Mixed convective ferrofluid flow through a corrugated channel with wall-mounted porous blocks under an alternating magnetic field

Job, Victor M.; Gunakala, Sreedhara Rao

doi:10.1016/j.ijmecsci.2018.05.054

Cited by 26 publications

(9 citation statements)

References 16 publications

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“…Two current‐carrying wires located below the bottom wall at

(x, y) = (0.4 L, - 0.25 h)

and above the top wall at

(x, y) = (0.4 L, 1.25 h)

produce a non‐uniform alternating magnetic field

H = (H_{x}, H_{y})

, where [16,18]:

\begin{matrix} true \\ right H_{x} (x, y, t) & = & left - \frac{I}{2 π} \frac{y + 0.25 h}{{false(x - 0.4 L false)}^{2} + {false(y + 0.25 h false)}^{2}} ([] 1 + s i n (2 π ω t)) \\ left - \frac{I}{2 π} \frac{y - 1.25 h}{{false(x - 0.4 L false)}^{2} + {false(y - 1.25 h false)}^{2}} ([] 1 - s i n (2 π ω t)) \end{matrix}

\begin{matrix} true \\ right H_{y} (x, y, t) & = & left \frac{I}{2 π} \frac{x - 0.4 L}{{false(x - 0.4 L false)}^{2} + {false(y + 0.25 h false)}^{2}} ([] 1 + s i n (2 π ω t)) \\ left + \frac{I}{2 π} \frac{x - 0.4 L}{{false(x - 0.4 L false)}^{2} + {false(y - 1.25 h false)}^{2} <...>} \end{matrix}

…”

Section: Problem Formulationmentioning

confidence: 99%

“…The authors noted that a value of magnetic field frequency exists at which the heat transfer enhancement is maximum; this frequency value increases with increased Reynolds number. Job and Gunakala [16] studied the two‐phase mixed convective flow of water‐based magnetite ferrofluid through a corrugated channel with wall‐mounted porous blocks in the presence of an alternating magnetic field. It was determined that increases in Eckert numer, wall amplitude, Darcy number, Grashof number and Reynolds number enhances the cycle‐space‐averaged Nusselt number.…”

Section: Introductionmentioning

confidence: 99%

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Numerical study on mixed convective flow of water‐based magnetite nanofluid through a wavy channel containing porous blocks under the effect of an oscillating magnetic field

Job

Gunakala

2021

Z Angew Math Mech

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In this paper, the convective flow of magnetite (Fe3O4)‐water nanofluid through a wavy channel containing porous blocks in the presence of a non‐uniform oscillating magnetic field with magnetohydrodynamic (MHD) and ferrohydrodynamic (FHD) effects is considered. This magnetic field is produced by two current‐carrying wires, which are placed at fixed positions on the outside of the channel. In the present study, we use a two‐phase model that considers the effects of thermophoresis and Brownian motion on the concentration of nanoparticles within the fluid. The associated system of partial differential equations is solved using the mixed finite element method with double-struckP2−double-struckP1 Taylor‐Hood elements and the effects of time t, Strouhal number St, Hartmann number Ha, magnetic number Mn, solid volume fraction ϕ0, nanoparticle diameter ds on the fluid flow, heat transfer, concentration distribution and pressure drop within the channel are investigated.

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“…Two current‐carrying wires located below the bottom wall at

(x, y) = (0.4 L, - 0.25 h)

and above the top wall at

(x, y) = (0.4 L, 1.25 h)

produce a non‐uniform alternating magnetic field

H = (H_{x}, H_{y})

, where [16,18]:

\begin{matrix} true \\ right H_{x} (x, y, t) & = & left - \frac{I}{2 π} \frac{y + 0.25 h}{{false(x - 0.4 L false)}^{2} + {false(y + 0.25 h false)}^{2}} ([] 1 + s i n (2 π ω t)) \\ left - \frac{I}{2 π} \frac{y - 1.25 h}{{false(x - 0.4 L false)}^{2} + {false(y - 1.25 h false)}^{2}} ([] 1 - s i n (2 π ω t)) \end{matrix}

\begin{matrix} true \\ right H_{y} (x, y, t) & = & left \frac{I}{2 π} \frac{x - 0.4 L}{{false(x - 0.4 L false)}^{2} + {false(y + 0.25 h false)}^{2}} ([] 1 + s i n (2 π ω t)) \\ left + \frac{I}{2 π} \frac{x - 0.4 L}{{false(x - 0.4 L false)}^{2} + {false(y - 1.25 h false)}^{2} <...>} \end{matrix}

