Numerical investigation of the magnetic field effect on the heat transfer and fluid flow of ferrofluid inside helical tube

Mousavi, Sayedali; Jamshidi, N.; Rabienataj-Darzi, A. A.

doi:10.1007/s10973-019-08066-2

Cited by 24 publications

(9 citation statements)

References 49 publications

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“…Based on this, numerous experimental and numerical studies have thoroughly analyzed the enhancement of heat transfer in heat exchangers 1–7 . Among them, helical tubes have attracted much attention due to their high thermal performance 8–16 . The centrifugal force creates a secondary flow in the helical heat exchangers and therefore increases the heat transfer.…”

Section: Introductionmentioning

confidence: 99%

A numerical study of flow behavior in the shell and helical finned‐tube heat exchanger

et al. 2021

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Extended surfaces mostly aim to improve the heat transfer upon increasing the area of heat transfer. In this paper, the influence of using fins on flow behaviors and the heat transfer of the shell and tube heat exchanger has been investigated. In this regard, the present results are verified with available experimental data in the literature for a helical tube without fins. The effects of fin density (fin per inch), its height, and material have been studied on the heat transfer rate. In addition, the effects of radial pitch and the number of coil loops are studied. The results indicate that implementing extended surfaces significantly increases the heat transfer rate. The increase of fin density from 8 to 12 and the height from 11.5 to 13.5 mm enhances heat transfer up to 48% and 43% depending on Dean number, respectively. The rise of coil pitch augments the overall heat transfer, and it is more efficient at lower Dean numbers. The predicted results also show that the fin material does not have any significant effect on heat transfer.

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Section: Introductionmentioning

confidence: 99%

A numerical study of flow behavior in the shell and helical finned‐tube heat exchanger

et al. 2021

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“…Importantly, it plays a major role in the field of aeronautics. The impact of the magnetic field on different fluid flows through various surfaces was studied by different researchers 23‐27 . Joule impact and Joule's law are some of the few distinctive physical impacts found or characterized by English physicist James Prescott Joule.…”

Section: Introductionmentioning

confidence: 99%

Heat transfer in dusty fluid with suspended hybrid nanoparticles over a melting surface

Radhika¹,

Gowda

Naveenkumar

et al. 2020

Heat Trans

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The melting effect with the magnetic field performs a significant role in various manufacturing and industrial applications, such as welding, casting, magma‐solidification, nuclear engineering, and so forth. The present study focuses on the impact of the melting effect and magnetic field with inhomogeneous heat origination and sink. The formulation of the mathematical model is done by considering fluid with hybrid nanoparticles and dust particles in two different phases. We have considered Fe2SO4 and Cu as nanoparticles dispersed in the base fluid water along with suspended dust particles. The set of partial differential equations is reduced by using apt similarity variables and boundary conditions to obtain ordinary differential equations. The numerical solution is approximated using MATLAB‐bvp4c adopting the shooting technique. The impact of numerous pertinent physical parameters on the velocity and thermal profiles is plotted and deliberated. Furthermore, the rate of heat flow and friction factor is also tabulated and visualized through the graphs. Streamlines are also drawn to know the behavior of the fluid flow. The rise in values of ME quickly increases the velocity of the fluid motion but declines the thermal gradient and thickness of its related boundary layer. Also, inclining values of Pr enhance the thermal profile due to the impact of melting.

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“…Mousavi el al [22] numerically investigated the effect of a linear magnetic field on the ferrofluid forced convection in a coiled tube. They explored the effects of Reynolds number and magnetic field gradient on the heat transfer rate and pressure drop.…”

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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Numerical investigation of the magnetic field effect on the heat transfer and fluid flow of ferrofluid inside helical tube

Cited by 24 publications

References 49 publications

A numerical study of flow behavior in the shell and helical finned‐tube heat exchanger

A numerical study of flow behavior in the shell and helical finned‐tube heat exchanger

Heat transfer in dusty fluid with suspended hybrid nanoparticles over a melting surface

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

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