Thermal convection in a ferrofluid supported by thermodiffusion

Odenbach, Stefan; Völker, Th.

doi:10.1016/j.jmmm.2004.11.036

Cited by 12 publications

(5 citation statements)

References 4 publications

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“…Other effects, such as the buoyancy-surface tension effects, non-uniform thermal gradients, magnetization constitutive equations, etc., have also been studied in Refs. [32][33][34][35][36][37][38].…”

Section: Introductionmentioning

confidence: 99%

Thermal convection thresholds in a Oldroyd magnetic fluid

Pérez

Bragard

Laroze

et al. 2011

Journal of Magnetism and Magnetic Materials

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Section: Introductionmentioning

confidence: 99%

Thermal convection thresholds in a Oldroyd magnetic fluid

Pérez

Bragard

Laroze

et al. 2011

Journal of Magnetism and Magnetic Materials

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“…Schwab et al [8] implemented the experiment suggested and confirmed the pioneer predictions [7]. Generalizations and extensions of the theoretical model [7] may be found in [9][10][11][12][13][14][15][16] to name a few. The TMC in cavities has been studied both numerically and experimentally in magnetic fields created and controlled by various sources.…”

Section: Introductionmentioning

confidence: 80%

Thermomagnetic convection of a magnetic nanofluid influenced by a magnetic field

Bouhrour

Kalache

2017

THERM SCI

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We present a numerical study of thermomagnetic convection in a differentially heated cavity. The magnetic nanofluid (ferrofluid) is subjected to a uniform magnetic gradient oriented at an angle, φ, with respect to the thermal gradient. The motivation for this work stems largely from a desire to extent preexisting works focused on horizontal and vertical orientations φ = 0°, 90°, 180°, and 270°. Our main goal is to get data on the flow and heat transfer for any orientation in the entire range 0-360°. The generalized problem lends itself to the investigation of orientations that give maximum heat transfer. It is found that, (1) at a given magneto-gravitational coupling number, N, orientations 0°, 90°, and 270°, for which magnetization gradient is unstable, are not the optimum ones, (2) for 0 < N ≤ 1, heat transfer reaches a maximum between 270° and 360°, (3) for N > 1, a second maximum occur between 0° and 90° owing to reverse flow phenomenon, (4) at strong magnetic gradients, the two heat transfer peaks take the same value, and (5) optimization parameter, ω, reflecting the strongest magnetic effect, grows with N. Unlike the gravity, magnetic gradient may supply various strengths and spatial configurations, which makes thermomagnetic convection more controllable. Also, the magnetic mechanism is a viable alternative for the gravity one in microgravity, where thermo-gravitational convection ceases to be efficient.

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“…The general interaction between thermodiffusion and convection in ferrofluids has already been proofed experimentally in zero magnetic field in [12]. Therefore, further investigations on that subject including magnetic fields as described in the following are of high interest.…”

Section: Introductionmentioning

confidence: 83%

Thermodiffusion in ferrofluids regarding thermomagnetic convection

Sprenger

Lange

Odenbach

2013

Comptes Rendus. Mécanique

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Magnetic fluids, also called ferrofluids, are binary liquids consisting of magnetic nanoparticles being dispersed in a carrier liquid. They show very strong thermodiffusive behaviour with a Soret coefficient (S T ) of approximately 0.16 K −1 without a magnetic field. The dependence of the Soret coefficient on a magnetic field can lead to even higher values, and to a change in the coefficient's sign. This change in the direction of movement of the nanoparticles strongly affects the onset of thermomagnetic convection. A linear stability analysis reveals that thermodiffusion with a positive sign of the Soret coefficient enhances the onset of convection, whereas negative coefficients starting at about −0.001 K −1 suppress convection at all.

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Thermal convection in a ferrofluid supported by thermodiffusion

Cited by 12 publications

References 4 publications

Thermal convection thresholds in a Oldroyd magnetic fluid

Thermal convection thresholds in a Oldroyd magnetic fluid

Thermomagnetic convection of a magnetic nanofluid influenced by a magnetic field

Thermodiffusion in ferrofluids regarding thermomagnetic convection

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