Numerical simulation of double-diffusive mixed convection and entropy generation in a lid-driven trapezoidal enclosure with a heat source

Ababaei, Ahmad; Abbaszadeh, Mahmoud; Arefmanesh, A.; Chamkha, Ali J.

doi:10.1080/10407782.2018.1459139

Cited by 29 publications

(9 citation statements)

References 42 publications

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“…The findings revealed that the effects of the moving lid became negligible for , although the increasing Rayleigh number led to more excellent streamline circulation and dominant convection effects within the enclosure. While in another investigation, the results indicated that the average Nusselt number decreased as the Lewis number increased, while the total entropy production increased 15 . Al-Rashed et al 16 examined mixed convection and entropy generation in a cubical heated up by a central isothermal block.…”

Section: Introductionmentioning

confidence: 85%

Entropy production and mixed convection within trapezoidal cavity having nanofluids and localised solid cylinder

Ishak

Alsabery

Hashim

et al. 2021

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The entropy production and mixed convection within a trapezoidal nanofluid-filled cavity having a localised solid cylinder is numerically examined using the finite element technique. The top horizontal surface moving at a uniform velocity is kept at a cold temperature, while the bottom horizontal surface is thermally activated. The remaining surfaces are maintained adiabatic. Water-based nanofluids ($$\text {Al}_2\text {O}_3$$ Al 2 O 3 nanoparticles) are used in this study, and the Boussinesq approximation applies. The influence of the Reynolds number, Richardson number, nanoparticles volume fraction, dimensionless radius and location of the solid cylinder on the streamlines, isotherms and isentropic are examined. The results show that the solid cylinder’s size and location are significant control parameters for optimising the heat transfer and the Bejan number inside the trapezoidal cavity. Furthermore, the maximum average Nusselt numbers are obtained for high R values, where the average Nusselt number is increased by 30% when R is raised from 0 to 0.25.

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Section: Introductionmentioning

confidence: 85%

Entropy production and mixed convection within trapezoidal cavity having nanofluids and localised solid cylinder

Ishak

Alsabery

Hashim

et al. 2021

Sci Rep

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“…In this work, the irreversibility coefficient ratios ( φ i , 1 ≤ i ≤ 3) are taken as φ 1 = 10 −4 , φ 2 = 0.5 and φ 3 = 10 −2 (Mchirgui et al , 2012; Oueslati et al , 2013; Ababaei et al , 2018; Hussain et al , 2018). The total entropy generation ( S T ) is defined as follows: …”

Section: Entropy Generation Analysismentioning

confidence: 99%

“…Three different entropy parameters can be written in dimensionless form as follows (Ababaei et al, 2018;Hussain et al, 2018):…”

Section: Entropy Generation Analysismentioning

confidence: 99%

“…Magherbi et al (2006) investigated the entropy generation for thermosolutal convection and observed that the values of total entropy generation increased with the thermal Grashof number at moderate Lewis numbers. Ababaei et al (2018) have discussed the entropy generation of thermosolutal mixed convection in a right-angled trapezoidal enclosure. They have shown that the overall generated entropy increases dramatically when the heater moves toward the cold border.…”

Section: Introductionmentioning

confidence: 99%

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On the analysis of thermosolutal mixed convection in differentially heated and soluted geometries beyond rectangular

Hansda

Pandit

2023

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Purpose This paper aims to study the impact of convexity and concavity of the vertical borders on double-diffusive mixed convection. In addition, the study of entropy generation is performed. This numerical study has been carried out for different patterns of wavy edges to reveal their effects on heat and mass transfer phenomena. Design/methodology/approach Four different flow features are treated by varying the directions of convexity and concavity of the vertical walls. A uniform temperature, as well as concentration distributions, are introduced to the left border while keeping a cold temperature and low concentration for the right border. The horizontal boundaries are in adiabatic condition. The upper border of the chamber is moving in the right direction with an equal speed. The governing Navies–Stokes equations are designed to describe energy and species transport phenomena, and these equations are solved by compact scheme. Findings The investigated results are analyzed for various parameters, namely, Prandtl number, Richardson number, thermal Grashof number, Lewis number, Buoyancy ratio and amplitude of the wavy walls. It is observed that the thermal and solutal transfer performance becomes effective with lower Richardson numbers. The results reveal that the concavity and convexity of the side borders of the cabinet can control the thermosolutal performance. It is also observed that among all wavy chambers, Case-4 records maximum thermosolutal transfer rate, while Case-3 attains minimum thermosolutal transfer rate. Originality/value This work is an example of solar thermal power conversion, power collection systems, systems of energy deficiency, etc.

