Mixed thermomagnetic convection of ferrofluid in a porous cavity equipped with rotating cylinders: LTE and LTNE models

Barnoon, Pouya; Toghraie, Davood; Salarnia, Mohammad; Karimipour, Arash

doi:10.1007/s10973-020-09866-7

Cited by 27 publications

(2 citation statements)

References 58 publications

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“…For the porous layer, solid phase as well as the fluid phase are purported to be in LTNE and a solid-fluid field model is considered to express distinctly the temperatures with regard to the solid and fluid phases. ... (7) ... (8) ... (9) ... (10) ... (11) ... (12) ... (13…”

Section: Mathematical Formulationmentioning

confidence: 99%

Local Thermal Non-Equilibrium Dominant Darcy-Rayleigh-Benard-Magneto-Marangoni Convection in a Composite Layer

Sumithra¹,

Venkatraman²

2022

jmmf

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The domination by Local Thermal Non-Equilibrium (LTNE) with regard to the onset of Darcy-Rayleigh-Benard-Marangoni (DRBM) convection swayed by magnetic field in a composite layer set-up is studied pertinent to incompressible fluid. The precinct above the fluid layer is presumed to be free and that below the porous layer is presumed to be rigid. Regular perturbation technique is exercised on the acquired problem to achieve the analytical solution taking adiabatic-adiabatic conditions into account at the boundaries. Effects of parameters such as solid phase thermal expansion ratio, solid phase thermal diffusivity ratio and inter-phase thermal diffusivity ratio that influences LTNE are discussed. The impact of change in measures of variables viz. fluid phase thermal expansion ratio, fluid phase thermal diffusivity ratio, porous parameter, thermal ratio, Chandrasekhar number and Marangoni number with respect to both LTNE and LTE situations are together explored and portrayed graphically. It is to be noted that for smaller values of fluid phase thermal expansion ratio and fluid phase thermal diffusivity ratio, the LTNE effects are prominent and cannot be ignored.

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Section: Mathematical Formulationmentioning

confidence: 99%

Local Thermal Non-Equilibrium Dominant Darcy-Rayleigh-Benard-Magneto-Marangoni Convection in a Composite Layer

Sumithra¹,

Venkatraman²

2022

jmmf

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“…Laminar, convective flow of a non-Newtonian ferrofluid inside an elliptical porous cavity was simulated by Garmroodi et al [49] in the presence of a non-uniform external magnetic field and found that the overall rate of heat transfer increases due to the application of the magnetic field. Moreover, the impact of MHD and porous medium on a mixed convection flow of a nanofluid in a cavity with rotating cylinders was studied by Barnoon et al [50]. Recently, Alaidrous et al [51] have investigated the electromagnatic radiative non-Newtonian nanofluid flow with Joule heating and higher order reactions in porous materials.…”

Section: Introductionmentioning

confidence: 99%

Carreau ferrofluid flow with inclined magnetic field in an enclosure having heated cylinder

2021

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A two-dimensional laminar flow of a non-Newtonian Carreau ferrofluid under the influence of a uniform inclined magnetic field is considered in a square cavity with a stationary heated cylinder. The objective is to determine the impact of nonlinear variation of the ferrofluid's viscosity with the shear rate on velocity and temperature distributions, localized and average heat transfer, and also on entropy generation. The Boussinesq approximation is assumed to be valid, making the momentum transport sensitive to thermal transport. Solutions are obtained numerically over a refined mesh with a customized OpenFOAM solver, which accounts for the coupling of Navier-Stokes equations with Maxwell equations. Controlling parameters are computed based on the physical properties of the base fluid and nanoparticles. For validation, present solutions are compared with the available published data and are found to be in good agreement with each other. Through a detailed analysis, it is concluded that the inclined magnetic field, volume fraction, and power-law index can sufficiently alter the momentum and thermal fields and, consequently, the local and mean heat transfer rates and the irreversibility generated due to fluid friction, heat transfer, and magnetic field. Particularly, the investigation reveals that the rate of heat transfer can be optimized with the help of the applied magnetic field direction, and in the present situation, the maximum heat transfer rate can be achieved when it is implemented in the vertical direction (Γ = π/2). The average Bejan number, Be avg , computed for the pure fluid and ferrofluid indicate that the irreversibility due to heat transfer is dominant compared to the fluid friction irreversibility.

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Numerical investigation of swirling flow and heat transfer of a nanofluid in a tube with helical ribs using a two-phase model

Monfared

Niknejadi

Toghraie

et al. 2021

J Therm Anal Calorim

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Mixed thermomagnetic convection of ferrofluid in a porous cavity equipped with rotating cylinders: LTE and LTNE models

Cited by 27 publications

References 58 publications

Local Thermal Non-Equilibrium Dominant Darcy-Rayleigh-Benard-Magneto-Marangoni Convection in a Composite Layer

Local Thermal Non-Equilibrium Dominant Darcy-Rayleigh-Benard-Magneto-Marangoni Convection in a Composite Layer

Carreau ferrofluid flow with inclined magnetic field in an enclosure having heated cylinder

Numerical investigation of swirling flow and heat transfer of a nanofluid in a tube with helical ribs using a two-phase model

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