Numerical Investigation of the Transient Hydrothermal Behavior of a Ferrofluid Flowing Through a Helical Duct in the Presence of Nonuniform Magnetic Field

Aminfar, Habib; Mohammadpourfard, Mousa; Zonouzi, Sajjad Ahangar

doi:10.1115/1.4026487

Cited by 14 publications

(4 citation statements)

References 23 publications

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“…Aminfar et al [3] numerically examined the hydrothermal behaviour of water-based ferrofluid flowing through a helical channel using the CV technique. Transverse magnetic field was applied to the channel and increase in the flow rate and velocity gradient was observed with augmentation in heat transfer.…”

Section: Shakiba and Vahedimentioning

confidence: 99%

Numerical Simulation of Free Convection Heat Transfer of Ferrofluid in an Oval Shaped Closed Loop

Mehta

Kumar

2018

AJEAT

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Free convective heat transfer capability of kerosene based ferrofluid flowing through an oval shaped two-dimensional closed loop has been investigated numerically. COMSOL Multi Physics, a standard CFD code has been applied for solving the governing equations. A constant magnetic field was applied using permanent magnet and time dependent numerical study has been conducted for laminar fluid flow and heat transfer. The fluid was found to flow under the effect of externally applied magnetic field and spatially varying temperature. Maximum velocity of 4.43 mm/s has been found under the influence of externally applied magnetic field generated by the permanent magnet and flow was observed to be continuous. Temperature and velocity plots have also been plotted reconfirming the candidature of ferrofluid as a coolant for heat transfer applications of mini/micro devices.

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Section: Shakiba and Vahedimentioning

confidence: 99%

Numerical Simulation of Free Convection Heat Transfer of Ferrofluid in an Oval Shaped Closed Loop

Mehta

Kumar

2018

AJEAT

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“…They found that applying a magnetic field leads to the formation of secondary flow and therefore increasing Nusselt number. The same group studied the influence of a transverse magnetic field on the ferrofluid mixed convection in a helical duct [20]. Their numerical results indicated that an applied transverse magnetic field increases the axial velocity of the ferrofluid near the walls, which leads to heat transfer enhancement.…”

Section: Introductionmentioning

confidence: 99%

Numerical study of magnetic field effect on the ferrofluid forced convection and entropy generation in a curved pipe

Soltanipour

Gharegöz

Oskooee

2020

J Braz. Soc. Mech. Sci. Eng.

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This paper presents the effect of a magnetic field on the ferrofluid flow pattern, heat transfer and entropy generation in a curved pipe. A non-uniform magnetic field is applied to ferrofluid (water + 2% vol. Fe 3 O 4 nanoparticles) flow and under the constant heat flux boundary condition. Governing equations are solved by the finite volume method and based on the SIMPLE algorithm. The major objective of this work is to illustrate the effects of circumferential angle (0 • ≤ ≤ 180 •) and strengths of a magnetic field 0 ≤ Mn ≤ 3 × 10 6 on the hydro-thermal behavior and entropy production rate. It is found that circumferential angle of the magnetic source plays an important role in hydro-thermal performance of a curved pipe. At low magnetic numbers, the optimal circumferential location of the magnetic source is opt = 180 • which leads to the maximum heat transfer enhancement and hydro-thermal performance and the minimal entropy generation rate. For high magnetic numbers, the optimal operating condition occurs at = 0 • and = 60 • depending on the magnetic number. Second law analysis reveals that the major source of entropy generation comes from heat transfer irreversibility which reduces significantly by applying a magnetic field. In the range of studied parameters, the maximum heat transfer enhancement is about 29% which occurs at = 0 • and Mn = 3 × 10 6. Keywords Curved pipe • Entropy generation • Ferrofluid • Heat transfer enhancement • Magnetic field List of symbols C Specific heat at constant pressure (Jkg −1 K −1) d p Particle diameter (m) Ec Eckert number (−) H Magnetic field intensity (Am −1) I Electric current (A) K Thermal conductivity (Wm −1 K −1) k B Boltzmann constant (1.380648 × 10 −23 J K −1) Ms Saturation magnetization (Am −1) Mn Magnetic number (−) m p Magnetic moment of nanoparticles (Am 2) Nu Nusselt number(−) P Pressure (Pa) Pr Prandtl number (−) q′′ Heat flux (Wm −2) q* Non-dimensional heat flux (−) r Radial coordinate (m) R c Radius of curvature (m) Re Reynolds number (−) S f Volumetric entropy generation rate due to friction (Wm −3 K −1) S gen Total volumetric entropy generation rate (Wm −3 K −1) S T Volumetric entropy generation rate due to heat transfer (Wm −3 K −1) T Temperature (K) u, v, w Velocity components (ms −1) x, y, z Cartesian coordinates (m) Greek symbols α Particle volume fraction (−) μ Dynamic viscosity (Pa s −1) μ B Bohr magneton (9.274 × 10 −24 Am 2) μ o Vacuum permeability (Tm A −1) ξ Langevin parameter (−) ρ Density (kg m −3) ϕ v Viscous dissipation function (s −1

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“…Several numerical and experimental studies have been carried out, considering the ferrofluid's thermomagnetic convection in different geometries, by employing an external magnetic field . The flow and convection heat transfer of a ferrofluid, which was subjected to the magnetic dipole has been investigated by Strek and Jopek .…”

Section: Introductionmentioning

confidence: 99%

Numerical investigation of nonuniform transverse magnetic field effects on the flow and heat transfer of magnetic nanofluid in a sintered porous channel

Kamali

Aminfar

Mohammadpourfard

et al. 2019

Heat Trans. Asian Res.

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In this paper, fluid flow and convective heat transfer of a ferrofluid (water and 4 vol% Fe 3 O 4 ) in sintered Aluminum porous channel, which is subjected to a nonuniform transverse magnetic field have been studied. The numerical simulations supposed an ordinary cubic and staggered arrangement organized by uniformly sized particles with a small contact area for the porous media and constant heat flux at the surface of the microchannel. A wire, in which the electric current passes creates a nonuniform magnetic field, which is perpendicular to the flow direction. To do this simulation, the control volume technique and the two-phase mixture model have been employed. The results show that the obtained local heat transfer coefficient on the channel surface increased with increasing mass flow rate and decreased slightly along the axial direction. Moreover, exerting the above-mentioned magnetic field increases the Nusselt number that enhances the heat transfer rate while it has no effect on the pressure drop along the channel. K E Y W O R D Sferrofluid, nonuniform transverse magnetic field, porous media, two-phase mixture model

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Numerical Investigation of the Transient Hydrothermal Behavior of a Ferrofluid Flowing Through a Helical Duct in the Presence of Nonuniform Magnetic Field

Cited by 14 publications

References 23 publications

Numerical Simulation of Free Convection Heat Transfer of Ferrofluid in an Oval Shaped Closed Loop

Numerical Simulation of Free Convection Heat Transfer of Ferrofluid in an Oval Shaped Closed Loop

Numerical study of magnetic field effect on the ferrofluid forced convection and entropy generation in a curved pipe

Numerical investigation of nonuniform transverse magnetic field effects on the flow and heat transfer of magnetic nanofluid in a sintered porous channel

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