Heat transfer augmentation using a magnetic fluid under the influence of a line dipole

Ganguly, Ranjan; Sen, Swarnendu; Puri, Ishwar K.

doi:10.1016/j.jmmm.2003.09.015

Cited by 198 publications

(90 citation statements)

References 21 publications

(34 reference statements)

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“…A line dipole is placed near the lower wall half way along the channel length, which provides a two-dimensional magnetic field, as described elsewhere. 25,26 The nanoparticle concentration in the ferrofluid is considered small enough for the dipole-dipole interactions to be negligible ͑since the largest volume fraction of the particles is 3%͒. Therefore, Langevin's theory 27 can describe the fluid magnetization sufficiently accurately.…”

Section: Simulationsmentioning

confidence: 99%

A strategy for the assembly of three-dimensional mesoscopic structures using a ferrofluid

2005

Self Cite

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A novel technique for the self-assembly of three-dimensional mesoscopic structures in a forced fluid flow by employing a magnetic field is described. There are advantages of using magnetic fields for this purpose: unlike many other forces, a magnetic force is effective even from a distance, permitting “action at a distance,” it is also localized, and competition between the magnetic force and fluid shear enables unique self-assembled ferrofluid structures. Herein, a simulation provides insight into the possibility of using magnetic field to assemble colloidal nanoparticles into aggregates. Subsequently, a demonstration experiment is conducted to characterize the development and decay of such aggregates. The analysis provides a basis for developing effective self-assembly techniques for various engineering applications.

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Section: Simulationsmentioning

confidence: 99%

A strategy for the assembly of three-dimensional mesoscopic structures using a ferrofluid

2005

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“…where K = −(∂M/∂T ) H is the pyromagnetic coefficient, χ r = (∂M/∂H) T is the differential magnetic susceptibility of the fluid (Ganguly et al [2]), M and H are the equilibrium values around which linearization is preformed and T 0 is the reference temperature. The pyromagnetic coefficient depends on the thermal disorientating motion of magnetic nanoparticles, thermal dependence of magnetic moment, m p of particles and thermal expansion of the fluid.…”

Section: Governing Equationsmentioning

confidence: 99%

Simulation of ferrofluids by BEM

Ravnik¹,

Škerget²

2012

WIT Transactions on Modelling and Simulation

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In this paper the Boundary element method (BEM) was applied to simulate viscous flow of ferrofluids under the influence of a homogenous external magnetic field. We present a derivation of the boundary integral form of the vorticity transport equation, which includes magnetic body force terms. Furthermore, discretization and numerical solution of the coupled flow and heat transfer problems are presented.The derived numerical model has been used to study the effect of a homogenous external magnetic field on the natural convection of ferrofluids in a differentially heated enclosure. We established that the effects are negligible for magnetic Rayleigh numbers less or equal to the flow Rayleigh number. On the other hand, the magnetic body force changes the flow field significantly and contributes to the instability of the flow.

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“…Neuringer [2] simulated the effects of external magnetic field on two dimensional stagnation point flow of a heated ferrofluid against a cold wall and the two dimensional parallel flow along a wall with linearly decreasing surface temperature. Ganguly et al [3] investigated the flow of hot ferrofluid in a channel. He considercold wall which is under the influence of a line source dipole.…”

Section: Introductionmentioning

confidence: 99%

Non Darcy Mixed Convection Flow of Magnetic Fluid over a Permeable Stretching Sheet with Ohmic Dissipation

Zeeshan¹,

Majeed²

2016

Journal of Magnetics

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This paper aims to discuss the Non Darcy boundary layer flow of non-conducting viscous fluid with magnetic ferroparticles over a permeable linearly stretching surface with ohmic dissipation and mixed convective heat transfer. A magnetic dipole is applied "a" distance below the surface of stretching sheet. The governing equations are modeled. Similarity transformation is used to convert the system of partial differential equations to a system of non-linear but ordinary differential equations. The ODEs are solved numerically. The effects of sundry parameters on the flow properties like velocity, pressure, skin-friction coefficient and Nusselt number are presented. It is deduced the frictional resistance of Lorentz force decreases with stronger electric field and the trend reverses for temperature. Skin friction coefficient increase with increase in ferromagnetic interaction parameter. Whereas, Nusselt number decrease.

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Heat transfer augmentation using a magnetic fluid under the influence of a line dipole

Cited by 198 publications

References 21 publications

A strategy for the assembly of three-dimensional mesoscopic structures using a ferrofluid

A strategy for the assembly of three-dimensional mesoscopic structures using a ferrofluid

Simulation of ferrofluids by BEM

Non Darcy Mixed Convection Flow of Magnetic Fluid over a Permeable Stretching Sheet with Ohmic Dissipation

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