Assessment of thermal characteristics of square wavy plates

Hussain, Shafqat; Kalendar, Abdulrahim; Rafique, Muhammad Zeeshan; Oosthuizen, Patrick H.

doi:10.1002/htj.21798

Cited by 4 publications

(10 citation statements)

References 17 publications

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“…Through the numerical study of natural convection heat transfer on isothermal horizontal plates with triangular corrugations (continuous and spaced), Oosthuizen and Kalendar (2020) concluded that the inclusion of triangular corrugations, compared to the flat plate geometry, always increases the heat transfer rates, with a greater increase observed in geometries with spaced corrugations. Hussain et al (2020) numerically studied the natural convection in square horizontal plates with different types of elliptical and sinusoidal corrugations and in isothermal heating conditions. They concluded, in comparison to the flat plate geometry, that using corrugations increases the heat transfer rates (with greater increases observed in sinusoidal corrugations).…”

Section: Hff 339mentioning

confidence: 99%

Numerical and experimental study of natural convection heat transfer on flat and corrugated plates

Júnior

Coelho

Scalon

et al. 2023

HFF

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Purpose The purpose of this study is to numerically and experimentally investigate the natural convection heat transfer in flat plates and plates with square, trapezoidal and triangular corrugations. Design/methodology/approach This work is an extension of the previous studies by Verderio et al. (2021a, 2021b, 2021c, 2021d, 2022a). An experimental apparatus was built to measure the plates’ temperatures during the natural convection cooling process. Several physical parameters were evaluated through the experimental methodology. Free and open-source computational tools were used to simulate the experimental conditions and to quantitatively and qualitatively evaluate the thermal plume characteristics over the plates. Findings The numerical results were experimentally validated with reasonable accuracy in the range of studied RaLP for the different plates. Empirical correlations of Nu¯LPexp=f(RaLP), h¯conv=f(RaLP) and Nu¯LPexp⋅(A/AP)=f(RaLP), with good accuracy and statistical representativeness, were obtained for the studied geometries. The convective thermal efficiency of corrugated plates (Δη), as a function of RaLP, was also experimentally studied quantitatively. In agreement with the findings of Oosthuizen and Garrett (2001), the experimental and numerical results proved that the increase in the heat exchange area of the corrugations has a greater influence on the convective exchange and the thermal efficiency than the disturbances caused in the flow (which reduce h¯conv). The plate with trapezoidal corrugations presented the highest convective thermal efficiency, followed by the plates with square and triangular corrugations. It was also proved that the thermal efficiency of corrugated plates increases with RaLP. Practical implications The results demonstrate that corrugated surfaces have greater thermal efficiency than flat plates in heating and/or cooling systems by natural convection. This way, corrugated plates can reduce the dependence on auxiliary forced convection systems, with application in technological areas and Industry 4.0. Originality/value The empirical correlations obtained for the corrected Nusselt number and thermal efficiency for the corrugated plate geometries studied are original and unpublished, as well as the experimental validation of the developed three-dimensional numerical code.

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Section: Hff 339mentioning

confidence: 99%

Numerical and experimental study of natural convection heat transfer on flat and corrugated plates

Júnior

Coelho

Scalon

et al. 2023

HFF

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“…Two different heat fluxes were tested: Qwall = 1 × 10 5 Wm −2 and Qwall = 1 × 10 6 Wm −2 , resulting in Rayleigh numbers of Ra = 3.8 × 10 4 and Ra = 3.8 × 10 5 , respectively. Unlike previous works [5][6][7][8][9], we specifically address the transient regime, which can be most relevant for heat exchangers operating under real cooling conditions. For example an electronic device can be refrigerated by a tested surfaces in a submerged application.…”

Section: Geometry Impact On Natural Convection With Imposed Heat Fluxmentioning

confidence: 99%

“…Various methods employed for this purpose involve surface modifications, such as adding fins or utilizing small cavities or grooves. Several studies found in the literature [5][6][7][8][9] investigate the impact of surface modifications on enhancing free convection heat transfer processes. Generally, these studies examine surface modifications with configurations resembling waves, employing sinusoidal functions [10,11], evenly spaced geometries like triangular [8,12] or squared [9,13] patterns.…”

Section: Introductionmentioning

confidence: 99%

“…Several studies found in the literature [5][6][7][8][9] investigate the impact of surface modifications on enhancing free convection heat transfer processes. Generally, these studies examine surface modifications with configurations resembling waves, employing sinusoidal functions [10,11], evenly spaced geometries like triangular [8,12] or squared [9,13] patterns. These 2 of 28 works are often categorized based on modifications made to horizontal [11,12], vertical [6,9,10], or inclined surfaces [7,13], typically employing experimental and Computational Fluid Dynamics (CFD) techniques to analyze the problem.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

A Modified Enthalpic Lattice Boltzmann Method for Simulating Conjugate Heat Transfer Problems in Non-homogeneous Media

