Unsteady convective ferrohydrodynamic flow of MnZnFe2O4/FeCrNbB - EG hybrid nanofluid in a horizontal channel with porous fins and semi-circular heaters

Job, Victor M.; Gunakala, Sreedhara Rao; Gorla, Rama Subba Reddy; Makinde, Oluwole Daniel; Basha, H. Thameem

doi:10.1016/j.jmmm.2023.170584

“…Job et al [7] researched the unsteady and incompressible flow in a horizontal channel of a hybrid nanofluid consisting of MnZnFe2O4/FeCrNbB. The top wall of the channel contains four porous fins.…”

Section: Introductionmentioning

confidence: 99%

Numerical Study on Entropy Generation in a Horizontal Channel with Fins Using Hybrid Nanofluid

Khentoul,

Bessaïh

2024

IJHT

0

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This study involved performing a two-dimensional numerical analysis of forced convection in a horizontal channel, to cool fins mounted on heated channel walls, with the use of a laminar hybrid nanofluid. The finite volume approach, employing the SIMPLER algorithm, was used to solve the determining equations. The effect of fin height "hf", fin space "d" and nanoparticle volume fraction (ϕ) on the flow structure, entropy generation, and heat transfer enhancement are analyzed and discussed. The results were exposed in streamlines, isotherms, average Nusselt numbers, total and local entropy generation, thermal and friction, and the Bejan number. The results indicate that increasing the height of the fins leads to an improvement in heat transfer, but on the other hand, causes a notable elevation in entropy generation. The results further suggest that increasing the 'd' spacing (up to d=1.1) leads to a smooth and uniform passage of fluid between the fins, thereby reducing entropy generation. However, it also results in poor cooling of the fins.

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“…These nanofluids, comprising a base fluid infused with nanoparticles of various materials, offer promise for enhancing thermal properties in engineering applications. The unsteady convective flow of a magnetic hybrid nanofluid through a channel with semi-circular heaters and porous fins is investigated by Job et al 33 Shaw et al 34 delve into the behavior of hydromagnetic flow and heat transfer in non-Newtonian hybrid nanofluids, considering factors such as fluid friction and radiation models to elucidate their impact on thermal performance. Similarly, Sindhu et al 35 undertake a systematic exploration of hybrid nanofluids, studying the effect of particle shape on heat transfer enhancement in microchannels.…”

Section: Introductionmentioning

confidence: 99%

Exact solutions of hydromagnetic convective flow in a microchannel with superhydrophobic slip and temperature jump: Microfluidics applications

Sajjan,

Raju

2024

Heat Trans

2

0

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The researchers explored the free convective flow of a hybrid nanofluid in a vertical microchannel with a rectangular cross‐section. Notably, both channel walls were heated alternately, and a transverse magnetic field was applied across the channel. The channel walls had unique properties, one of which was nonslip and the other was exceedingly hydrophobic. The major purpose was to investigate the effects of magnetism and superhydrophobicity on important flow parameters. The differential equations in the investigation were solved, producing accurate results. The study yielded some significant discoveries. First, when heated, the magnetic parameter reduced skin friction on both sides. Second, in both heating conditions, the magnetic field reduced flow rate and velocity. The flow rates in the two reported situations were similar at a crucial temperature jump coefficient. Furthermore, for low‐temperature jump coefficients, heating the superhydrophobic side reduced the Nusselt number whereas heating the nonslip side had no magnetic effect. The percentage change in the value of Nusselt number and velocity decreases continuously with increase in nonlinear density variation with temperature (NDT) parameter and magnetic parameter. The percentage increases in the value of skin friction with increase in temperature jump and slip length but decrease in the percentage of skin friction for the effect of magnetic term and NDT parameter. As the NDT parameter increases, the velocity percentage rises to 50.59% when the superhydrophobic surface is heated and to 84.30% when the nonslip surface is heated. The temperature jump is statistically significant for the value of the Nusselt number and skin friction for the no‐slip surface condition. These discoveries have practical consequences for the design and management of both tiny and large‐scale systems, with possible applications in microfluidics, microelectronics, nanoscience, and nanotechnology.

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“…By analyzing the investigations of the above workers, combined with the literature by Bao et al [30], and considering the wide usage of semicircular microchannels in various fields such as material science, biological science, engineering science, and thermal science [31][32][33][34] due to their unique shape, robust construction, and high heat transfer properties [35], our research will focus on further investigating the flow of a non-Newtonian fluid in a semicircular channel using electromagnetic electroosmotic drive. In this paper, we will build upon the existing research conducted by Bao et al [30] and select the Jeffrey fluid model for studying the flow properties of non-Newtonian fluids in semicircular microchannels.…”

Section: Introductionmentioning

confidence: 99%

Research on electromagnetic electroosmotic flow of Jeffrey fluid through semicircular microchannel

Dong,

Li,

Yu

et al. 2023

Eng. Res. Express

1

0

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This work extends the previous research on electroosmotic flow in semicircular microchannels, further investigating the electromagnetic electroosmotic flow of Jeffrey fluid under the combined action of the electric field force and electromagnetic force. The analytic solution of velocity is derived using the variable separation method. The influences of oscillation Reynolds number R e , Hartmann number H a , electric width K , relaxation time D e and retardation time λ 2 ω on velocity are examined through graphical analysis. The results show that an increase in Reynolds number R e leads to stronger oscillations in the velocity profile at any Hartmann number H a , and the change in velocity oscillations becomes more pronounced with increasing Hartmann number H a . Specifically, at lower Hartmann numbers H a , the velocity increases with an increase in electric width K and relaxation time D e , but decreases with an increase in retardation time λ 2 ω . An interesting finding is that, at higher Hartmann numbers H a , the velocity of the Jeffrey fluid still decreases under the influence of obstruction in the channel. Furthermore, the results of this study are compared with those of previous scholars to validate their accuracy.

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Unsteady convective ferrohydrodynamic flow of MnZnFe2O4/FeCrNbB - EG hybrid nanofluid in a horizontal channel with porous fins and semi-circular heaters

Cited by 10 publications

References 21 publications

Numerical Study on Entropy Generation in a Horizontal Channel with Fins Using Hybrid Nanofluid

Numerical Study on Entropy Generation in a Horizontal Channel with Fins Using Hybrid Nanofluid

Exact solutions of hydromagnetic convective flow in a microchannel with superhydrophobic slip and temperature jump: Microfluidics applications

Research on electromagnetic electroosmotic flow of Jeffrey fluid through semicircular microchannel

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