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Research Papers: Jets, Wakes, and Impingment Cooling

Turbulent Heat Transfer From a Slot Jet Impinging on a Flat Plate

[+] Author and Article Information
Dahbia Benmouhoub

e-mail: benmouhoub_d@yahoo.com

Amina Mataoui

e-mail: amataoui@gmail.com
Laboratoire de Mécanique des Fluides
Théorique et Appliquée,
Faculté de Physique,
Université des sciences et de la
technologie Houari Boumediene,
B.P. 32, Bab Ezzouar,
16111 Al Alia, Alger, Algérie

Contributed by the Heat Transfer Division of ASME for publication in the Journal of Heat Transfer. Manuscript received July 3, 2012; final manuscript received May 3, 2013; published online August 19, 2013. Assoc. Editor: Wilson K. S. Chiu.

J. Heat Transfer 135(10), 102201 (Aug 19, 2013) (9 pages) Paper No: HT-12-1353; doi: 10.1115/1.4024554 History: Received July 03, 2012; Revised May 03, 2013

The flow field and heat transfer of a plane impinging jet on a hot moving wall were investigated using one point closure turbulence model. Computations were carried out by means of a finite volume method. The evolutions of mean velocity components, vorticity, skin friction coefficient, Nusselt number and pressure coefficient are examined in this paper. Two parameters of this type of interaction are considered for a given impinging distance of 8 times the nozzle thickness (H/e = 8): the jet-surface velocity ratio and the jet exit Reynolds number. The flow field structure at a given surface-to-jet velocity ratio is practically independent to the jet exit Reynolds number. A slight modification of the flow field is observed for weak surface-to-jet velocity ratios while the jet is strongly driven for higher velocity ratio. The present results satisfactorily compare to the experimental data available in the literature for Rsj ≤ 1.The purpose of this paper is to investigate this phenomenon for higher Rsj values (0 ≤ Rsj ≤ 4). It follows that the variation of the mean skin friction and the Nusselt number can be correlated according to the surface-to-jet velocity ratios and the Reynolds numbers.

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References

Figures

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Fig. 1

Configuration and parameters

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Fig. 2

Effect of grid refinement on the local Nusselt number along the moving wall

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Fig. 3

Mean velocities components U/Vj and V/Vj. (H/e = 8, Re = 7850; (a), Rsj = 0, (b) Rsj = 0.25, (c) Rsj = 0.5, and (d) Rsj = 1.

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Fig. 4

Streamlines contours: Effect of plate—velocity ratio H/e = 8, Re = 10,600 and 0 ≤ Rsj ≤ 4

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Fig. 5

Pressure coefficient along the moving wall: Effect of plate—velocity ratio H/e = 8, Re = 10,600 and 0 ≤ Rsj ≤ 4

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Fig. 6

Vorticity contours: Effect of plate—velocity ratio

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Fig. 7

Skin friction coefficient: Effect of plate—velocity ratio H/e = 8, Re = 10,600 and 0 ≤ Rsj≤ 4 (a) 0 ≤ Rsj ≤ 4; (b) 0 ≤ Rsj ≤ 1; (c) 1.25 ≤ Rsj ≤ 1.75; and (d) 2 ≤ Rsj ≤ 4

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Fig. 8

Mean skin friction coefficient H/e = 8

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Fig. 9

Validation: Effect of Rsj on the local Nusselt number along the hot wall

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Fig. 10

Distribution of local Nusselt number for H/e = 8, Re = 10,600 and 0 ≤ Rsj ≤ 4 (a) Along hot moving wall and (b) for −20 ≤ x/e ≤ 20

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Fig. 11

Average Nusselt number distribution for H/e = 8

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