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Heat/Mass Transfer Characteristics in Angled Ribbed Channels With Various Bleed Ratios and Rotation Numbers

[+] Author Affiliations
Kyung Min Kim, Suk Hwan Park, Yun Heung Jeon, Dong Hyun Lee, Hyung Hee Cho

Yonsei University, Seoul, South Korea

Paper No. GT2007-27166, pp. 209-218; 10 pages
doi:10.1115/GT2007-27166
From:
  • ASME Turbo Expo 2007: Power for Land, Sea, and Air
  • Volume 4: Turbo Expo 2007, Parts A and B
  • Montreal, Canada, May 14–17, 2007
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 0-7918-4793-4 | eISBN: 0-7918-3796-3
  • Copyright © 2007 by ASME

abstract

The present study investigates the effects of secondary flow due to angled rib turbulators on the heat/mass transfer in the square channels with channel rotation and bleed flow. The angle of attack of the angled ribs was 45°. The bleed holes were located between the rib turbulators on either the leading or trailing surface. The tests were conducted under the conditions corresponding to various bleed ratios (BR = 0.0, 0.2 and 0.4) and rotation numbers (Ro = 0.0, 0.2 and 0.4) at Re = 10,000. The results suggest that the heat/mass transfer characteristics were influenced by the Coriolis force, the decrement of the main flow rate and the secondary flow. In the 90° angled ribbed channel, the heat/mass transfer reduced on the leading surface with an increment in the rotation number, but it increased on the trailing surface. However, it decreased on both surfaces in the 45° angled ribbed channel. As the bleed ratio increased, the Sherwood number ratios decreased on both the bleeding and non-bleeding surfaces for the 45° angled ribs, but increased on the bleeding surface for the 90° angled ribs.

Copyright © 2007 by ASME

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