Jet impingement cooling on a rib-roughened surface using extended jet holes

Tepe, Ahmet Ümit; Uysal, Ünal; Yetişken, Yaşar; Arslan, Kamil

doi:10.1016/j.applthermaleng.2020.115601

Cited by 40 publications

(16 citation statements)

References 33 publications

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“…Various researchers have carried out studies on the improvement of heat transfer using passive methods [1][2][3][4][5]. Li et al [6,7] numerically and experimentally studied the effect of using a vortex generator on increasing heat transfer in a finless heat exchanger.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Vortex Generators in the Heat Transfer Improvement of Airflow through an In-Line Heated Tube Arrangement

Syaiful

Wahyuni

Yunianto

et al. 2021

Fluids

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Improving heat transfer from surface to airflow is a current research concern for enhancing energy efficiency. The use of vortex generators for improving heat transfer from the surface to the airflow is very effective. Therefore, this study focuses on applying flat and concave vortex generators with and without holes in order to improve heat transfer. In this study, the number of pairs of vortex generators was varied from one to three pairs at a certain angle of attack for various forms of vortex generators. The airflow velocity through the duct was varied in the range of 0.4 to 2.0 m/s at 0.2 m/s intervals. From the investigation results, we observed that the highest thermal performance was found with the use of concave delta winglets without holes for various pairs of vortex generators in terms of the overall Reynolds number. The highest thermal enhancement factor was found to be around 1.42 at a Reynolds number of approximately 9000. From this study, it was also shown that the lowest cost–benefit ratio was about 1.75 at a Reynolds number of approximately 3500 for three pairs of vortex generators.

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Section: Introductionmentioning

confidence: 99%

Evaluation of Vortex Generators in the Heat Transfer Improvement of Airflow through an In-Line Heated Tube Arrangement

Syaiful

Wahyuni

Yunianto

et al. 2021

Fluids

View full text Add to dashboard Cite

show abstract

“…However, the distribution of Nu was more uniform along the surface in the presence of ribs. In another work, Tepe et al [59] performed an experimental and numerical investigation using extended jet holes to study the cooling performance by impinging a jet on a rib-roughened surface (see Figure 4a). The ratio of rib height to jet diameter (Hr/Dj) was considered as 0.42 for the experimental study, while for the numerical investigation, Hr/Dj = 0, 0.25, 0.42, and 0.58 were used.…”

Section: Pachpute and Premachandran [57]mentioning

confidence: 99%

Heat Transfer Augmentation through Different Jet Impingement Techniques: A State-of-the-Art Review

et al. 2021

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Jet impingement is considered to be an effective technique to enhance the heat transfer rate, and it finds many applications in the scientific and industrial horizons. The objective of this paper is to summarize heat transfer enhancement through different jet impingement methods and provide a platform for identifying the scope for future work. This study reviews various experimental and numerical studies of jet impingement methods for thermal-hydraulic improvement of heat transfer surfaces. The jet impingement methods considered in the present work include shapes of the target surface, the jet/nozzle–target surface distance, extended jet holes, nanofluids, and the use of phase change materials (PCMs). The present work also includes both single-jet and multiple-jet impingement studies for different industrial applications.

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“…Even for configurations containing more complexities, RANS computations have been applied, e.g. to assess possible heat transfer enhancements using application-based jet impingement over surfaces fitted with ribs, cavity and extended surfaces (Shukla and Dewan, 2017b; Tepe et al , 2019; Tepe, Uysal, et al , 2020; Tepe, Yetişken, et al , 2020; Wan et al , 2015). RANS computations performed reasonably well, resulting in confidence on their applicability from an engineering view point.…”

Section: Introductionmentioning

confidence: 99%

Computational analysis of convective heat transfer properties of turbulent slot jet impingement

Shukla

Dewan

2021

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Purpose Convective heat transfer features of a turbulent slot jet impingement are comprehensively studied using two different computational approaches, namely, URANS (unsteady Reynolds-averaged Navier–Stokes equations) and SAS (scale-adaptive simulation). Turbulent slot jet impingement heat transfer is used where a considerable heat transfer enhancement is required, and computationally, it is a quite challenging flow configuration. Design/methodology/approach Customized OpenFOAM 4.1, an open-access computational fluid dynamics (CFD) code, is used for SAS (SST-SAS k-ω) and URANS (standard k-ε and SST k-ω) computations. A low-Re version of the standard k-ε model is used, and other models are formulated for good wall-refined calculations. Three turbulence models are formulated in OpenFOAM 4.1 with second-order accurate discretization schemes. Findings It is observed that the profiles of the streamwise turbulence are under-predicted at all the streamwise locations by SST k-ω and SST SAS k-ω models, but follow similar trends as in the reported results. The standard k-ε model shows improvements in the predictions of the streamwise turbulence and mean streamwise velocity profiles in the zone of outer wall jet. Computed profiles of Nusselt number by SST k-ω and SST-SAS k-ω models are nearly identical and match well with the reported experimental results. However, the standard k-ε model does not provide a reasonable profile or quantification of the local Nusselt number. Originality/value Hybrid turbulence model is suitable for efficient CFD computations for the complex flow problems. This paper deals with a detailed comparison of the SAS model with URANS and LES for the first time in the literature. A thorough assessment of the computations is performed against the results reported using experimental and large eddy simulations techniques followed by a detailed discussion on flow physics. The present results are beneficial for scientists working with hybrid turbulence models and in industries working with high-efficiency cooling/heating system computations.

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Jet impingement cooling on a rib-roughened surface using extended jet holes

Cited by 40 publications

References 33 publications

Evaluation of Vortex Generators in the Heat Transfer Improvement of Airflow through an In-Line Heated Tube Arrangement

Evaluation of Vortex Generators in the Heat Transfer Improvement of Airflow through an In-Line Heated Tube Arrangement

Heat Transfer Augmentation through Different Jet Impingement Techniques: A State-of-the-Art Review

Computational analysis of convective heat transfer properties of turbulent slot jet impingement

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