Axisymmetric jet impingement on a dimpled surface: Effect of impingement location on flow field characteristics

Hout, R. van; Rinsky, V.; Sasson, N.; Hershcovich, C.; Tshuva, Moshe; Grobman, Yasha J.

doi:10.1016/j.ijheatfluidflow.2018.09.010

Cited by 13 publications

(1 citation statement)

References 31 publications

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“…Hout et al studied the flow characteristics of jets impinging on flat and dimpled surfaces due to jet impingement location using particle image velocimetry (PIV) measurements. The study was performed at different values of Reynolds numbers ( Re = 1352, 6268, and 12 342) at a constant jet‐to‐plate distance L / D = 4.8.…”

Section: Introductionmentioning

confidence: 99%

Characteristics of heat transfer of impingement system with swap swirl generator

Salman

2019

Heat Trans. Asian Res.

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This article presents the computational fluid dynamic simulation of the heat transfer characteristics induced by a swap swirl air-jet generator on the impingement surface. The study was carried out for conventional and swap twist tape inserts of twisted ratio y = 2.93 with various swap angles (α = 30°, 60°, 90°) at a constant distance of nozzle diameter impingement plate (L = 2D). The results show that the Nusselt number of the swirl impingement air-jet depends on the twisted tape swap angles and airflow rate. The results also showed that the swap angle of 90°gave notable uniform local heat transfer distribution compared with the typical twist tape and other swap twist tapes (α = 30°, 60°). In addition, the predicted results of the local heat transfer coefficient help explain the local turbulence intensity and generation to assist the industrial applications of swirl impingement air-cooling jet.

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Section: Introductionmentioning

confidence: 99%

Characteristics of heat transfer of impingement system with swap swirl generator

Salman

2019

Heat Trans. Asian Res.

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Numerical analysis of jet impingement cooling with elongated nozzle holes on a curved surface roughened with V-shaped ribs

Yalçınkaya,

Durmaz

2024

J Therm Anal Calorim

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Numerical studies were performed in this study to analyze the effect of dimensionless elongated injection holes (G/d = 0.5, 2.0, 4.0, 8.0) on heat and flow characteristics on rib-roughened surfaces with an array of inclined impingement jets. Experimental and numerical data from existing literature were used to validate the numerical solution procedure’s heat transfer and flow characteristics in the semicircular test section. The turbulence equations were solved using the SST k-ω turbulence model by varying the Reynolds number from 5000 to 25,000. The curvature effect and staggered array pattern created an additional stagnation region between adjacent impinging jets on smooth surfaces, leading to a low heat transfer zone. Rectangular cross-sectional V-shaped ribs (VSR) were placed in regions where the stagnation point occurs to eliminate this disadvantage. The effect of different normalized rib heights (Hr/d = 0, 0.2, 0.3, 0.4) and rib angles (α = 30°, 45°, 60°, 90°) on the curved surface was also investigated to increase convective heat transfer performance and achieve more homogenous heat transfer distribution by relatively reducing the effect of thermal stresses. Flow properties, area-averaged and local Nusselt number variations on smooth and ribbed surfaces, and the thermal performance criterion (TPC) were investigated in detail. The results indicated an increase in overall heat transfer and a more evenly distributed measurement region compared to the conventional (unextended jet and smooth surface) jet impingement configuration. The most significant heat transfer enhancement from combining the elongated jets with VSR was 47.23% at Hr/d = 0.2 by reducing the G/d to 0.5. In addition, the highest TPC was determined as 1.07 on the proposed model with G/d = 2.0 and Hr/d = 0.2 at Re = 25,000.

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Innovative impinging jet methods for performance enhancement: a review

Srivastav,

Maithani,

Sharma

2024

J Therm Anal Calorim

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Axisymmetric jet impingement on a dimpled surface: Effect of impingement location on flow field characteristics

Cited by 13 publications

References 31 publications

Characteristics of heat transfer of impingement system with swap swirl generator

Characteristics of heat transfer of impingement system with swap swirl generator

Numerical analysis of jet impingement cooling with elongated nozzle holes on a curved surface roughened with V-shaped ribs

Innovative impinging jet methods for performance enhancement: a review

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