper, a generalized nonlinear kinematic model is derived by the long-wave perturbation method to represent the physical system, and the method of normal mode is applied to study the linear stability.
Journal ArticleDOI
Stability of narrow-gap Taylor-Dean flow with radial heating: Stationary critical modes
Rudra Kanta Deka,Ashish Paul +1 more
TL;DR: In this paper, a linear stability analysis for the Taylor-Dean flow, a viscous flow between concentric horizontal cylinders with a constant azimuthal pressure gradient, keeping the cylinders at different temperatures, when the inner cylinder is rotating and outer one is stationary has been implemented under the assumption that the gap spacing between the cylinders is small compared to the mean radius.
Journal ArticleDOI
Analysis of a conducting fluid in a thin annulus with rotating insulated walls under radial magnetic effect
Jenn-Shyang Kuo,Jik Chang Leong +1 more
TL;DR: A theoretical solution for the steady Taylor-Couette flow between two electrically insulated rotating cylinders under the influence of a radial magnetic field is provided in this paper, by solving the appropriate set of governing equations simultaneously, the profiles of fluid tangential velocity component and induced magnetic field were obtained as complicated functions involving the modified Bessel functions in terms of radial coordinates and Hartmann number.
Journal ArticleDOI
Hydromagnetic stability of current-induced flow in a small gap between concentric cylinders
Min-Hsing Chang,Cha'o-Kuang Chen +1 more
TL;DR: In this paper, a linear stability analysis for hydromagnetic current-induced flow was carried out and the assumption of small gap approximation was made and the governing equations with respect to nonaxisymmetric disturbances were derived and solved by a direct numerical procedure.
Journal ArticleDOI
Air-Aided Shear on a Thin Film Subjected to a Transverse Magnetic Field of Constant Strength: Stability and Dynamics
TL;DR: In this article, the effect of air shear on the hydromagnetic instability is studied through linear stability, weakly nonlinear theory, sideband stability of the filtered wave, and numerical integration of the nonlinear equation.
References
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Journal ArticleDOI
On the relative importance of Taylor-vortex and non-axisymmetric modes in flow between rotating cylinders
Journal ArticleDOI
The stability of viscous flow between rotating cylinders in the presence of a magnetic field
TL;DR: In this paper, a variational procedure for solving the underlying characteristic value problem and determining the critical Taylor numbers for the onset of instability is described, and a table of critical Taylor number for various values of Q is provided.
Journal ArticleDOI
The stability of viscous flow between rotating concentric cylinders with a pressure gradient acting round the cylinders
Journal ArticleDOI
Experiments on the stability of flow between rotating cylinders in the presence of a magnetic field
Russell J. Donnelly,M. Ozima +1 more
TL;DR: In this article, the hydromagnetic stability of the flow of mercury between concentric cylinders has been determined by means of a rotating cylinder viscometer, and the results agree with the theoretical predictions of Chandrasekhar (1953) and Niblett (1958) within experimental error.
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