Heat Transfer and Flow Characteristics of Jets Impinging on a Concave Hemispherical Plate

Hrycak, P.

doi:10.1615/ihtc7.1970

Cited by 20 publications

(10 citation statements)

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“…The statistical parameters of turbulence in the stagnant zone of the impinging jet were reported by Nishino et al [9]. Lee et al [10][11][12] conducted a lot of experimental works about the heat transfer of a impinging jet on a convex surface, and the effect of Reynolds number (11,000-50,000), the nozzle-tosurface (2)(3)(4)(5)(6)(7)(8)(9)(10) and the concave surface curvature (0.034-0.089) on the heat transfer was investigated. Geers et al [13][14][15][16] experimentally studied the impinging jet arrays.…”

Section: Introductionmentioning

confidence: 97%

“…Hrycak [2,3] at a comparatively early period investigated heat transfer of air jets impinging on a concave surfaces, and the effect of curvature on the heat transfer and flow was discussed; moreover, the flow field on the plate was studied experimentally. The numerical research on the laminar and turbulent impinging jet was overviewed by Polat et al [4].…”

Section: Introductionmentioning

confidence: 99%

“…Jambunathan et al [5] summarized the single impinging jet experiments for the range of Reynolds numbers (Rej = 5000-124,000) and the ratio of jet-to-plate spacing (L) and jet diameter (Dj) (L/Dj = 1. [2][3][4][5][6][7][8][9][10][11][12][13][14][15][16]. The Nusselt number correlation was derived with L/Dj and r/Dj {r, the distance from stagnation point, r = 0 is the right location on the plate corresponding to stag- nation point of dimple) based on the experimental data.…”

Section: Introductionmentioning

confidence: 99%

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Flow and Heat Transfer Characteristics of Single Jet Impinging on Dimpled Surface

Xie¹,

Li²,

Lan³

et al. 2013

Journal of Heat Transfer

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Flow and Heat Transfer Characteristics of Single Jet Impinging on Dimpled SurfaceBased on combined particle image velocimetry (PIV) and numerical simulation, the flow and heat transfer characteristics of a single jet impinging on a dimpled surface for D/ D = 0.318. 0.5. 1.045; ô/D = 0.1, 0.2, 0.3; Rej = 5000. 10.000,23,000, were investigated for the first time. The distance between jet nozzle and plate was fi.xed and equal to H/D = 2. The results show that the flow structures of the single jet impingement with dimpled target surface can be summarized into three typical conceptual flow structures. Particularly, the third flow structure in the form of a large toroidal vortex bound up with the dimple is the result of the centrifugal force of the flow deflection at the stagnation region and spherical centrifugal force of the deep dimple surface. The heat transfer area increases when the dimple relative depth increases. For the cases of D/D = 0.318 and 0.5. the area increasing dominate the heat transfer process, and the average Nusselt number increases with the increasing of dimple relative depth. For the cases with Dy/D = 1.045, the local Nusselt number reduction dominate the heat transfer process, the average Nusselt number decreases with the increasing of dimple relative depth. The average Nusselt number of the Dj/D = 0.318 and 0.5 cases is larger than the baseline case, while those of the DjiD = 1.045 cases are smaller than the baseline case. Furthermore, the correlative expressions of the local Nusselt number, stagnation points Nusselt number and average Nusselt number are obtained.

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Section: Introductionmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Flow and Heat Transfer Characteristics of Single Jet Impinging on Dimpled Surface

Xie¹,

Li²,

Lan³

et al. 2013

Journal of Heat Transfer

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“…Chupp et al [18] studied the heat transfer characteristics with an array of round jets impinging on a concave surface. Hrycak [19] reported the air-jet impingement on the concave semi-cylindrical plate with a row of jets and obtained the heat transfer coefficients. The heat transfer process of the air-jet impingement on a curved surface was reviewed by Gau and Chung [20].…”

Section: Introductionmentioning

confidence: 99%

Experimental and Numerical Study on Heat Transfer with Impinging Circular Jet on a Convex Hemispherical Surface

Zhang

2007

Heat Transfer Engineering

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In this paper, the experimental and numerical study has been carried out to investigate the water jet impingement on a convex hemispherical surface. The pressure and skin friction coefficient distributions on the impingement surface were analyzed numerically. A great deal of attention was paid to analyze the effects of the jet impingement exit velocity and the nozzle-tosurface distance on the heat transfer characteristics. A comparison of the heat transfer coefficient was performed between the jet impingement on the convex surface and the flat plate. The results show that the Nusselt number for the convex surface is higher than that for the flat surface. The local Nusselt number is decreased monotonically from its maximum value at the stagnation point for lower Reynolds numbers. A secondary maxima occurs for higher Reynolds numbers. The experiment and simulation were performed with the following parameters: the jet impingement Reynolds number of Re = 1947-19478, and the nozzle-to-surface distance of L/D = 2.5-25.

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“…Metzger et al (1972) and Bunker and Metzger (1990) studied heat‐transfer characteristics for different leading edge shapes of the cooled surfaces. Hrycak (1981, 1982) reported that the total heat transfer at the stagnation point on the concave surface is higher than that for the flat‐surface geometry because of a larger surface area, especially for small nozzle‐to‐surface distances. Gau and Chung (1991) visualized the jet flow impinging on both convex and concave semicircular surfaces at Reynolds numbers from 6000 to 35,000 and slot width–to‐surface diameter ratios of 8–45.…”

Section: Introductionmentioning

confidence: 99%

Impinging jet cooling on concave surfaces

2004

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Heat Transfer and Flow Characteristics of Jets Impinging on a Concave Hemispherical Plate

Cited by 20 publications

References 0 publications

Flow and Heat Transfer Characteristics of Single Jet Impinging on Dimpled Surface

Flow and Heat Transfer Characteristics of Single Jet Impinging on Dimpled Surface

Experimental and Numerical Study on Heat Transfer with Impinging Circular Jet on a Convex Hemispherical Surface

Impinging jet cooling on concave surfaces

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