0
Research Papers

Heat Transfer From Low Aspect Ratio Pin Fins

[+] Author and Article Information
Michael E. Lyall, Alan A. Thrift

Mechanical Engineering Department, Virginia Polytechnic Institute and State University, Blacksburg, VA 24060

Karen A. Thole

Mechanical and Nuclear Engineering Department, Pennsylvania State University, State College, PA 16803

Atul Kohli

 Pratt & Whitney, 400 Main Street, M∕S 165-16, East Hartford, CT 06108

J. Turbomach 133(1), 011001 (Sep 07, 2010) (10 pages) doi:10.1115/1.2812951 History: Received June 18, 2007; Revised July 03, 2007; Published September 07, 2010; Online September 07, 2010

The performance of many engineering devices from power electronics to gas turbines is limited by thermal management. Heat transfer augmentation in internal flows is commonly achieved through the use of pin fins, which increase both surface area and turbulence. The present research is focused on internal cooling of turbine airfoils using a single row of circular pin fins that is oriented perpendicular to the flow. Low aspect ratio pin fins were studied whereby the channel height to pin diameter was unity. A number of spanwise spacings were investigated for a Reynolds number range between 5000 and 30,000. Both pressure drop and spatially resolved heat transfer measurements were taken. The heat transfer measurements were made on the endwall of the pin fin array using infrared thermography and on the pin surface using discrete thermocouples. The results show that the heat transfer augmentation relative to open channel flow is the highest for smallest spanwise spacings and lowest Reynolds numbers. The results also indicate that the pin fin heat transfer is higher than the endwall heat transfer.

Copyright © 2011 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 of the overall test facility for the pin fin testing

Grahic Jump Location
Figure 2

Test section for the pin fin array

Grahic Jump Location
Figure 3

Diagram of the balsa wood pin fin construction

Grahic Jump Location
Figure 4

Augmentation contour plots for the S∕d=2 geometry

Grahic Jump Location
Figure 5

Augmentation contour plots for the S∕d=4 geometry

Grahic Jump Location
Figure 6

Augmentation contour plots for the S∕d=8 geometry

Grahic Jump Location
Figure 7

Augmentation values of pitchwise-averaged endwall heat transfer for the S∕d=2 geometry

Grahic Jump Location
Figure 8

Augmentation values of pitchwise-averaged endwall heat transfer for the S∕d=8 geometry

Grahic Jump Location
Figure 9

Pin fin heat transfer coefficients for S∕d=2, 4, and 8 as compared with results from the literature

Grahic Jump Location
Figure 10

Pin to endwall heat transfer ratio as a function of Red

Grahic Jump Location
Figure 11

Combined pin and endwall heat transfer augmentation over fully developed open duct flow for the S∕d=2, 4, and 8 geometries

Grahic Jump Location
Figure 12

Dependency of Nud on pin spacing at a Reynolds number of Red=5000

Grahic Jump Location
Figure 13

Dependency of Nud on pin spacing at a Reynolds number of Red=17,500

Grahic Jump Location
Figure 14

Normalized combined pin and endwall heat transfer versus the spanwise pin spacing

Grahic Jump Location
Figure 15

Spanwise line plots of normalized heat transfer one and five pin diameters downstream of the pin at Re=5000

Grahic Jump Location
Figure 16

Spanwise line plots of normalized heat transfer one and five pin diameters downstream of the pin at Re=30,000

Grahic Jump Location
Figure 17

Friction factor augmentations for the pin fin array over a fully turbulent duct

Grahic Jump Location
Figure 18

Contribution of pin pressure drop relative to the total pressure drop for a fully turbulent duct flow

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