Enhanced Mixed Convection in a Vertical Channel by Addition of Staggered Inclined Baffles

Henniche, Rabah; Korichi, Abdelkader

doi:10.2514/1.t6037

Cited by 7 publications

(3 citation statements)

References 40 publications

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“…Numerical studies of convection in turbulent flows, in the most diverse applications, are strongly represented by the works of Shirvan et al (2016) with double pipe heat exchanger filled with porous media; Shirvan et al (2017) with solar cavity receiver with heat transfer by natural convection and radiation combined; Akbarzadeh et al (2018) with corrugated solar heaters of triangular and sinusoidal wall profiles and irreversibilities and multi-phase nanofluid flows; Mishra et al (2019) in the study of natural convection in generalized Newtonian fluids (power law and Bingham plastic) in an isothermal vertical cone; Hassan et al (2019) in the study of the flow of viscoelastic nanofluid under the influence of nanoparticles of different materials past around a vertical cone; Khan et al (2020) in the study of the effect of 2D Darcy-Forchheimer flow over second-grade fluid with linear stretching, using convective boundary conditions; Souayeh et al (2020) in the study of natural convection and entropy generation around a sphere within cuboidal enclosure; Elelamy et al (2020) in the investigation of a mathematical numeric model of study, where the blood flow of magnetohydrodynamics non-Newtonian nanofluid with heat transfer and slip effects is applied to bacterial growth in a heart valve; Majeed et al (2020) in the numerical study of the activation energy of chemically reactive heat transfer unsteady flow with multiple slips; Dash and Dash (2020) in a horizontal cylinder suspended in the air with combined heat transfer by natural convection and radiation; and Henniche and Korichi (2020) in the use of software OpenFOAMV R in the modeling and study of heat transfer by enhanced mixed convection in a vertical channels with the addition of staggered inclined baffles.…”

Section: Parameters In Turbulent Simulationsmentioning

confidence: 99%

Physical–numerical parameters in turbulent simulations of natural convection on three-dimensional square plates

Júnior¹,

Scalon

Oliveira

et al. 2021

HFF

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Purpose This paper aims to study, experimentally validate and select the main physical and numerical parameters of influence in computational numerical simulations to evaluate mean heat flux by natural convection on square flat plates. Design/methodology/approach Several numerical models were built to study the influence of physical and numerical parameters about the predictions of the natural convection heat transfer rates on the surface of a flat plate with aspect ratio = 1, in isothermal conditions, turbulent regime and using the free and open-source software OpenFOAM®. The studied parameters were: boundary conditions (using or not using wall functions in properties ε, κ, νt and ω), degree of mesh refinement, refinement layers and turbulence models [κ – ε and κ – ω Shear Stress Transport (SST)]. From the comparison of the values of the mean Nusselt number, obtained from numerical simulations and literature experimental results, the authors evaluated the precision of the studied parameters, validating and selecting the most appropriate to the analyzed problem situation. Findings The validation and agreement of the numerical results could be proven with excellent precision from experimental references of the technical scientific literature. More refined meshes with refinement layers were not suitable for the studies developed. The κ – ε and κ – ω SST turbulence models, in meshes without refinement layers, proved to be equivalent. Whether or not to use wall functions in turbulent boundary conditions proved to be irrelevant as to the accuracy of results for the problem situation studied. Practical implications Use of the physical and numerical parameters is studied and validated for various applications in natural convection heat transfer of technology and industry areas. Social implications Use of free and open-source software as a research tool in the Computational Fluid Dynamics (CFD) area, especially in conditions without large financial resources or state-of-the-art infrastructure. Originality/value To the best of the authors’ knowledge, this work is yet not available in existing literature.

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Section: Parameters In Turbulent Simulationsmentioning

confidence: 99%

Physical–numerical parameters in turbulent simulations of natural convection on three-dimensional square plates

Júnior¹,

Scalon

Oliveira

et al. 2021

HFF

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“…The state of the art of natural convection numerical studies, in the most diverse applications and methodologies of modeling and solution, is broadly represented by the references (Salari et al , 2017) in the three-dimensional study of turbulent/transitional natural convection with different turbulence/transition models in trapezoidal enclosures (Dash and Dash, 2020). In the analysis of conjugate heat transfer by natural convection and thermal radiation in a horizontal cylinder that is suspended in the air; (Lukose and Basak, 2020) in the study of natural convection through the Galerkin finite element method in nine different shapes of containers, with the same surface area and identical isothermal heat input at the bottom wall; (Henniche and Korichi, 2020) in the study and numerical simulation (using the software OpenFOAM®) of enhanced mixed convection heat transfer in a vertical channel with staggered inclined baffles; Raizah (2020) in the application of the ISPH method for the study of natural convection with copper-water nanofluid inside cavities with cross blades or circular cylinder cylinder; Alshomrani et al (2020) in the three-dimensional study of the influence of different locations of cooler and the tilting angles of a cavity on natural convection heat transfer in a laminar regime; Aghighi et al (2020) in obtaining solutions, through the Galerkin’s weighted residual finite element method, of the natural convection of Casson fluid in a square enclosure, under conditions of differentially heated side walls; Sasidharan and Dutta (2020) in the study of the thermal performance of a hybrid tubular and cavity solar thermal receiver; Ullah et al (2021) in the two-dimensional study of natural convection of micropolar nanofluid in a rectangular vertical container, heated on the lower wall to generate the internal flow; Lukose and Basak (2021) in the extensive literature review on the mixed convection and the proposition of 10 unified models in different physical–numerical conditions; and Nishad et al (2021) in the two-dimensional study of natural convection inside a wavy enclosure with Cu-water nanofluid under magnetic field and using the element-free Galerkin method (EFGM) with parallel algorithm.…”

