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Research Papers: Jets, Wakes, and Impingment Cooling

Optimum Jet-to-Plate Spacing of Inline Impingement Heat Transfer for Different Crossflow Schemes

[+] Author and Article Information
Yunfei Xing

State Key Laboratory of High Temperature Gas Dynamics (LHD),
Institute of Mechanics,
Chinese Academy of Sciences,
100190 Beijing, China
e-mail: xingyunfei@imech.ac.cn

Bernhard Weigand

Institut für Thermodynamik der Luft-und Raumfahrt (ITLR),
Universität Stuttgart,
Pfaffenwaldring 31,
70569 Stuttgart, Germany

Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF HEAT TRANSFER. Manuscript received September 26, 2011; final manuscript received January 9, 2013; published online June 17, 2013. Assoc. Editor: Phillip M. Ligrani.

J. Heat Transfer 135(7), 072201 (Jun 17, 2013) (8 pages) Paper No: HT-11-1459; doi: 10.1115/1.4023562 History: Received September 26, 2011; Revised January 09, 2013

A nine-by-nine jet array impinging on a flat plate at Reynolds numbers from 15,000 to 35,000 has been studied by the transient liquid crystal method. The spacing between the impingement plate and target plate is adjusted to be 1, 2, 3, 4, and 5 jet diameters. The effect of jet-to-plate spacing has been investigated for three jet-induced crossflow schemes, referred as minimum, medium, and maximum crossflow, correspondingly. The local air jet temperature is measured at several positions on the impingement plate to account for an appropriate reference temperature of the heat transfer coefficient. The jet-to-plate spacing, H/d = 3, is found to be better than the others for all the crossflow schemes. Jet-to-plate spacings H/d = 1 and H/d = 2 result in a sudden decrease in the stagnation zone. The large jet-to-plate spacings H/d = 4 and H/d = 5 could not provide higher heat transfer performance with higher crossflow.

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Figures

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Fig. 1

Effect of jet-to-plate spacing on area-averaged Nusselt number for inline arrays with different jet-to-jet spacings at a Reynolds number of around 10,000 (numbers in brackets indicate jet-to-jet spacings (X/d, Y/d))

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Fig. 2

Sketch of the experimental setup

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Fig. 3

The impingement model

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Fig. 4

The inline impingement pattern and positions of thermocouples

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Fig. 5

The crossflow schemes

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Fig. 6

Measured temperature evolution of thermocouples

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Fig. 7

Local Nusselt number distribution (maximum crossflow, Re = 35,000)

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Fig. 8

Spanwise-averaged Nusselt number (maximum crossflow, Re = 35,000)

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Fig. 9

Normalized area-averaged Nusselt numbers for maximum crossflow

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Fig. 10

Local Nusselt number distribution (medium crossflow, Re = 35,000)

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Fig. 11

Spanwise-averaged Nusselt number (medium crossflow, Re = 35,000)

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Fig. 12

Area-averaged Nusselt numbers for medium crossflow

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Fig. 13

Local Nusselt number distribution (minimum crossflow, Re = 35,000)

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Fig. 14

Spanwise-averaged Nusselt number (minimum crossflow, Re = 35,000)

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Fig. 15

Area-averaged Nusselt numbers for minimum crossflow

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Fig. 16

Comparison with literature data for the maximum crossflow scheme (bars devote uncertainties of individual measurements)

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