Matsuda,

Martins,

Moreira

et al. 2024

Preprint

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This paper introduces a new adaptation of the enthalpic lattice Boltzmann method (LBM) tailored to simulate the intricate dynamics of conjugate heat transfer in non-homogeneous media, showcasing considerable potential for enhancing heat exchanger designs. This approach expands upon the conventional enthalpic LBM framework by seamlessly incorporating tailored source terms, enabling precise representation of local and transient variations in the medium’s thermophysical properties. The resulting LBM model comprehensively captures the energy conservation equation, with exceptions made only for flow compressibility and viscous dissipation, thereby significantly augmenting its versatility in analyzing heat exchanger configurations. Verification tests, comprising assessments of both transient and steady-state solutions, unequivocally validate the accuracy of the proposed model, further bolstering its reliability for analyzing heat exchange processes within intricate heat exchanger geometries. To demonstrate its efficacy, simulations of conjugate heat transfer processes involving fluid natural convection within structured cavities were performed, imposing both Dirichlet and Neumann boundary conditions to emulate scenarios encountered in practical heat exchanger operations. The findings yield compelling insights, particularly in the transient regime, revealing the beneficial impact of structured cavities on enhancing heat transfer processes. These insights inform potential design optimizations for heat exchangers. The results emphasize the potential of the modified enthalpic LBM approach to elucidate complex heat transfer phenomena in non-homogeneous media and structured geometries, offering valuable implications for heat exchanger engineering and optimization.

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“…On the other hand, the use of corrugated plates, especially based on the conclusion of Oosthuizen and Garrett (2001), is a promising alternative for the optimization of cooling systems by natural convection, thereby motivating new research in the area. Also noteworthy are the numerical studies by Oosthuizen (2016a); Oosthuizen (2016b; Gibanov and Sheremet (2017); Gibanov and Sheremet (2019); Oosthuizen and Kalendar (2020); Hussain et al (2020) on the use of corrugated plates to improve natural convection heat transfer rates.…”

Section: Introductionmentioning

confidence: 99%

Numerical investigation of three-dimensional natural convection heat transfer on corrugated plates of variable height

Verdério Júnior,

Coelho,

Scalon

2024

HFF

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Purpose The purpose of this study is to numerically investigate the geometric influence of different corrugation profiles (rectangular, trapezoidal and triangular) of varying heights on the flow and the natural convection heat transfer process over isothermal plates. Design/methodology/approach This work is an extension and finalization of previous studies of the leading author. The numerical methodology was proposed and experimentally validated in previous studies. Using OpenFOAM® and other free and open-source numerical-computational tools, three-dimensional numerical models were built to simulate the flow and the natural convection heat transfer process over isothermal corrugation plates with variable and constant heights. Findings The influence of different geometric arrangements of corrugated plates on the flow and natural convection heat transfer over isothermal plates is investigated. The influence of the height ratio parameter, as well as the resulting concave and convex profiles, on the parameters average Nusselt number, corrected average Nusselt number and convective thermal efficiency gain, is analyzed. It is shown that the total convective heat transfer and the convective thermal efficiency gain increase with the increase of the height ratio. The numerical results confirm previous findings about the predominant effects on the predominant impact of increasing the heat transfer area on the thermal efficiency gain in corrugated surfaces, in contrast to the adverse effects caused on the flow. In corrugations with heights resulting in concave profiles, the geometry with triangular corrugations presented the highest total convection heat transfer, followed by trapezoidal and rectangular. For arrangements with the same area, it was demonstrated that corrugations of constant and variable height are approximately equivalent in terms of natural convection heat transfer. Practical implications The results allowed a better understanding of the flow characteristics and the natural convection heat transfer process over isothermal plates with corrugations of variable height. The advantages of the surfaces studied in terms of increasing convective thermal efficiency were demonstrated, with the potential to be used in cooling systems exclusively by natural convection (or with reduced dependence on forced convection cooling systems), including in technological applications of microelectronics, robotics, internet of things (IoT), artificial intelligence, information technology, industry 4.0, etc. Originality/value To the best of the authors’ knowledge, the results presented are new in the scientific literature. Unlike previous studies conducted by the leading author, this analysis specifically analyzed the natural convection phenomenon over plates with variable-height corrugations. The obtained results will contribute to projects to improve and optimize natural convection cooling systems.

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Assessment of thermal characteristics of square wavy plates

Cited by 4 publications

References 17 publications

Numerical and experimental study of natural convection heat transfer on flat and corrugated plates

Numerical and experimental study of natural convection heat transfer on flat and corrugated plates

A Modified Enthalpic Lattice Boltzmann Method for Simulating Conjugate Heat Transfer Problems in Non-homogeneous Media

Numerical investigation of three-dimensional natural convection heat transfer on corrugated plates of variable height

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