…”

Section: Problem Formulationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Numerical study on mixed convective flow of water‐based magnetite nanofluid through a wavy channel containing porous blocks under the effect of an oscillating magnetic field

Job

Gunakala

2021

Z Angew Math Mech

Self Cite

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show abstract

“…While a negative magnetic field gradient increased friction coefficient and the Nusselt number on the inner wall, a magnetic field with a positive gradient leads to the opposite effect as both characteristics reduce. Job and Gunakala [28] analyzed mixed convection flow of a water-based ferrofluid in a wavy channel with two porous blocks mounted on the heated sections of the walls under the effect of an alternating magnetic field. They found that when the porous block thickness increases in a small values range, The average Nusselt number reduces, while the opposite is true when the thickness increases through large values.…”

Section: Introductionmentioning

confidence: 99%

Effect of a Magnetic Field on Mixed Convection in a Rectangular Cavity Filled with Ferrofluid

Harfi¹,

Kaddiri²,

Lamsaadi³

et al. 2021

IJHT

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The present work analyzes both numerically and analytically mixed convection heat transfer in shallow rectangular enclosure files confining ferrofluid, and exposed to temperature conditions of Neuman type with uniform heat flux applied to the short vertical sides, while the top wall is moving with a uniform velocity in the same direction as the applied heat flux. The finite volume method and the SIMPLER algorithm were used to numerically solve the governing equations, while the analytical solution is based on the parallel flow approximation. Simulations are conducted a wide range of controlling parameters, namely, the Reynolds, Hartmann and Richardson numbers and the solid volume fraction of ferroparticles. Effects of mentioned parameters, on the flow structure, temperature fields, and heat transfer rate, were studied and discussed.

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“…A rough surface is one of the techniques for passively enhancing the heat transfer. For decades, finned tubes [12,13], coiled tubes [14], inserts [15,16], and corrugated tubes [17][18][19][20][21][22] have been extensively studied. The effects of enhanced geometries on the heat transfer of boiling refrigerants have been addressed in several studies.…”

Section: Introductionmentioning

confidence: 99%

Numerical Investigation of the Heat Transfer Characteristics of R290 Flow Boiling in Corrugated Tubes with Different Internal Corrugated Structures

2021

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The heat transfer and pressure drop characteristics of R290 flow boiling in a corrugated tube were investigated through computational fluid dynamics (CFD) in this study. We established a model of flow boiling in a corrugated tube with different corrugated structures (rectangular and circular corrugations) and validated the model using the Liu–Winterton and Xu–Fang empirical equations. The heat transfer coefficient (HTC) and pressure drop were obtained at a mass flow rate of 0.04–0.2 kg/s and a water inlet temperature of 310–330 K. The results show that the HTC and the drop in the pressure of the corrugated tubes both obviously increased compared with a smooth tube as the mass flow rate increased. The HTC decreased for the three tubes as the water inlet temperature increased, while the drop in pressure slightly increased for the three tubes. Moreover, the corrugated structure was found to significantly enhance the heat transfer; the heat transfer enhancement factor (E1) of the corrugated tube with the rectangular corrugations and the corrugated tube with the circular corrugations was 2.01–2.36 and 1.67–1.98, respectively. The efficiency index (I) for both the rectangular corrugated pipe and the circular corrugated pipe was greater than 1 (1.05–1.24 and 1.13–1.29, respectively). The application of corrugated tubes with round and rectangular corrugations can reduce the heat transfer area required for the exchange of heat and, thus, reduce the cost.

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Mixed convective ferrofluid flow through a corrugated channel with wall-mounted porous blocks under an alternating magnetic field

Cited by 26 publications

References 16 publications

Numerical study on mixed convective flow of water‐based magnetite nanofluid through a wavy channel containing porous blocks under the effect of an oscillating magnetic field

Numerical study on mixed convective flow of water‐based magnetite nanofluid through a wavy channel containing porous blocks under the effect of an oscillating magnetic field

Effect of a Magnetic Field on Mixed Convection in a Rectangular Cavity Filled with Ferrofluid

Numerical Investigation of the Heat Transfer Characteristics of R290 Flow Boiling in Corrugated Tubes with Different Internal Corrugated Structures

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