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“…In another study, Chamkha and Ismael (2016) studied the dampening effect of magnetic fields on thermal behavior. Mixed convection under the double-diffusion of air (Pr = 0.7) filled right-angled trapezoidal enclosure (with inward side angles of 45º and 60º) heated partially has been investigated by Ababaei et al (2018) and observed that heat and mass transfer were significantly affected by the side angle as well as flow control parameters. using different types of nanofluids, Kareem et al (2016) examined the bottom heated inclined trapezoidal cavity (with side angle 30º–60º) with a moving cold top wall and found that heat transfer is more with higher nanoparticle concentration and at a lower rotational angle.…”

Section: Introductionmentioning

confidence: 99%

Hybrid nanofluid magnetohydrodynamic mixed convection in a novel W-shaped porous system

Mandal¹,

Biswas

Manna

et al. 2022

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Purpose This study aims to numerically examine the influence of various geometric parameters of a novel W-shaped porous cavity undergoing hybrid nanofluid-based magnetohydrodynamic mixed convection. The W-shaped cavity is modified from the classical trapezoidal cavity by constructing a triangular shape at its bottom. This cavity is isothermally active at the bottom, with different numbers and heights of the triangular peak (or undulation). The heated hybrid nanofluid (Cu–Al2O3–H2O) flow is cooled through the translating top wall. Inclined sidewalls are thermally insulated. To compare the impacts of change in geometric parameters, a square cavity under similar boundary conditions is also simulated. This study is carried out systematically addressing the various influences from a range of parameters like side angles (γ), number (m) and height (λ) of the bottom undulation, Reynolds number (Re), Richardson number (Ri), Darcy number (Da), Hartmann number (Ha), hybrid nanoparticles volume fraction (φ) on the overall thermal performance of the cavity. Design/methodology/approach Applying the finite volume approach, the transport equations involving multiphysical conditions like porous substance, hybrid nanofluid, magnetic field and shearing force are solved numerically by using a written FORTRAN-based code following the SIMPLE algorithm. The algebraic equations are solved over all the control volumes in an iterative process using the alternate direction implicit scheme and the tri-diagonal matrix algorithm. The converged solution of the iterative process is obtained when the relative error levels satisfy the convergence criterion of 10–8 and 10–10 for the maximum residuals and the mass defect, respectively. Findings It is revealed that an increase in the bottom undulation height always improves the thermal energy transfer despite the reduction of fluid volume. Thermal energy transfer significantly depends on the heating and cooling surface lengths, fluid volume in the cavity and the magnitude of the bottom undulation height of the W-shaped cavity. With the increase in bottom undulation height, effective heating length increases by ∼28%, which leads to a ∼15% reduction in the effective volume of the working fluid and a gain in heat transfer by ∼56.48%. In general, the overall thermal energy transport is improved by increasing Re, Ri and Da; whereas it is suppressed by increasing Ha. Research limitations/implications There are many opportunities for future research experimentally or numerically, considering different curvature effects, orientations of the geometry, working fluids, boundary conditions, etc. Furthermore, this study could be extended by considering unsteady flow or turbulent flow. Practical implications In many modern systems/processes pertaining to materials processing, continuous casting, food processing, chemical reactors, biomedical applications, etc. fine control in the transport process is a major concern. The findings of this analysis can effectively be useful for other applications for getting more control features in terms of achieving the operational objectives. The approach of the system analysis (considering geometrical size parameters to delve into the underlying transport physics) and the obtained simulated results presented in the work can usefully be applicable to similar thermal systems/devices such as materials processing, thermal mixing, chemical reactors, heat exchangers, etc. Originality/value From the well-documented and vast pool of literature survey, it is understood that there exists no such investigation on the considered geometry and study. This study contributes a lot to understanding magnetic field moderated thermofluid flow of a hybrid nanofluid in a porous medium filled W-shaped cavity, in consideration of different geometrical shape parameters (undulation peak numbers at bottom wall, peak heights, side angles and heating and cooling length). Findings brought by this study provide great insights into the design and operation under various ranges of multiphysical thermofluid-flow processing phenomena.

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Numerical simulation of double-diffusive mixed convection and entropy generation in a lid-driven trapezoidal enclosure with a heat source

Cited by 29 publications

References 42 publications

Entropy production and mixed convection within trapezoidal cavity having nanofluids and localised solid cylinder

Entropy production and mixed convection within trapezoidal cavity having nanofluids and localised solid cylinder

On the analysis of thermosolutal mixed convection in differentially heated and soluted geometries beyond rectangular

Hybrid nanofluid magnetohydrodynamic mixed convection in a novel W-shaped porous system

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