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TECHNICAL PAPERS

Experimental Investigation of Local Heat Transfer Distribution on Smooth and Roughened Surfaces Under an Array of Angled Impinging Jets

[+] Author and Article Information
Lamyaa A. El-Gabry

General Electric Company, Global Research Center, Niskayuna, NY 12309elgabry@research.ge.com

Deborah A. Kaminski

Department of Mechanical, Aerospace, and Nuclear Engineering, Rensselaer Polytechnic Institute, Troy, NY 12180-3590kamind@rpi.edu

The lengths of 15 and $2.5mm$ in the $Ra$ and $Rz$ definitions are specific to the profilometer settings.

J. Turbomach 127(3), 532-544 (Aug 31, 2004) (13 pages) doi:10.1115/1.1861918 History: Received December 12, 2003; Revised August 31, 2004

Abstract

Measurements of the local heat transfer distribution on smooth and roughened surfaces under an array of angled impinging jets are presented. The test rig is designed to simulate impingement with crossflow in one direction. Jet angle is varied between 30, 60, and $90deg$ as measured from the target surface, which is either smooth or randomly roughened. Liquid crystal video thermography is used to capture surface temperature data at five different jet Reynolds numbers ranging between 15,000 and 35,000. The effect of jet angle, Reynolds number, gap, and surface roughness on heat transfer and pressure loss is determined along with the various interactions among these parameters.

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Figures

Figure 1

Jet configuration and plate geometry

Figure 2

Test coupon for smooth surface impingement test

Figure 3

Test coupon for smooth surface impingement test (13.28×; average bump diameter ∼0.25mm)

Figure 4

Test rig in pressurized enclosure

Figure 5

Contour plots of Nusselt number distribution for various jet plate configurations

Figure 6

Nusselt number results for 30deg jets impinging on rough surface at gap height Z∕D of 2

Figure 7

Nusselt number results for 30deg jets impinging on smooth surface at gap height Z∕D of 2

Figure 8

Nusselt number results for 30deg jets impinging on smooth surface at gap height Z∕D of 1

Figure 9

Nusselt number results for 60deg jets impinging on rough surface at gap height Z∕D of 2

Figure 10

Nusselt number results for 60deg jets impinging on smooth surface at gap height Z∕D of 2

Figure 11

Nusselt number results for 60deg jets impinging on smooth surface at gap height Z∕D of 1

Figure 12

Nusselt number results for 90deg jets impinging on rough surface at gap height Z∕D of 2

Figure 13

Nusselt number results for 90deg jets impinging on smooth surface at gap height Z∕D of 2

Figure 14

Nusselt number results for 90deg jets impinging on smooth surface at gap height Z∕D of 1

Figure 15

Effect of gap height Z∕D on average Nusselt number

Figure 16

Effect of roughness on average Nusselt number at Z∕D=2

Figure 17

Comparison of average Nusselt number for 90deg jets with published results

Figure 18

Comparison of spanwise average Nusselt number for 90deg jets

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