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Heat Transfer on Rotating Channel With Various Heights of Pin-Fin

[+] Author Affiliations
Jun Su Park, Kyung Min Kim, Dong Hyun Lee, Hyung Hee Cho

Yonsei University, Seoul, South Korea

Minking K. Chyu

University of Pittsburgh, Pittsburgh, PA

Paper No. GT2008-50783, pp. 727-734; 8 pages
doi:10.1115/GT2008-50783
From:
  • ASME Turbo Expo 2008: Power for Land, Sea, and Air
  • Volume 4: Heat Transfer, Parts A and B
  • Berlin, Germany, June 9–13, 2008
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 978-0-7918-4314-7 | eISBN: 0-7918-3824-2
  • Copyright © 2008 by ASME

abstract

Pin-fins have been used to enhance the heat transfer near the trailing edge of a turbine airfoil. Previous pin-fin heat transfer studies focused mainly on the array geometry of pin height-to-diameter equal to unity in a stationary frame. This study experimentally examines the effects of pin height-to-diameter ratio (Hp /Dp ) from 2 to 4 and rotation number (Ro ) from 0 to 0.2. The tested model used a staggered pin-fin array with an inter-pin spacing of 2.5 times the pin-diameter (S/D = 2.5) in both longitudinal and transverse directions. Detailed heat/mass transfer coefficients were measured using the naphthalene sublimation technique with a heat-mass transfer analogy. The data measured suggest that an increase in Hp /Dp increases the level of array heat/mass transfer. Array averaged Sherwood numbers for Hp /Dp = 3 and Hp /Dp = 4 are approximately 10% and 35% higher than that of Hp /Dp = 2. The effect of rotation induces notable difference in heat/mass transfer between the leading surface and the trailing surface. The heat transfer coefficients change a little although the rotating number increases in the tested range because the pin-fins break the rotation-induced vortices.

Copyright © 2008 by ASME

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