Novel properties and applications in magnetic fluids

Horng, Herng-Er; Hong, Chin Yih; Yang, Shieh‐Yueh; Yang, Hong-Chang

doi:10.1016/s0022-3697(01)00108-1

Cited by 84 publications

(45 citation statements)

References 53 publications

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“…The ferrofluid generally consisted of magnetite nanosized particle of around 1 to 100 nm and carrier liquid such as water, oils, and hydrocarbons with the aid of surfactants in a continuous carrier phase. It can be controlled by both magnitude and direction of an external magnetic field and temperature [1][2][3][4][5][6][7][8][9][10][11][12]. In addition, because of the nanosized magnetic particles consisting of the ferrofluids and the surfactant attached to magnetic particles, the ferrofluid could be prevented from particles sticking to each other or precipitate with Brownian motion [2].…”

Section: Introductionmentioning

confidence: 99%

“…In addition, because of the nanosized magnetic particles consisting of the ferrofluids and the surfactant attached to magnetic particles, the ferrofluid could be prevented from particles sticking to each other or precipitate with Brownian motion [2]. Therefore, the ferrofluid could be applied for various industrial fields: enhancement and depression of the heat transfer of the thermal devices, magnetic sealing, damping and bearing of machines, energy conversion system, drug delivery for disease curing, optical devices, micro-/nanofluidic devices, and so forth [3][4][5].…”

Section: Introductionmentioning

confidence: 99%

“…Horng et al [3] reported the structural pattern formation of the magnetic columns in the ferrofluid thin film under magnetic fields and framework of the application of the ferrofluid based on the remarkable optical properties caused by these magnetically induced structures. Wang et al [6] studied the effects of magnetic force on the natural convection in porous enclosure under magnetic field.…”

Section: Introductionmentioning

confidence: 99%

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Numerical Investigation on Heat and Flow Characteristics of Temperature-Sensitive Ferrofluid in a Square Cavity

Lee

Seo

2013

Advances in Mechanical Engineering

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The objective of this paper is numerically to study the heat and flow characteristics of temperature-sensitive ferrofluid in the square cavity with and without the magnetic intensity. The numerical model was developed to predict the behavior of the ferrofluid using finite element method (FEM) and showed good agreement with the existing data within 5% at all Rayleigh number ranges from 10 3 to 10 6 . Natural convection and heat transfer characteristics of the ferrofluids within the tested cavity were found to depend on both magnetic intensity and magnetic volume fractions of magnetite. In addition, the mean Nusselt numbers and mean velocity of the ferrofluid in a square cavity were increased with the rise of the magnetic intensities and increased by 23.2% and 143.7%, respectively, at both magnetic intensity of H = 10000 A/m and elapsed time of t = 30000 seconds.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Numerical Investigation on Heat and Flow Characteristics of Temperature-Sensitive Ferrofluid in a Square Cavity

Lee

Seo

2013

Advances in Mechanical Engineering

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“…Numerous scientific articles on the thermo-physical characteristics of the ferrofluids in the cavities as basic and fundamental research topics have been published in the open literature for a long time. A ferrofluid is a kind of nanofluid and it has been researched as a novel cooling material to facilitate better heat transfer for better energy savings and longer lifetime of electronics with high heat fluxes [1][2][3][4][5][6][7]. The basic and applicable characteristics of ferrofluids as working fluids have also been studied and discussed in the open literature for a long time.…”

Section: Introductionmentioning

confidence: 99%

Thermophysical Characteristics of the Ferrofluid in a Vertical Rectangle

Seo

You

Kwen

et al. 2015

Entropy

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Abstract:The article aimed to analytically investigate the thermophysical behaviors of a ferrofluid in a vertical rectangle with the variation of intensity of the magnetic field, viscosity of the ferrofluid and boundary conditions. The governing equations of the ferrofluid include the continuity, momentum and energy equations for describing the thermal-fluidic behaviors of the ferrofluid and the Maxwell equation and magnetization equation are also added to consider rotating effect of the nano-sized particles. The flow behavior and heat transfer characteristics of the ferrofluid with the intensity of the magnetic field, viscosities of the ferrofluid and boundary conditions were analyzed through isotherms, velocity profiles and both mean and local Nusselt numbers. As a result, the isotherms of the ferrofluid in the vertical rectangle increased with the increase of the magnetic volume fractions and magnetic field intensities. In addition, the mean Nusselt numbers increased with the increase of magnetite volume fractions at all magnetic field intensities because of the combined effects of both heat conduction by magnetite and the magnetic volume force.

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“…The difference in speed and absorption gives rise to linear birefringence and dichroism. These properties dictate the usefulness of these materials for probable applications in devices such as light-intensity modulator, magnetic-fieldcontrolled switches and magnetic-field-induced gratings [8].…”

Section: Introductionmentioning

confidence: 99%

Enhanced shape anisotropy and magneto-optical birefringence by high energy ball milling in NixFe1−xFe2O4 ferrofluids

Nair

Xavier

Joy

et al. 2008

Journal of Magnetism and Magnetic Materials

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Ferrofluids belonging to the series Ni x Fe 1Àx Fe 2 O 4 were synthesised by two different procedures-one by standard co-precipitation techniques, the other by co-precipitation for synthesis of particles and dispersion aided by high-energy ball milling with a view to understand the effect of strain and size anisotropy on the magneto-optical properties of ferrofluids. The birefringence measurements were carried out using a standard ellipsometer. The birefringence signal obtained for chemically synthesised samples was satisfactorily fitted to the standard second Langevin function. The ball-milled ferrofluids showed a deviation and their birefringence was enhanced by an order. This large enhancement in the birefringence value cannot be attributed to the increase in grain size of the samples, considering that the grain sizes of sample synthesised by both modes are comparable; instead, it can be attributed to the lattice strain-induced shape anisotropy(oblation) arising from the high-energy ball-milling process. Thus magnetic-optical (MO) signals can be tuned by ball-milling process, which can find potential applications. r

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Novel properties and applications in magnetic fluids

Cited by 84 publications

References 53 publications

Numerical Investigation on Heat and Flow Characteristics of Temperature-Sensitive Ferrofluid in a Square Cavity

Numerical Investigation on Heat and Flow Characteristics of Temperature-Sensitive Ferrofluid in a Square Cavity

Thermophysical Characteristics of the Ferrofluid in a Vertical Rectangle

Enhanced shape anisotropy and magneto-optical birefringence by high energy ball milling in NixFe1−xFe2O4 ferrofluids

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