Experimental and numerical investigation of jet impingement cooling using extended jet holes

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

doi:10.1016/j.ijheatmasstransfer.2020.119945

Cited by 71 publications

(18 citation statements)

References 35 publications

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“…At a jet-target plate distance of 0.75 and with the base fully covered with metal foam, a heat transfer enhancement of 2.42 times was achieved at the cost of 1.67 times pressure drop. Tepe et al [68] performed a numerical and experimental investigation for heat transfer enhancement by using extended jet holes. The jet platetarget plate distance Z/Dj of 6 and the nozzle-target plate distance Gj/Dj were varied for values of 1, 2, 3, 4, and 5.…”

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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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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“…The performance of the heat transfer and the Nusselt number are associated with the cross-flow. The heat transfer to the surface raises the cross-flow [22]. As the H/D ratio raises, the cross-flow effect increases and hence decreases the effectiveness of the impingement cooling of the pressure side surface.…”

Section: Effect Of Height To Diameter Ratio (H/d)mentioning

confidence: 99%

“…Since the Reynolds number for velocity 12.6 m/s is higher than those at 6.4 m/s, this explains why Nusselt number for V1 is larger than those of V2. In addition, based on the expression of turbulence intensity in the literature [22], the turbulence intensity was correlated with the Reynolds number. Thus, the strong turbulence intensity of V1 renders its Nusselt number higher than that of V2.…”

Section: Effect Of Velocity Of Airmentioning

confidence: 99%

Experimental Investigation of the Effectiveness of Jet Impingement Cooling System on the Pressure Side of the Turbine Blade

Kamalulzaman

Azman

Musa

et al. 2021

ARFMTS

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The effectiveness of the jet impingement system on the turbine blade pressure side has been experimentally investigated. The effects of height-to-diameter ratio and air velocity on the effectiveness of jet impingement were studied. Experiments was performed under varying height-to-diameter ratios (H/D = 5, 10, 15, 20) where the distance from the nozzle to the pressure side surface ranged from 20, 40, 60 and 80 mm with a constant nozzle diameter of 4 mm. The Nusselt number is calculated to determine the cooling effect of the pressure side model surface. Experiments were also performed at varying air velocity at 6.4 m/s and 12.6 m/s. The findings revealed that there was no direct relationship between Nusselt number and H/D ratio where the optimum cooling impact at a velocity of 6.4 m/s was found to be at H/D=15, whereas at a velocity of 12.6 m/s it was found to be at H/D=5. The findings also reveal that the amount of Nusselts rises as the air velocity increases.

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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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Experimental and numerical investigation of jet impingement cooling using extended jet holes

Cited by 71 publications

References 35 publications

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

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

Experimental Investigation of the Effectiveness of Jet Impingement Cooling System on the Pressure Side of the Turbine Blade

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

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