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Research Papers: Jets, Wakes, and Impingment Cooling

Convective Heat Transfer Investigation of a Confined Air Slot-Jet Impingement Cooling on Corrugated Surfaces With Different Wave Shapes

[+] Author and Article Information
Recep Ekiciler

Mechanical Engineering Department,
Gazi University,
Ankara 06570, Turkey
e-mail: recepekiciler@gazi.edu.tr

Muhammet Samet Ali Çetinkaya

Mechanical Engineering Department,
Karabuk University,
Karabuk 78050, Turkey
e-mail: sametalicetinkaya@gmail.com

Kamil Arslan

Mechanical Engineering Department,
Karabuk University,
Karabuk 78050, Turkey
e-mail: kamilarslan@karabuk.edu.tr

1Corresponding author.

Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF HEAT TRANSFER. Manuscript received June 14, 2018; final manuscript received October 23, 2018; published online December 13, 2018. Assoc. Editor: Amy Fleischer.

J. Heat Transfer 141(2), 022202 (Dec 13, 2018) (7 pages) Paper No: HT-18-1394; doi: 10.1115/1.4041954 History: Received June 14, 2018; Revised October 23, 2018

In this study, air jet impingement on flat, triangular-corrugated, and sinusoidal-corrugated surfaces was numerically investigated. Bottom surface was subjected to constant surface temperature. Air was the working fluid. The air exited from a rectangular shaped slot and impinged on the bottom surface. The Reynolds number was changed between 125 and 500. The continuity, momentum, and energy equations were solved using the finite volume method. The effect of the shape of bottom surface on heat and flow characteristics was investigated in detail. Average and local Nusselt number were calculated for each case. It was found out that Nusselt number increases by increasing the Reynolds number. The optimum conditions were established to get much more enhancement in terms of performance evaluation criterion (PEC). It was revealed that the shape of the cooling surface (bottom wall) influences the heat transfer substantially.

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References

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Figures

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Fig. 1

Schematic of the problem with different bottom wall geometry

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Fig. 2

Computational domain and grid representation

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Fig. 3

Comparison of (a) the local Nusselt number and (b) the maximum Nusselt number distribution with Refs. [23] and [24]

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Fig. 4

The effect of the shape of hot surface on the average Nusselt number for different Reynolds numbers

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Fig. 5

The effects of shape of hot surface and Reynolds number on the local Nusselt number

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Fig. 6

The effects of shape of hot surface and Reynolds number on the local pressure coefficient

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Fig. 7

Pumping power distribution for different shapes of the hot surface and Reynolds number

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Fig. 8

The effects of shape of hot surface and Reynolds number on the PEC distribution

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Fig. 9

Temperature and velocity distributions on the flat hot surface for different Reynolds numbers: (a) Re = 125, (b) Re = 250, (c) Re = 375, and (d) Re = 500

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Fig. 10

Temperature and velocity distributions on the triangular hot surface for different Reynolds numbers: (a) Re = 125, (b) Re = 250, (c) Re = 375, and (d) Re = 500

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Fig. 11

Temperature and velocity distributions on the sinusoidal hot surface for different Reynolds numbers: (a) Re = 125, (b) Re = 250, (c) Re = 375, and (d) Re = 500

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Fig. 12

Velocity streamlines on the (a) flat, (b) triangular, and (c) sinusoidal hot surfaces for Re = 500

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Fig. 13

Velocity vectors on the (a) flat, (b) triangular, and (c) sinusoidal hot surfaces for Re = 500

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Fig. 14

Temperature distribution on the (a) flat, (b) triangular, and (c) sinusoidal hot surfaces for Re = 500

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