Thermoconvective Stability of a Ferrofluids in Presence of Magnetic Field

Jasmine, H. A.

doi:10.3329/jsr.v8i3.27199

Cited by 3 publications

(2 citation statements)

References 16 publications

(29 reference statements)

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“…We note that if we set  1 = 0 in (26) and  = 0 in (28) and rearrange the terms we recover the equations studied by Finlayson [13]. There are, however, no counterparts to equation (27), the angular momentum equation, and the magnetization equation (29…”

Section: Governing Equationsmentioning

confidence: 83%

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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: Governing Equationsmentioning

confidence: 83%

“…This effect arises due to thermally induced self-diffraction under the influence of gravity and external magnetic field. Recently Jasmine [27] investigated the linear thermoconvective stability of ferrofluid in presence of uniform magnetic field with gravity for rigid-rigid boundary condition case only.…”

Section: Introductionmentioning

confidence: 99%

Rayleigh-Bénard Convection in Ferrofluids in the Microgravity Environment

Jasmine

2016

J. Sci. Res.

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Temperature evolution equation of a compressible turbulent ferrofluid

Mouraya

Banerjee

2023

Physics of Fluids

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A temperature evolution equation for compressible ferrofluids is derived using basic laws of thermodynamics of moving electromagnetic media. Along with the compressibility the change in kinetic energy is also included in the laws of thermodynamics to make the equation suitable for studying convective instabilities and fully developed turbulence in compressible ferrofluids as is shown by an order of magnitude analysis. The derived equation is found to be consistent with the total energy conservation when the forcing and dissipative effects are neglected. One can indeed recover the previously derived temperature evolution equations under suitable limits. In hydrodynamic limit, the equation is reduced to the temperature evolution of a neutral compressible fluid and can be potentially important for studying astrophysical turbulence.

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High Dielectric Constant Liquid Dielectrics Based on Magnetic Nanofluids

Biju

Joseph²,

Archana

et al. 2023

j nanofluids

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Magnetic nanofluids are increasingly finding new applications. They can be employed as liquid dielectrics. The advantage of having a liquid dielectric is that high dielectric constant can be achieved by a judicious choice of the base liquid. The dielectric constant can be tuned with the help of an external magnetic field too. Superparamagnetic iron oxide nanoparticles were dispersed in polar carriers, namely water, polyvinyl alcohol, ethylene glycol, and a nonpolar carrier like kerosene to obtain stable magnetic fluids after ensuring the crystallographic phase purity along with appropriate magnetic characteristics of the dispersant. The fluids were then subjected to dielectric studies using an automated homemade dielectric setup. The dielectric permittivity and dielectric loss at different frequencies with and without an external magnetic field were evaluated. The studies indicate that magnetic nanofluids based on polar carriers are excellent liquid dielectrics over a wide range of frequencies with the incorporation of iron oxide nanoparticles. The application of an external magnetic field enhances the dielectric constant considerably. These magnetic nanofluids can be employed as liquid dielectrics for applications. It has been found that kerosene based magneto fluids have a low dielectric constant while Polyvinyl alcohol based fluids exhibit the highest dielectric constant.

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Thermoconvective Stability of a Ferrofluids in Presence of Magnetic Field

Cited by 3 publications

References 16 publications

Rayleigh-Bénard Convection in Ferrofluids in the Microgravity Environment

Rayleigh-Bénard Convection in Ferrofluids in the Microgravity Environment

Temperature evolution equation of a compressible turbulent ferrofluid

High Dielectric Constant Liquid Dielectrics Based on Magnetic Nanofluids

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