Numerical simulation of three-dimensional double diffusive free convection flow and irreversibility studies in a solar distiller

Ghachem, Kaouther; Kolsi, Lioua; Maatki, Chamseddine; Hussein, Ahmed Kadhim; Borjini, Mohamed Naceur

doi:10.1016/j.icheatmasstransfer.2012.04.010

Cited by 66 publications

(34 citation statements)

References 24 publications

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“…Double diffusion convection has flourished into a new category of subjects when thermofluid systems with different species concentrations are being investigated [2][3][4]. This topic has matured into a subject with various scientific and industrial applications such as solar distillers [5,6], solar ponds [7,8], liquefied natural gas storage [9] and solidification [10].…”

Section: Introductionmentioning

confidence: 99%

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%

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

Torabi

Peterson

2017

Entropy

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“…They observed that the growth rate of the frozen layer is almost double at the bottom of the cavity. Ghachem et al (2012) obtained numerical results by using finite volume method of double-diffusive natural convection in a 3D solar distiller for laminar flow. Also, they obtained entropy generation results.…”

Section: Frontiers In Heat and Mass Transfermentioning

confidence: 99%

Effects of Buoyancy Parameter on Unsteady 3d Double Diffusive Convection in Molten Pb-Sn Alloys

Öztop¹,

Chemseddine²,

Kolsi³

et al. 2017

Frontiers in Heat and Mass Transfer

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A computational study has been made for a three dimensional double diffusive convection with molten Pb-Sn by using finite volume method. In this work, two vertical walls have different temperature and different concentration while remaining walls are adiabatic. Buoyancy ratio, which changes between N = -0.1 and -10, is the main governing parameter during work. Other parameters are taken as fixed with Pr = 0.02, Le = 7500 and Ra = 5×10 3 . It is found that changing of buoyancy parameter becomes more effective on heat transfer than that of mass transfer.

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“…The construction of these equations is described in more details in Ghachem et al [29]. The dimensionless governing equations can be written as follows:…”

Section: Mathematical Model and The Numerical Solutionmentioning

confidence: 99%

Three-dimensional unsteady natural convection and entropy generation in an inclined cubical trapezoidal cavity with an isothermal bottom wall

Hussein

Kolsi

Chand³

et al. 2016

Alexandria Engineering Journal

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Numerical computation of unsteady laminar three-dimensional natural convection and entropy generation in an inclined cubical trapezoidal air-filled cavity is performed for the first time in this work. The vertical right and left sidewalls of the cavity are maintained at constant cold temperatures. The lower wall is subjected to a constant hot temperature, while the upper one is considered insulated. Computations are performed for Rayleigh numbers varied as 10 3 6 Ra 6 10 5 , while the trapezoidal cavity inclination angle is varied as 0°6 U 6 180°. Prandtl number is considered constant at Pr = 0.71. Second law of thermodynamics is applied to obtain thermodynamic losses inside the cavity due to both heat transfer and fluid friction irreversibilities. The variation of local and average Nusselt numbers is presented and discussed, while, streamlines, isotherms and entropy contours are presented in both two and three-dimensional pattern. The results show that when the Rayleigh number increases, the flow patterns are changed especially in three-dimensional results and the flow circulation increases. Also, the inclination angle effect on the total entropy generation becomes insignificant when the Rayleigh number is low. Moreover, when the Rayleigh number increases the average Nusselt number increases. Ó 2016 Faculty of Engineering, Alexandria University. Production and hosting by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/). . Production and hosting by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/). Please cite this article in press as: A.K. Hussein et al., Three-dimensional unsteady natural convection and entropy generation in an inclined cubical trapezoidal cavity with an isothermal bottom wall, Alexandria Eng. J. (2016), http://dx.

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Numerical simulation of three-dimensional double diffusive free convection flow and irreversibility studies in a solar distiller

Cited by 66 publications

References 24 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

Effects of Buoyancy Parameter on Unsteady 3d Double Diffusive Convection in Molten Pb-Sn Alloys

Three-dimensional unsteady natural convection and entropy generation in an inclined cubical trapezoidal cavity with an isothermal bottom wall

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