Second law analysis in double diffusive convection through an inclined porous cavity

Mchirgui, Ali; Hidouri, Nejib; Magherbi, Mourad; Brahim, Ammar Ben

doi:10.1016/j.compfluid.2014.03.008

Cited by 33 publications

(14 citation statements)

References 25 publications

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“…Later, these studies were extended to the second law analyses of double diffusion convection in porous systems [30][31][32][33]. An early study in this regard was performed by Mchirgui et al [30] for a porous cavity with constant temperatures and concentrations for the vertical walls.…”

Section: Introductionmentioning

confidence: 99%

“…An early study in this regard was performed by Mchirgui et al [30] for a porous cavity with constant temperatures and concentrations for the vertical walls. This investigation [30] was later extended to that of an inclined porous cavity [31]. In both studies [30,31], transient equations were considered and the transient total and local entropy generation rates were developed.…”

Section: Introductionmentioning

confidence: 99%

“…This investigation [30] was later extended to that of an inclined porous cavity [31]. In both studies [30,31], transient equations were considered and the transient total and local entropy generation rates were developed. More recently, Hussain [32] opted in favor of entropy generation in a tilted sinusoidal corrugated porous enclosure.…”

Section: Introductionmentioning

confidence: 99%

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Entropy Generation of Double Diffusive Forced Convection in Porous Channels with Thick Walls and Soret Effect

Torabi

Peterson

2017

Entropy

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Abstract:The second law performance of double diffusive forced convection in a horizontal porous channel with thick walls was considered. The Soret effect is included in the concentration equation and the first order chemical reaction was chosen for the concentration boundary conditions at the porous-solid walls interfaces. This investigation is focused on two principal types of boundary conditions. The first assumes a constant temperature condition at the outer surfaces of the solid walls, and the second assumes a constant heat flux at the lower wall and convection heat transfer at the upper wall. After obtaining the velocity, temperature and concentration distributions, the local and total entropy generation formulations were used to visualize the second law performance of the two cases. The results indicate that the total entropy generation rate is directly related to the lower wall thickness. Interestingly, it was observed that the total entropy generation rate for the second case reaches a minimum value, if the upper and lower wall thicknesses are chosen correctly. However, this observation was not true for the first case. These analyses can be useful for the design of microreactors and microcombustor systems when the second law analysis is taken into account.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Entropy Generation of Double Diffusive Forced Convection in Porous Channels with Thick Walls and Soret Effect

Torabi

Peterson

2017

Entropy

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“…It shows that the entropy generation due to heat transfer is localized at the areas where heat exchanged between the walls and the flow is maximum, while the entropy generation due to fluid friction is maximum at areas where the velocity gradients are maximum such as vortex centers. A numerical investigation of double-diffusive convection through an inclined porous cavity was carried out by Mchirgui et al [11]. They found that the entropy generation exhibits an oscillatory behavior for lower (Da = 10 −4 ) and higher (Da = 10 −2 ) medium permeability values, when α = 0 • .…”

Section: Introductionmentioning

confidence: 99%

Second Law Analysis in Mixed Convection Through an Inclined Porous Channel

2015

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The paper provides a numerical investigation of the entropy generation analysis due to mixed convection with viscous dissipation effect of a laminar viscous and incompressible fluid, flowing in an inclined channel filled with a saturated porous medium. The Darcy-Brinkman model is employed. The Navier-Stokes and energy equations are solved by classic Boussinesq incompressible approximation. A special attention is given to the study of the influence of the channel inclination angle on the transient and the steady-state entropy generation. The fluctuations of the transient total entropy generation are investigated when the inclination angle is varied from 0 • to 180 • . Moreover, the entropy generation and the Bejan number were studied as a function of the inclination angle of the channel, in the steady state of mixed convection. It was found that the total entropy generation is maximum at inclination angle close to 70 • and minimum at 0 • and 180 • .

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“…Study of the second law of thermodynamics in double diffusive convection for tilted porous cavity saturated with a binary perfect gas mixture is performed numerically. Heat and mass transfer and fluid flow patterns are discussed and graphically exhibited and analyzed the Control Volume Finite-Element Method (CVFEM) numerically by Ali Mchirgui et al (2014). Kishan Naikoti et al (2015) has reported a weighted residual Galerkin finite element numerical study of thermosolutal convection.…”

Section: Introductionmentioning

confidence: 99%

Mathematical Modelling of MHD Double – Diffusive Natural Convection Flow in a Square Enclosure

Venkatadri¹,

Mohiddin²,

Reddy³

2017

Frontiers in Heat and Mass Transfer

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Two-dimensional unsteady laminar double-diffusive free convective flow of a conducting fluid in a thermally insulated square enclosure except the left wall has been numerically studied in presence of heat generation/absorption. The Marker and Cell (MAC) method is employed for solving nonlinear momentum, energy and concentration equations and the numerical MATLAB code is validated with the previous study. The computed results are depicted graphically and discussed for various values of Rayleigh number (Ra), Hartmann number (Ha), Buoyancy ratio parameter (N), Lewis number (Le) and heat absorption/generation parameter (γ). It is observed that the rate of heat and mass transfer decreases with increasing Rayleigh number.

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Second law analysis in double diffusive convection through an inclined porous cavity

Cited by 33 publications

References 25 publications

Entropy Generation of Double Diffusive Forced Convection in Porous Channels with Thick Walls and Soret Effect

Entropy Generation of Double Diffusive Forced Convection in Porous Channels with Thick Walls and Soret Effect

Second Law Analysis in Mixed Convection Through an Inclined Porous Channel

Mathematical Modelling of MHD Double – Diffusive Natural Convection Flow in a Square Enclosure

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