Global instabilities in inhomogeneous mixed convection flows in semi-infinite porous media

Mejni, F.; Ouarzazi, M. N.

doi:10.1016/j.mechrescom.2008.09.002

Cited by 1 publication

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References 9 publications

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“…Investigations on mixed convection in porous media were extensive because of its relevance in many practical applications, such as nuclear reactors, groundwater, drying processes, heat exchangers, solar collectors, geophysical systems, and electronic cooling. Many studies have been dedicated to this topic in various settings (Mejni and Ouarzazi 2009;Pal and Talukdar 2011;Alves et al 2014;Chakkingal et al 2020;Yerramalle et al 2021). Bondarenko et al (2019) and Çolak et al (2021) showed that placing adherent or partially heated porous blocks in the center of a lid-driven cavity can significantly improve the heat transfer under specific conditions of blocks size, Darcy number, and heater position.…”

Section: Introductionmentioning

confidence: 99%

Ferrohydrodynamics Mixed Convection of a Ferrofluid in a Vertical Channel with Porous Blocks of Various Shapes

2023

JAFM

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Numerical simulations of (water-Fe3O4) ferrohydrodynamics (FHD) mixed convection inside a vertical channel are performed. The magnetic field is produced by three sources positioned outside the channel’s right wall. The latter is provided with localized heat sources surmounted by variously shaped porous blocks: rectangular, trapezoidal, and triangular. The general model of Darcy-Brinkman-Forchheimer is employed to describe the fluid flow in the porous regions, and the resulting equations are numerically solved by the finite volume approach. The influence of significant parameters, including the magnetic number (Mn), the Richardson number (Ri), and the shape of blocks, is examined. The results essentially reveal that the enhanced heat transfer brought by the magnetic field and its intensity increase is suppressed by the augmentation of Ri until a critical value, rising with Mn, beyond which the global Nusselt number increases again. The mean friction coefficient increases with increased Mn and reduced Ri. Compared to the case with no magnetic field, the maximum enhancement in heat transfer rate is around 132% for the rectangular blocks, 146% for the trapezoidal blocks, and 160% for the triangular blocks, while the maximum increase in pressure drop is approximately 45% for all the shapes. The triangular shape seems the most efficient because it leads to high heat transfer rates and low mean friction coefficients; its performance factor is 2.32 for a dominant magnetic field and 2.62 for a dominant buoyancy force. The current research's conclusions will help optimize the operation of various thermal engineering systems, including electronic devices, where the improved heat removal rate will keep the electronic components at a safe operating temperature.

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Section: Introductionmentioning

confidence: 99%

Ferrohydrodynamics Mixed Convection of a Ferrofluid in a Vertical Channel with Porous Blocks of Various Shapes

2023

JAFM

View full text Add to dashboard Cite

show abstract

Global instabilities in inhomogeneous mixed convection flows in semi-infinite porous media

Cited by 1 publication

References 9 publications

Ferrohydrodynamics Mixed Convection of a Ferrofluid in a Vertical Channel with Porous Blocks of Various Shapes

Ferrohydrodynamics Mixed Convection of a Ferrofluid in a Vertical Channel with Porous Blocks of Various Shapes

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