Thermal convection thresholds in a Oldroyd magnetic fluid

Pérez, Laura M.; Bragard, J.; Laroze, David; Martínez-Mardones, J.; Pleiner, Harald

doi:10.1016/j.jmmm.2010.10.022

Cited by 28 publications

(13 citation statements)

References 69 publications

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“…The last two references also have discussed the weakly nonlinear analysis. Some other aspects of the thermal convection problem in the above model have also been considered by Pérez et al [20]. Finally, we point out that some interesting aspects of the convection problem in an oscillatory magnetic field have also been studied by Kaloni and Lou [21] and Matura and Lücke [22].…”

Section: Introductionsupporting

confidence: 60%

Rayleigh-Bénard Convection in Ferrofluids in the Microgravity Environment

Jasmine

2016

J. Sci. Res.

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We have investigated stability of a ferrofluid in microgravity environment. We consider the effect of the spin viscosity, vortex viscosity, and magnetization relaxation. The eigenvalue problem is solved by employing the Chebyshev pseudospectral method and the results are discussed for all three boundary conditions: free-free, rigid-free and rigid-rigid. In the microgravity environment, the ferrofluid is more resilient to convection and, in general, for all boundary conditions requires higher temperature gradient for the threshold of the convection. It is found that a ferrofluid in microgravity environment is more stable, not only as compared to the case when gravity is present, but also in the pure viscous case.

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Section: Introductionsupporting

confidence: 60%

Rayleigh-Bénard Convection in Ferrofluids in the Microgravity Environment

Jasmine

2016

J. Sci. Res.

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“…In the present paper we have employed the general equations suggested in Rosensweig [6,10]. Some other aspects of the thermal convection problem in the above model have also been considered by Pérez et al [11]. Ghofrani et al [12] investigated experimentally on forced convection heat transfer of an aqueous ferrofluid flow passing through a circular copper tube in the presence of an alternating magnetic field.…”

Section: Introductionmentioning

confidence: 99%

Thermoconvective Stability of a Ferrofluids in Presence of Magnetic Field

Jasmine

2016

J. Sci. Res.

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We have carried out a theoretical analysis of the linear thermoconvective stability of a ferrofluid, which is confined between two horizontal plates maintained at different constant temperatures and which is subject to an external uniform magnetic field in the vertical direction. The effects of the spin viscosity, vortex viscosity and magnetization relaxation are considered and discussed. The eigenvalue problem is solved by employing the Chebyshev pseudospectral method. It is found that the presence of magnetic field complements the buoyancy force in destabilizing the fluid at lower values of the magnetic field only and when the applied field is increased, the effect is reversed and the flow becomes more stable.

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“…As a functional uid material, MF are widely applied in the areas of dampers, lubricating, grinding, vacuum sealing, electric motors, loudspeakers, brakes and so on [1][2][3][4]. The properties of MF, such as saturation magnetization, magneto-viscosity, magneto-optical and thermal effects, were studied in [5][6][7][8][9]. However, as a new functional material, its working mechanism and some properties are still remain unclear.…”

Section: Introductionmentioning

confidence: 99%

Vibration characteristics of armature assembly in a torque motor with magnetic fluids

Han

et al. 2015

2015 International Conference on Fluid Power and Mechatronics (FPM)

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Attempting to suppress high frequency resonant vibrations of a hydraulic servo-valve torque motor, vibration characteristics of armature assembly in the torque motor with and without magnetic fluids are studied in this paper. The mathematical model of the resistance force that the magnetic fluids acts on the armature is established. The equivalent physical model of magnetic fluids which is taken as a spring and a damper, is studied according to the relationship between the resistance force and the squeezing displacement of the armature. The finite element models of armature assembly in torque motor with and without magnetic fluids are established. The FFT transformation of harmonic responses at the end of feedback rod with and without magnetic fluids are compared under the excitation of electromagnetic force. Both simulation and experimental studies have shown that high-frequency self-excited vibrations of a torque motor are suppressed significantly after adding the magnetic fluids into the working gaps. So it is of great benefit for the mechanism revealing of high frequency self-excited vibrations, and improving the overall performance of the servo-valves.

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Thermal convection thresholds in a Oldroyd magnetic fluid

Cited by 28 publications

References 69 publications

Rayleigh-Bénard Convection in Ferrofluids in the Microgravity Environment

Rayleigh-Bénard Convection in Ferrofluids in the Microgravity Environment

Thermoconvective Stability of a Ferrofluids in Presence of Magnetic Field

Vibration characteristics of armature assembly in a torque motor with magnetic fluids

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