LBM simulation of natural convection in an inclined triangular cavity filled with water

Mejri, Imen; Mahmoudi, Ahmed; Abbassi, Mohamed Ammar; Omri, Ahmed

doi:10.1016/j.aej.2016.03.020

Cited by 27 publications

(27 citation statements)

References 14 publications

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“…They concluded that the direction of magnetic field has significant influence on the fluid flow, heat transfer and effect of nanoparticles on the thermal performance. Mejri et al (2016) analyzed the natural convection phenomenon in an water-filled inclined triangular using lattice Boltzmann method. The results show that the heat transfer rate influenced by the inclination angle based on the Rayleigh number.…”

Section: Free Convection Analysismentioning

confidence: 99%

Free convection analysis in a Γ-shaped heat exchanger using lattice Boltzmann method employing second law analysis and heatline visualization

Khakrah

Mohammaei

Hooshmand

et al. 2019

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Purpose The nanofluid flow and heat transfer within a heat exchanger, with different thermal arrangements of internal active bodies, are investigated. Design/methodology/approach For the numerical simulations, the lattice Boltzmann method is utilized. The KKL model is used to predict the dynamic viscosity of CuO-water nanofluid. Furthermore, the Brownian method is taken account using this model. The influence of shapes of nanoparticles on the heat transfer performance is considered. Findings The results show that the platelet nanoparticles render higher average Nusselt number showing better heat transfer performance. In order to perform comprehensive analysis, the heatline visualization, local and total entropy generation, local and average Nusselt variation are employed. Originality/value The originality of this work is carrying out a comprehensive investigation of nanofluid flow and heat transfer during natural convection using lattice Boltzmann method and employing second law analysis and heatline visualization.

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Section: Free Convection Analysismentioning

confidence: 99%

Free convection analysis in a Γ-shaped heat exchanger using lattice Boltzmann method employing second law analysis and heatline visualization

Khakrah

Mohammaei

Hooshmand

et al. 2019

HFF

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“…Bouali et al used a boundary element approximation and a Monte Carlo method to analyze numerically the impact of surface radiation and inclination angle on thermal fluid characteristics in an inclined rectangular enclosure. Further studies include Nouanegue et al, Kuznetsov and Sheremet, Moufekkir et al and Mejri et al…”

Section: Introductionmentioning

confidence: 99%

Computational study of heat transfer in solar collectors with different radiative flux models

Kuharat

Bég

Kadir

et al. 2019

Heat Trans. Asian Res.

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Two-dimensional steady incompressible laminar Newtonian viscous convection-radiative heat transfer in a rectangular solar collector geometry is considered. The ANSYS FLUENT finite volume code (version 17.2) is used to simulate the thermo-fluid characteristics. Extensive details of computational methodology are given to provide engineers with a framework for simulating radiative-convection in enclosures. Meshindependence tests and validation are conducted. The influence of aspect ratio, Prandtl number (Pr), Rayleigh number (Ra) and radiative flux model on temperature, isotherms, velocity, and pressure is evaluated and visualized in colour plots. In addition, local convective heat flux is computed, and solutions are compared with the MAC solver for various buoyancy effects achieving excellent agreement. The P1 model is shown to better predict the actual influence of solar radiative flux on thermal fluid behaviour compared with the limited Rosseland model. With increasing Ra, the hot zone emanating from the base of the collector is found to penetrate deeper into the collector and rises symmetrically dividing into two vortex regions with very high buoyancy effect. With increasing Pr there is a progressive incursion of the hot zone at the solar collector base higher into the solar collector space and simultaneously a greater asymmetric behaviour of the dual isothermal zones.ANSYS FLUENT, aspect ratio, inite volume, MAC computational algorithm, radiative heat transfer, solar collector enclosure, thermal convection 1 | INTRODUCTION The interest in sustainable and renewable energy systems has witnessed significant expansion in the 21st century. Both land-based (terrestrial) and space-based (astronautical) types of solar collector have attracted considerable attention. Solar thermal collectors utilize the incoming radiation by converting it directly into heat whereas photovoltaics convert the radiation into electricity. Solar thermal systems therefore offer many desirable characteristics for propulsion, water and space heating.Space solar power collectors have multiple advantages over earth-based solar power plants. They receive more sun light, are unaffected by weather, free from the day-night cycle, and expensive storage can be avoided. 1,2 The types of geometric designs, which have been developed for spacecraft solar collectors, are generally similar to those of terrestrial systems. They invariably feature an enclosure (cavity) in which the solar radiation initiates and sustains a circulation flow field. The thermo-physics inevitably involves all three modes of heat transfer (conduction, convection, and radiation) although the individual contributions may vary with the particular design adopted, as elaborated by Kreith. 3 Several studies have confined attention to thermal conduction and radiation in spacecraft solar collectors, including Yang et al, 4 who studied three-dimensional anisotropic conduction and a simple radiation network model for collectors in deep cold space. The key mechanism in fluid-based solar collec...

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“…The results indicate that both the Nusselt number and dimensionless entropy generation are increasing functions of the Rayleigh number and nanoparticle volume fraction of the nanofluid. Mejri et al (2016) studied fluid flow and heat transfer due to the natural convection within an inclined triangular cavity filled with water using Lattice Boltzmann method. They examined the effects of inclination angle and Rayleigh number on the streamlines, isotherms as well as Nusselt number.…”

Section: Introductionmentioning

confidence: 99%

Mesoscopic approach for simulating nanofluid flow and heat transfer in a finned multi-pipe heat exchanger

Liu

Bayati

Abbas

et al. 2019

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Purpose The lattice Boltzmann method is used to simulate the nanofluid flow and heat transfer inside a finned multi-pipe heat exchanger. Design/methodology/approach The heat exchanger is filled with CuO-water nanofluid. The Koo–Kleinstreuer–Li (KKL) model is used to estimate the dynamic viscosity and considering the Brownian motion in the simulation. On the other hand, the influence of nanoparticles’ shapes on the heat transfer rate is considered, and the best efficient shape is selected to be used in the investigation. Findings The Rayleigh number, nanoparticle concentration and the thermal arrangements of internal active fins and bodies are the governing parameters. In addition, the impacts of these two parameters on the nanofluid flow, heat transfer rate, local and total entropy generation and heatline visualization are analyzed, comprehensively. Originality/value The originality of this work is using of lattice Boltzmann method for simulation of nanofluid flow and heat transfer during natural convection in a heat exchanger. Furthermore, influence of the shape of nanoparticles on the thermo-physical properties of nanofluid is analyzed using Koo–Kleinstreuer–Li correlation.

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LBM simulation of natural convection in an inclined triangular cavity filled with water

Cited by 27 publications

References 14 publications

Free convection analysis in a Γ-shaped heat exchanger using lattice Boltzmann method employing second law analysis and heatline visualization

Free convection analysis in a Γ-shaped heat exchanger using lattice Boltzmann method employing second law analysis and heatline visualization

Computational study of heat transfer in solar collectors with different radiative flux models

Mesoscopic approach for simulating nanofluid flow and heat transfer in a finned multi-pipe heat exchanger

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