Section: Introductionmentioning

confidence: 99%

Physical–numerical parameters in laminar simulations of natural convection on three-dimensional square plates

Júnior¹,

Scalon

Oliveira

2021

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Purpose The purpose of this study is to analyze the influence of the main physical–numerical parameters in the computational evaluation of natural convection heat transfer rates in isothermal flat square plates in the laminar regime. Moreover by experimentally validate the results of the numerical models and define the best parameter settings for the problem situation studied. Design/methodology/approach The present work is an extension of the study by Verderio Junior et al. (2021), differing in the modeling, results analysis and conclusions for the laminar flow regime with Rade=1×105. The analysis of the influence and precision of the physical–numerical parameters: boundary conditions, degree of mesh refinement, refinement layers and κ – ω SST and κ – ε turbulence models, occurred from the results from 48 numerical models, which were simulated using the OpenFOAM® software. Comparing the experimental mean Nusselt number with the numerical values obtained in the simulations and the analysis of the relative errors were used in the evaluation of the advantages, restrictions and selection of the most adequate parameters to the studied problem situation. Findings The numerical results of the simulations were validated, with excellent precision, from the experimental reference by Kitamura et al. (2015). The application of the κ – ω SST and κ – ε turbulence models and the boundary conditions (with and without wall functions) were also physically validated. The use of the κ – ω SST and κ – ε turbulence models, in terms of cost-benefit and precision, proved to be inefficient in the problem situation studied. Simulations without turbulence models proved to be the best option for the physical model for the studies developed. The use of refinement layers, especially in applications with wall functions and turbulence models, proved unfeasible. Practical implications Use of the physical–numerical parameters studied and validated, and application of the modeling and analysis methodology developed in projects and optimizations of natural convection thermal systems in a laminar flow regime. Just like, reduce costs and the dependence on the construction of experimental apparatus to obtain experimental results and in the numerical-experimental validation process. Social implications Exclusive use of free and open-source computational tools as an alternative to feasible research in the computational fluid dynamics area in conditions of budget constraints and lack of higher value-added infrastructure, with applicability in the academic and industrial areas. Originality/value The results and discussions presented are original and new for the applied study of laminar natural convection in isothermal flat plate, with analysis and validation of the main physical and numerical influence parameters.

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“…Their findings suggest that the best nanofluid configuration that yields the highest transfer performance is characterized by a lower aspect ratio, a lower magnetic field and a heat source placed at the end of the undermost wall. Through numerical investigation, Henniche and Korichi (2020) explored the improvement of heat transfer and unsteady mixed convective flow in a vertical channel by addition of an inclined baffles arranged in staggered manner. The heat transfer enhancement has been evaluated for both steady-state fluid flow and unsteady, selfsustaining flow under the influence of buoyancy.…”

Section: Hff 342mentioning

confidence: 99%

Baffle effects on enhancing cooling performance of electronic components by nanofluid in a horizontal channel

Armou

Hssain

Nouari

et al. 2023

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Purpose The purpose of this study is to investigate the impact of varying baffle height and spacing distance on heat transfer and cooling performance of electronic components in a baffled horizontal channel, using a Cu-H2O nanofluid under mixed convection and laminar flow. Design/methodology/approach The mathematical model is two-dimensional and comprises a system of four governing equations, such as the conservation of continuity, momentum and energy. To obtain numerical solutions for these equations, the finite volume method was used for discretization. A validation process was performed by comparing this study’s results with those of previously published studies. The comparison revealed a close agreement. The numerical study was performed for a wide range of key parameters: The baffle height (0 ≤ h ≤ 0.7), the spacing distance between baffle and blocks (0.25 ≤ w ≤ 3), the Grashof and Reynolds numbers are kept equal to 104 and 75, respectively, the channel aspect ratio is L/H = 10, and the volume fraction of Cu nanoparticles is fixed at φ = 5%. Findings The results of the study reveal a significant improvement in heat transfer in terms of total Nusselt number of the top and bottom hot components, which exhibited an improvement of 16.89% and 17.23% when the baffle height increases from h = 0 to h = 0.7. Additionally, the study found that reducing the distance between the baffle and the electronic components up to a certain limit can improve the heat transfer rate. Therefore, the optimal height of the baffle was found to be no lower than 0.6, and the recommended distance between the heaters and the baffle was 0.5. Originality/value This study provides valuable insights into the optimization of the design of baffled channels for improved heat transfer performance. The findings of study can be used to improve heat exchangers and cooling systems in various applications. The use of Cu-H2O nanofluid under mixed convection and laminar flow conditions in channel with baffle and electronic components is also unique, making this study an original contribution to the field.

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Enhanced Mixed Convection in a Vertical Channel by Addition of Staggered Inclined Baffles

Cited by 7 publications

References 40 publications

Physical–numerical parameters in turbulent simulations of natural convection on three-dimensional square plates

Physical–numerical parameters in turbulent simulations of natural convection on three-dimensional square plates

Physical–numerical parameters in laminar simulations of natural convection on three-dimensional square plates

Baffle effects on enhancing cooling performance of electronic components by nanofluid in a horizontal channel

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