Fluid flow and heat transfer of natural convection adjacent to upward-facing, rectangular plates of arbitrary aspect ratios

Kitamura, Keiichi; Mitsuishi, Akihiko; Suzuki, Takashi; Kimura, Fumihiko

doi:10.1016/j.ijheatmasstransfer.2015.05.075

Cited by 25 publications

(35 citation statements)

References 13 publications

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“…The evaluation of the mean Nusselt number over the entire plate in the numerical simulations occurs through equation ( 23)obtained from the definition of Nusselt number and Newton's law of cooling, according to Incropera et al (2008) and also the use of the equivalent diameter as the characteristic length of Kitamura et al (2015):…”

Section: Numerical Model and Results Validationmentioning

confidence: 99%

“…The studied parameters were the boundary conditions (using or not using wall functions in properties « , k , t and v ), degree of mesh refinement, refinement layers and turbulence models (k -« or kv SST). The experimental data by Kitamura et al (2015) were used as references for validation and HFF 32,2 comparative precision of the numerical results obtained. From the experimental validation and analysis of the results, one can understandin a practical, applied and joint waythe influence of the studied parameters on the precision of the numerical results obtained and it was also possible to define the most appropriate parameters for the problem situation treated.…”

Section: Parameters In Turbulent Simulationsmentioning

confidence: 99%

“…Turbulent flow with Ra de ¼ 2 Â 10 8 , according to classification of Kitamura et al (2015). This condition was obtained through numerical and virtual adjustment of the gravity accelerationas shown in Table 1.…”

Section: Governing Equationsmentioning

confidence: 99%

“…Studies of Kitamura et al (2015) experimentally investigated the airflow and heat transfer rates in natural convection on heated horizontal isothermal flat plates (with AR equal of 1, 2, 3, 5 and 8), and in the laminar, turbulent transition and total turbulent flows.…”

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confidence: 99%

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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: Numerical Model and Results Validationmentioning

confidence: 99%

Section: Parameters In Turbulent Simulationsmentioning

confidence: 99%

Section: Governing Equationsmentioning

confidence: 99%

mentioning

confidence: 99%

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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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“…Rabari et al [12] investigated the effect of convection heat transfer on performance of waste heat thermoelectric generator. Many researchers [13][14][15] studied the nature convection, and many researchers focused on the forced convective heat transfer. Aydin et al [16] studied laminar forced convective slip flow in a micro-tube subject with an axially varying heat flux by using the finite volume method.…”

Section: Introductionmentioning

confidence: 99%

Temperature distribution of a test specimen with high-speed heat air-flow passing through

Xiong¹,

Li²,

Dong³

2018

Therm sci

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In this paper, a solution method for the temperature distribution of rectangular test specimen with a high-speed heat air-flow passing through is proposed based on the heat transfer theory and numerical calculation, and the feasibility of temperature prediction method is validated. Firstly, the partial differential equations to describe the average temperature in the section of the hot air-flow and the specimen are established and the solving method using MATLAB solver is proposed. Then, based on heat transfer conduction equation and the average temperature, the temperature distribution at different point in each section is calculated. The comparison between numerical computation and experiment shows that two results are in good agreement, which verifies the correctness of the presented prediction method of the temperature distribution of the specimen.

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The boundary layer conductance of inclined elliptical leaves under free convection

Graefe

Grosch

Bitterlich

2022

Agricultural and Forest Meteorology

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Fluid flow and heat transfer of natural convection adjacent to upward-facing, rectangular plates of arbitrary aspect ratios

Cited by 25 publications

References 13 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

Temperature distribution of a test specimen with high-speed heat air-flow passing through

The boundary layer conductance of inclined elliptical leaves under free convection

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