Irreversibility Analysis for Double Diffusive Convection Flow of a Gas Mixture in a Chamfered Corners Square Enclosure Filled with a Porous Medium

Bouabid, Mounir; Ghoudi, Naoufel; Bouabda, Rahma; Magherbi, Mourad

doi:10.1007/s13369-020-04613-4

Cited by 3 publications

(1 citation statement)

References 23 publications

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“…[1][2][3][4][5] The greatest portion of the more pertinent binary gas literature has focused on analytical and numerical investigations of natural convection due to horizontal temperature and concentration gradients. [6][7][8][9][10][11][12] With the exception of some works using the non-Boussinesq model, [13][14][15][16][17] it appears that the Boussinesq approximation was used in both cases of aiding and opposing buoyancy forces, which states that variations of density in the equations of motion can safely be ignored everywhere except in its association with the external force. The approximation is well justified in the case of incompressible fluids.…”

Section: Introductionmentioning

confidence: 99%

Limit of the buoyancy ratio in Boussinesq approximation for double-diffusive convection in binary mixture

2021

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This paper deals with a mathematical and numerical investigation of double-diffusive natural convective heat and mass transfer in a cavity filled with Newtonian fluid with significant density and mass diffusivity changes. In such a situation, the assumption of the Boussinesq approximation is not justified, and an appropriate model based on a set of Low Mach Number equations is used. The active parts of two vertical walls of the cavity are maintained at fixed but different temperatures and concentrations, while the other two walls, as well as inactive areas of the sidewalls, are considered to be adiabatic and impermeable to mass transfer. The coupled momentum, energy, and solute transfer equations in binary mixtures of ideal gases are solved through a global iterative procedure based on the finite volume methods in the context of the low Mach number approximation. The study includes the effect of the buoyancy ratio N with the aim to find its application limit in the Boussinesq conditions. The results show that if we use the Boussinesq approximation to study double-diffusive convection, the value of parameter N must be between À6 and 27.M Ã þC10ð1ÀM Ã Þ kinematic viscosity, m 2 =s P ¼ðp À p þ q 0 gyÞ=q 0 ða 0 =HÞ 2 dimensionless dynamic pressure

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Section: Introductionmentioning

confidence: 99%

Limit of the buoyancy ratio in Boussinesq approximation for double-diffusive convection in binary mixture

2021

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Effect of a Sinusoidal Temperature Profile on Entropy Generation Due to Double-Diffusive Natural Convection in a Square Partly Porous Cavity

Omara,

Bourouis,

Bouchair

2023

ASME Journal of Heat and Mass Transfer

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In this manuscript, entropy generation due double-diffusive natural convection and sinusoidal heating on one side inside a composite enclosure is numerically analyzed for various values of some governing parameters. Finite Volume method (FVM) is used to discretize the resulting dimensionless coupled partial differential equations while the SIMPLE algorithm is used to deal with pressure-velocity coupling. The validity of the results obtained by the in-house FORTRAN code is verified by comparison with previous numerical and experimental work. It was found that in the case of comparable effects of temperature and concentration buoyancy forces (N=1), the heat transfer irreversibility increases with increasing α and becomes dominant for α=0.8, resulting in a values of average Bejan number, Beavg>0.5, while at high values of N (N=10), the fluid friction irreversibility dominates for all values of ?. Moreover, the results indicate that for the chosen values of Ra and Da, the entropy generation due to fluid friction is dominant when (Sψ)<1 (partly porous cavity), regardless of Rk, a and N values, whereas for pure porous cavity (Δ=1), Sθ(max) becomes dominant.

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Double diffusive convective transport and entropy generation in an annular space filled with alumina-water nanoliquid

Swamy

Sankar

Reddy

et al. 2022

Eur. Phys. J. Spec. Top.

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Irreversibility Analysis for Double Diffusive Convection Flow of a Gas Mixture in a Chamfered Corners Square Enclosure Filled with a Porous Medium

Cited by 3 publications

References 23 publications

Limit of the buoyancy ratio in Boussinesq approximation for double-diffusive convection in binary mixture

Limit of the buoyancy ratio in Boussinesq approximation for double-diffusive convection in binary mixture

Effect of a Sinusoidal Temperature Profile on Entropy Generation Due to Double-Diffusive Natural Convection in a Square Partly Porous Cavity

Double diffusive convective transport and entropy generation in an annular space filled with alumina-water nanoliquid

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