Interaction of gravitational and magnetic mechanisms of convection in a vertical layer of a magnetic fluid

Suslov, Sergey A.; Bozhko, A. D.; Putin, G. F.; Sidorov, A. S.

doi:10.1016/j.phpro.2010.11.038

Cited by 6 publications

(8 citation statements)

References 3 publications

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“…At the same time such a delay (up to Gr ≈ 15.023) in the vertical alignment of the Type I instability patterns is most evident for the field orientation angles in the range 0 • < γ < 90 • (see the maximum of the solid curve marked by the square in figure 16a). Therefore we conclude that the orientation of the applied magnetic field can have a profound influence on the type of the observed convection patterns, which indeed has been observed near the edges of the ferrofluid layer, where the field inclination is essential and unavoidable, in experiments reported in Suslov et al (2010Suslov et al ( , 2012.…”

Section: Arbitrary Field Orientationsupporting

confidence: 59%

“…Therefore stationary vertical thermo-magnetic rolls are expected to dominate the overall disturbed flow. Yet the presence of the Type I and III instabilities should be visible experimentally as non-stationary three-dimensional modulations of vertical rolls, which has indeed been detected in experiments reported in Suslov et al (2010Suslov et al ( , 2012.…”

Section: Field Inclined In the Plane Containing The Main Periodicity mentioning

confidence: 55%

“…To compare the behaviour of fluids with different thermo-magnetic sensitivities the results are reported for the representative magnitudes of the non-dimensional external magnetic field H e = 100 and H e = 10. The first value corresponds to the experimental conditions of Suslov et al (2010Suslov et al ( , 2012, Bozhko et al (2013) and Sidorov (2016), while the second is chosen consistently with Rahman & Suslov (2015) to highlight the effects caused by the nonlinearity of magnetic field within the fluid layer.…”

Section: Problem Formulation and Governing Equationsmentioning

confidence: 99%

“…The magnetic field lines necessarily curve near the non-magnetic walls of the container that separate ferromagnetic medium from surroundings (the magnetic field is 'sucked into' a ferrofluid layer through its edges). Experiments reported in Suslov et al (2010Suslov et al ( , 2012 show that the influence of such edge effects can extend far into the ferrofluid layer, so that they cannot be fully ignored.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Magneto-gravitational convection in a vertical layer of ferrofluid in a uniform oblique magnetic field

Rahman

Suslov

2016

J. Fluid Mech.

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The stability of base gravitational convection in a layer of ferrofluid confined between two vertical wide and tall non-magnetic plates, heated from one side, cooled from the other and placed in a uniform oblique external magnetic field is studied. Two distinct mechanisms, thermo-gravitational and thermo-magnetic, are found to be responsible for the appearance of various stationary and wave-like instability modes. The characteristics of all instability modes are investigated as functions of the orientation angles of the applied magnetic field and its magnitude for various values of magnetic parameters when both the thermo-magnetic and gravitational buoyancy mechanisms are active. The original three-dimensional problem is cast in an equivalent two-dimensional form using generalised Squire's transformations, which significantly reduces a computational cost. Subsequently, full three-dimensional instability patterns are recovered using the inverse Squire's transformation, and the optimal field and pattern orientations are determined.

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Section: Arbitrary Field Orientationsupporting

confidence: 59%

Section: Field Inclined In the Plane Containing The Main Periodicity mentioning

confidence: 55%

Section: Problem Formulation and Governing Equationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Magneto-gravitational convection in a vertical layer of ferrofluid in a uniform oblique magnetic field

Rahman

Suslov

2016

J. Fluid Mech.

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“…Zebib 1996;Tagg & Weidman 2007;Altmeyer et al 2010). However as mentioned in Suslov et al (2010) experimental implementation of such a geometry is somewhat more complicated and the magnetic field applied in this case is necessarily non-uniform, which complicates the understanding of basic thermomagnetic mechanisms that are of interest here.…”

Section: Introductionmentioning

confidence: 99%

Thermomagnetic convection in a layer of ferrofluid placed in a uniform oblique external magnetic field

Rahman

Suslov

2015

J. Fluid Mech.

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Linear stability of magnetoconvection of a ferromagnetic fluid contained between two infinite differentially heated non-magnetic plates in the presence of an oblique uniform external magnetic field is studied in zero gravity conditions. The thermomagnetic convection that arises is caused by the spatial variation of magnetisation occurring due to its dependence on the temperature. The critical values of the governing parameters at which the transition between motionless and convective states is observed are determined for various field inclination angles and for fluid magnetic parameters that are consistently chosen from a realistic experimental range. It is shown that, similar to natural paramagnetic fluids, the most prominent convection patterns align with the in-layer component of the applied magnetic field but in contrast to such paramagnetic fluids the instability patterns detected in ferrofluids can be oscillatory. It is also found that, contrary to paramagnetic fluids, the stability characteristics of magnetoconvection in ferrofluids depend on the magnitude of the applied field which becomes an additional parameter of the problem. This is shown to be due to the nonlinearity of the magnetic field distribution within the ferrofluid.

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Colloidal Energetic Systems

Chiolerio

Quadrelli

2019

Energy Tech

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Colloidal devices—in the liquid state—possibly protected from harsh planetary environments by a soft protective deformable skin, represent a totally new paradigm in the field of robotics. They include the autonomy features of conventional robotics and the shape‐changing advantages of soft robotics and offer new opportunities to science and technology. For these systems, energy management is considered to be the most essential function to guarantee autonomy and operation. Herein, smart fluids as autonomous systems with energy‐harvesting/storage capabilities are described and an initial assessment of existing possibilities that can be leveraged to pursue the emerging topic of colloidal autonomous systems is provided.

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Interaction of gravitational and magnetic mechanisms of convection in a vertical layer of a magnetic fluid

Cited by 6 publications

References 3 publications

Magneto-gravitational convection in a vertical layer of ferrofluid in a uniform oblique magnetic field

Magneto-gravitational convection in a vertical layer of ferrofluid in a uniform oblique magnetic field

Thermomagnetic convection in a layer of ferrofluid placed in a uniform oblique external magnetic field

Colloidal Energetic Systems

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