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Research Papers: Jets, Wakes, and Impingment Cooling

Jet Impingement Heat Transfer in Narrow Channels With Different Pin Fin Configurations on Target Surfaces

[+] Author and Article Information
Yu Rao

Institute of Turbomachinery,
School of Mechanical Engineering,
Shanghai Jiao Tong University,
Dongchuan Road 800,
Shanghai 200240, China
e-mail: yurao@sjtu.edu.cn

1Corresponding author.

Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF HEAT TRANSFER. Manuscript received July 27, 2017; final manuscript received January 8, 2018; published online March 30, 2018. Assoc. Editor: Danesh K. Tafti.

J. Heat Transfer 140(7), 072201 (Mar 30, 2018) (10 pages) Paper No: HT-17-1432; doi: 10.1115/1.4039015 History: Received July 27, 2017; Revised January 08, 2018

A comparative experimental and numerical study has been done on multiple-jet impingement heat transfer in narrow channels with different pin fin configurations on the target surfaces. Three different target plates including a flat plate, a plate with full-height pin fins, and another plate with miniature pin fins are investigated in the jet impingement cooling systems comparatively. The experiments were done under maximum cross flow scheme for the jet Reynolds numbers from 15,000 to 30,000. Narrow jet impingement spacing is kept the same as 1.5 times jet diameter for all the target plates. In the experiments, detailed jet impingement heat transfer characteristics on the flat plate and the full-height pin-fin plate were obtained by using the transient liquid crystal thermography technique, and additionally steady experiments were done to obtain the overall heat transfer performance of the jet impingement systems with all the three different target plates, which accounts for the heat transfer contribution from the pin fins' surface. Significant overall jet impingement heat transfer enhancement can be obtained with full-height pin-fin roughened surfaces with appreciable pressure loss; however, with miniature pin fins on the target plate, the jet impingement overall heat transfer performance can be remarkably improved with negligible pressure loss penalty. Furthermore, three-dimensional (3D) computational fluid dynamics (CFD) analysis was done to analyze the detailed flow structure and heat transfer characteristics in the jet impingement systems with different pin fin configurations.

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References

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Figures

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Fig. 1

Double-wall cooling with pin fins for gas turbine blade [17]

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Fig. 2

A schematic of the experimental system

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Fig. 3

Jet impingement models with (a) flat target plate and (b) full-height pin-fin plate

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Fig. 4

Schematic of the target plate with mini pin fins

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Fig. 5

Picture of the plate with mini pin fins

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Fig. 6

Boundary conditions in the numerical computation

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Fig. 7

The mesh for numerical computations of jet impingement on (a) flat plate, (b) full-height pin-fin plate, and (c) mini-pin-fin plate

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Fig. 8

GCI analysis on spanwisely averaged Nusselt numbers on the endwall of full-height pin-fin plate

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Fig. 9

Comparisons of local Nusselt number on (a) flat plate, Nu¯¯ = 99.89 and (b) full-height pin-fin plate, Nu¯¯ = 100.55 at Re = 30,000

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Fig. 10

Spanwisely averaged Nusselt number ratios on (a) flat plate and (b) full-height pin-fin plate [18]

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Fig. 11

Comparisons of globally averaged Nusselt numbers of the target plates in the jet impingement systems (based on steady experiments' data)

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Fig. 12

Comparisons of transient and steady experimental data of jet impingement heat transfer on flat plate and full-height pin-fin plate

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Fig. 13

Overall heat transfer performance comparisons of the jet impingement systems with different target plates (based on steady experiments' data)

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Fig. 14

Comparisons of pressure loss of the jet impingement systems with different target plates

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Fig. 15

CFD results of local Nusselt numbers on the target plates on (a) flat plate, Nu¯¯ = 104.7, (b) full-height-pin-fin plate, Nu¯¯ = 105.5, and (c) mini-pin-fin plate, Nu¯¯ = 98.7 at Re = 30,000

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Fig. 16

Comparisons of CFD and experimental data of spanwisely averaged Nusselt numbers on (a) flat plate and (b) full-height pin-fin plate at Re = 30,000

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Fig. 17

The streamlines and local heat transfer on the target plates on (a) flat plate, (b) full-height-pin-fin plate, and (c) mini-pin-fin plate at Re = 30,000

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Fig. 18

Velocity ratio and streamlines in the longitudinal central plane on (a) flat plate, (b) full-height-pin-fin plate, and (c) mini-pin-fin plate at Re = 30,000

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Fig. 19

Vertical component of the velocity in the horizontal plane 1 mm away from the target plates on (a) flat plate, (b) full-height-pin-fin plate, and (c) mini-pin-fin plate at Re = 30,000

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Fig. 20

Flow rate distributions through the jet holes in the jet impingement systems at Re = 30,000

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