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Research Papers: Jets, Wakes, and Impingement Cooling

Heat Transfer Characteristics of an Impinging Jet in Crossflow

[+] Author and Article Information
Lei Wang1

 Heat Transfer Division, Lund University, Box 118, Lund SE-22 100, Swedenlei.wang@energy.lth.se

Bengt Sundén

 Heat Transfer Division, Lund University, Box 118, Lund SE-22 100, Swedenlei.wang@energy.lth.se

Andreas Borg, Hans Abrahamsson

 Volvo Aero Corporation, Trollhättan SE-46 181, Sweden

1

Corresponding author.

J. Heat Transfer 133(12), 122202 (Oct 07, 2011) (10 pages) doi:10.1115/1.4004527 History: Received June 22, 2010; Revised June 29, 2011; Published October 07, 2011

The heat transfer characteristics of an impinging jet into a crossflow have been investigated by the liquid crystal thermography technique. The jet nozzle is circular and is inclined at 10 deg with respect to the target wall. In a turbulent flow regime, the effects of the jet Reynolds number, the velocity ratio, and the crossflow Reynolds number on the heat transfer are examined. The results show that the heat transfer patterns are strongly affected by the jet Reynolds number and the velocity ratio. For a given jet Reynolds number, it is found that the crossflow diminishes the peak Nusselt number in the jet impingement region. However, in the wall jet region, the results suggest that the local heat transfer is nearly independent of the crossflow Reynolds number.

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Copyright © 2011 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

Schematic of test section. The length unit is millimeter.

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Figure 2

Jet specifications. The length unit is millimeter.

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Figure 3

A typical LCT image

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Figure 4

Thermal development region in a pure channel flow

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Figure 5

Nusselt number contours for (a) Rej=20,000; (b) Rej=28,000; (c) Rej=40,000 at M=1.4

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Figure 6

Nu profiles along the centerline for M=1.4

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Figure 7

Nu profiles across the stagnation point for M=1.4

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Figure 8

Profiles of enhancement factor for M=1.4

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Figure 9

Nu profiles along the centerline for low velocity ratios

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Figure 10

Nusselt number contours for (a) M=2.0; (b) M=2.8

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Figure 11

Nu profiles along the centerline for high velocity ratios

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Figure 12

Normalized Nu profiles across the stagnation point for high velocity ratios

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Figure 13

Nu profiles along the centerline for Rej=28,000

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Figure 14

Nu¯ profiles for Rej=28,000

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