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Numerical Validation of Heat Transfer Augmentation Factor in Serpentine Passages With Ribbed Walls

[+] Author Affiliations
B. V. N. Ramakumar, Vighneswara R. Kollati, Shraman Goswami, Vaman Kulkarni

Honeywell Technology Solutions, Bangalore, India

Jong S. Liu, Daniel C. Crites

Honeywell Aerospace, Phoenix, AZ

Paper No. GT2010-22636, pp. 233-243; 11 pages
doi:10.1115/GT2010-22636
From:
  • ASME Turbo Expo 2010: Power for Land, Sea, and Air
  • Volume 4: Heat Transfer, Parts A and B
  • Glasgow, UK, June 14–18, 2010
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 978-0-7918-4399-4 | eISBN: 978-0-7918-3872-3
  • Copyright © 2010 by ASME

abstract

The objectives of this study are to validate and calibrate a commercially available CFD code, ANSYS CFX, for aerodynamic and heat transfer predictions in serpentine passages with ribbed walls and to understand the relationship between complex flow fields and heat transfer behavior. The validation was accomplished with the test results of Al-Hadhrami and Han [1] who tested a two-pass, radially outward – 180° bend – radially inward, square serpentine passage with two opposite rib roughened walls. Two configurations of ribs, two Reynolds numbers, two rotational numbers, and two channel orientations were considered for this study. An augmentation factor was used to compare the CFD heat transfer predictions with the experimental results. This augmentation factor is defined as the ratio of the local Nusselt number to that of a fully developed, smooth, circular pipe flow at the same Reynolds number. For the cases studied the CFD predictions were found to match the experimental results within the experimental uncertainty band of 20% except on the leading side of the highest rotational number case where the CFD under predicted the heat transfer augmentation. Streamlines and flow field results obtained at different locations are presented for better understanding of the heat transfer behavior.

Copyright © 2010 by ASME
Topics: Heat transfer

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