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Research Papers: Jets, Wakes, and Impingment Cooling

Assessment of Heat Transfer Enhancement Using Metallic Porous Foam Configurations in Laminar Slot Jet Impingement: An Experimental Study

[+] Author and Article Information
Chinige Sampath Kumar

Department of Mechanical Engineering,
Indian Institute of Technology Madras,
Chennai 600036, India
e-mail: nanisampath@gmail.com

Arvind Pattamatta

Department of Mechanical Engineering,
Indian Institute of Technology Madras,
Chennai 600036, India
e-mail: arvindp@iitm.ac.in

1Corresponding author.

Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF HEAT TRANSFER. Manuscript received January 17, 2017; final manuscript received June 11, 2017; published online September 6, 2017. Assoc. Editor: Guihua Tang.

J. Heat Transfer 140(2), 022202 (Sep 06, 2017) (10 pages) Paper No: HT-17-1024; doi: 10.1115/1.4037540 History: Received January 17, 2017; Revised June 11, 2017

An experimental study using the liquid crystal thermography technique is conducted to investigate the convective heat transfer performance in jet impingement cooling using various porous media configurations. Aluminum porous foams are used in the present study. Four impinging jet configurations are considered: jet impingement (1) without porous media, (2) over the porous heat sink, (3) with porous obstacle case, and (4) through porous passage. These configurations are evaluated on the basis of the convective heat transfer enhancement for two different Reynolds numbers of 400 and 700. Jet impingement with porous heat sink showed deterioration in the average Nusselt number by 9.95% and 18.04% compared to jet impingement without porous media configuration for Reynolds numbers of 400 and 700, respectively. Jet impingement with porous obstacles showed a very negligible enhancement in the average Nusselt number by 3.48% and 2.73% for Reynolds numbers of 400 and 700, respectively. However, jet impingement through porous passage configuration showed a maximum enhancement in the average Nusselt number by 52.71% and 74.68% and stagnation Nusselt numbers by 58.08% and 53.80% compared to the jet impingement without porous medium for Reynolds numbers of 400 and 700, respectively. Within the porous properties considered, it is observed that by decreasing the permeability and porosity the convective heat transfer performance tends to increase.

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References

Figures

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Fig. 1

Jet impingement configurations with the inclusion of porous media: (a) heat sink, (b) porous obstacle, and (c) porous passage

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Fig. 2

Experimental test facility

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Fig. 3

Photograph of the aluminum foams: (a) sample 1 and (b) sample 2

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Fig. 4

Pressure gradient versus the inlet velocity

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Fig. 5

Photographs of jet impingement configurations involving porous media: (a) heat sink, (b) porous obstacle, and (c) porous passage

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Fig. 6

Process flow diagram

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Fig. 8

Validation of the local Nusselt number spatial variation for different Reynolds numbers: (a) Re = 448, (b) Re = 648, and (c) Re = 918

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Fig. 9

Schematic of the slot jet impingement flow field

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Fig. 10

Nusselt number variation in spanwise direction for Reynolds number of 400

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Fig. 11

Nusselt number variation in spanwise direction for Reynolds number of 700

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Fig. 12

Nusselt number contours for jet impingement configurations: (a) without porous media t = 21 s, (b) heat sink t = 24 s, (c) porous obstacle t = 20 s, and (d) porous passage for a Reynolds number, Re = 400 t = 16 s

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Fig. 13

Scaling of the Nusselt number variation for jet impingement: (a) without porous medium, (b) porous heat sinks, (c) porous obstacle, and (d) porous passage

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Fig. 14

Velocity profiles across the slot jet measured at a distance of 12 mm from the jet exit (stagnation point): (a) Re = 400 and (b) Re = 700

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Fig. 15

Comparison of pumping power for different configurations for different Reynolds number: (a) Re = 400 and (b) Re = 700

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