On the similarity between gravity and magneto-gravity convection within a non-electroconducting fluid in a differentially heated rectangular cavity

Khaldi, Fouad; Noudem, Jacques; Gillon, Pascale

doi:10.1016/j.ijheatmasstransfer.2004.10.007

Cited by 17 publications

(7 citation statements)

References 15 publications

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“…Taking into account only the paramagnetic susceptibility of oxygen, we consider two mechanisms able to set in a combustion system: the attraction by the magnetic force toward the high-induction field and the thermomagnetic convection phenomena. Thermomagnetic convection is described in Khaldi et al (2005) as being driven in a volume differentially heated by a magnetic force acting on a paramagnetic medium, for which magnetic susceptibility decreases with temperature. Many papers referred to magnetic influence on combustion.…”

Section: Introductionmentioning

confidence: 99%

Methane/Air-Lifted Flames in Magnetic Gradients

Gillon

Blanchard

Gilard

2010

Combustion Science and Technology

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The authors analyzed the behavior of a laminar CH 4 /air flame with a central methane jet and surrounding air jet in a large range of fuel and air flow rates. Different regimes of flame stability are observed from an anchored flame to a stable lifted flame, which is destabilized before extinction. It is shown that the flame instabilities are coupled to the production of vortices on the air jet/ambient air side and is depending on the injected air velocity. Influence of an upward increasing magnetic field is studied by setting the flame inside the bore of an electromagnet. Measurements at different values of methane and air flow rates show that the flame liftoff height is decreased by the magnetic gradient. It is attributed to the magnetic force, which develops on air via its action with paramagnetic oxygen. The magnetic force interacts with the air jet structures and influences the flame stability.

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Section: Introductionmentioning

confidence: 99%

Methane/Air-Lifted Flames in Magnetic Gradients

Gillon

Blanchard

Gilard

2010

Combustion Science and Technology

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“…In order to enhance magnetization, a strong nonuniform vertical magnetic field created by a superconducting magnet was used in experiments with a paramagnetic vertical fluid layer reported in Ref. 27. While in this case the magnetic effects were comparable in magnitude to gravitational effects, their influence on fluid motions was found to be qualitatively similar to that arising due to normal buoyancy.…”

Section: Introductionmentioning

confidence: 99%

Thermomagnetic convection in a vertical layer of ferromagnetic fluid

Suslov¹

2008

Physics of Fluids

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Linear stability of convection flow of ferromagnetic fluid between two vertical differentially heated plates placed in a uniform external magnetic field perpendicular to the plates is studied. Complete stability diagrams for two-and three-dimensional disturbances are presented. It is shown that two distinct mechanisms, thermogravitational and magnetic, are responsible for the appearance of three instability modes. The physical nature of all three modes is investigated in detail and the most prominent features are identified to provide guidance for future experimental investigation. Depending on the governing parameters, the instability patterns are shown to consist of vertical stationary magnetoconvection rolls and/or vertically or obliquely counterpropagating thermogravitational or thermomagnetic waves.

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“…In order to take into account the magnetic buoyancy effect, we proposed to modify the Froude number as described in Khaldi et al (2005), by replacing g by G.g, where G = 1 + α α−1 g mo g , in which g mo = χ μ 0 B dB dx . The coefficient G measures the artificial gravity introduced by the magnetic fields relatively to g.…”

Section: Resultsmentioning

confidence: 99%

“…Consequently, at the exit of the burner, air is pushed downward by the magnetic force. In addition to this effect, a magneto convection may be driven when the distribution of the magnetic susceptibility in the fluid is non-uniform as demonstrated in Khaldi et al (2005). Table 3.…”

Section: Flow Configuration and Numerical Methodsmentioning

confidence: 99%

Lengths of Lifted Laminar Flames Under Vertical Magnetic Field Gradient

Sarh

Gillon

Gilard

et al. 2014

Combustion Science and Technology

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The effect of a vertical magnetic field gradient on stoichiometric lengths of methane-air diffusion lifted flames was numerically investigated. The study was developed for understanding the evolution of these lengths when coaxial jet air velocity was varied keeping constant fuel velocity. As the air jet velocity is increased, gradient in mixture fraction and liftoff height increase and flame length decreases. Calculated reacting flow results of liftoff and flame length are presented for two cases, with and without magnetic field. For the same initial flow conditions, the application of the negative magnetic field gradient results in an increase of the stoichiometric flame lengths and a reduction of liftoff heights. For the lifted flame under magnetic field gradient, the Froude number was modified to take into account the magnetic buoyancy effect and it is shown that the correlation proposed by Altenkirch et al. (1976) can still be applied to represent lengths of lifted flames.

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On the similarity between gravity and magneto-gravity convection within a non-electroconducting fluid in a differentially heated rectangular cavity

Cited by 17 publications

References 15 publications

Methane/Air-Lifted Flames in Magnetic Gradients

Methane/Air-Lifted Flames in Magnetic Gradients

Thermomagnetic convection in a vertical layer of ferromagnetic fluid

Lengths of Lifted Laminar Flames Under Vertical Magnetic Field Gradient

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