0
RESEARCH PAPERS: Jets, Wakes, and Impingement Cooling

Effects of Fin Shapes and Arrangements on Heat Transfer for Impingement∕Effusion Cooling with Crossflow

[+] Author and Article Information
Sung Kook Hong, Dong-Ho Rhee

Department of Mechanical Engineering, Yonsei University, Seoul 120-749, Korea

Hyung Hee Cho1

Department of Mechanical Engineering, Yonsei University, Seoul 120-749, Koreahhcho@yonsei.ac.kr

1

Corresponding author.

J. Heat Transfer 129(12), 1697-1707 (Apr 19, 2007) (11 pages) doi:10.1115/1.2767727 History: Received November 25, 2006; Revised April 19, 2007

The present paper has investigated the effects of fins on the flow and heat∕mass transfer characteristics for the impingement∕effusion cooling with crossflow. The circular or rectangular fins are installed between two perforated plates, and the crossflow occurs between these two plates. The crossflow blowing ratio is varied from 0.5 to 1.5 for a fixed jet Reynolds number of 10,000. A naphthalene sublimation method is used to obtain local heat∕mass transfer coefficients on the effusion plate. A numerical calculation is also performed to investigate the flow characteristics. The flow and heat∕mass transfer characteristics are changed significantly due to the installation of fins. In the injection hole region, the wall jet spreads more widely than in the case without fins because the fins prevent the wall jet from being swept away by the crossflow. In the effusion hole region, a higher heat∕mass transfer coefficient is obtained due to the flow disturbance and acceleration by the fin. As the blowing ratio increases, the effect of fins against the crossflow becomes more significant and subsequently the higher average heat∕mass transfer coefficients are obtained. In particular, the cases with rectangular fins show an approximately 40–45% enhancement at the high blowing ratio of M=1.5. However, the increase in the blockage effect results in increased pressure loss in the channel.

Copyright © 2007 by American Society of Mechanical Engineers
Your Session has timed out. Please sign back in to continue.

References

Figures

Grahic Jump Location
Figure 1

Schematic view of experimental facility: (a) experimental apparatus and (b) test section

Grahic Jump Location
Figure 2

Schematic view of various fin shapes and arrangements: (a) CP1, (b) CP2, (c) RF0, (d) RF1, and (e) RF2

Grahic Jump Location
Figure 3

Calculation domain and boundary conditions for the impingement∕effusion cooling system

Grahic Jump Location
Figure 4

Contour plots of Sh for crossflow only with various fin shapes: (a) CP fins (CP1) and (b) RFs (RF1)

Grahic Jump Location
Figure 5

Spanwise averaged Sh for crossflow only with various fin shapes

Grahic Jump Location
Figure 6

Contour plots of Sh for array jet cooling with initial crossflow at M=1.0: (a) without fins and (b) RFs (RF1)

Grahic Jump Location
Figure 7

Velocity vector on the injection and the effusion planes at M=1.0: (a) without fins, (b) CP fins (CP1), and (c) RFs (RF1)

Grahic Jump Location
Figure 8

Velocity vector on the bottom of the effusion planes: (a) without fins, (b) CP1, and (c)RF1

Grahic Jump Location
Figure 9

Contour plots of Sh for impingement∕effusion cooling with circular pin fins at M=1.0: (a) without fins (b) CP1, and (c)CP2

Grahic Jump Location
Figure 10

Local distributions of Sh for impingement∕effusion cooling with circular pin fins at M=1.0: (a) z∕d=3.0 and (b) z∕d=0.0

Grahic Jump Location
Figure 11

Contour plots of Sh for impingement∕effusion cooling with RFs at M=1.0: (a) RF0, (b) RF1, and (c)RF2

Grahic Jump Location
Figure 12

Local distributions of Sh for impingement∕effusion cooling with RFs at M=1.0: (a) z∕d=3.0 and (b) z∕d=0.0

Grahic Jump Location
Figure 13

Spanwise averaged Sh for impingement∕effusion cooling with various fin cases at M=1.0: (a) CP fins and (b) RFs

Grahic Jump Location
Figure 14

Contour plots of Sh for impingement∕effusion cooling with RFs (RF1) at different blowing ratios: (a) M=0.5 and (b) M=1.5

Grahic Jump Location
Figure 15

Overall averaged Sh for various fins cases at different blowing ratios

Grahic Jump Location
Figure 16

Pressure drop for the impingement∕effusion cooling at various fins cases

Tables

Errata

Discussions

Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging and repositioning the boxes below.

Related Journal Articles
Related eBook Content
Topic Collections

Sorry! You do not have access to this content. For assistance or to subscribe, please contact us:

  • TELEPHONE: 1-800-843-2763 (Toll-free in the USA)
  • EMAIL: asmedigitalcollection@asme.org
Sign In