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Systematic Numerical Studies on Heat Transfer and Aerodynamic Characteristics of Impingement Cooling Devices Combined With Pins

[+] Author Affiliations
K. Funazaki, K. Hachiya

Iwate University, Morioka, Japan

Paper No. GT2003-38256, pp. 185-192; 8 pages
doi:10.1115/GT2003-38256
From:
  • ASME Turbo Expo 2003, collocated with the 2003 International Joint Power Generation Conference
  • Volume 5: Turbo Expo 2003, Parts A and B
  • Atlanta, Georgia, USA, June 16–19, 2003
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 0-7918-3688-6 | eISBN: 0-7918-3671-1
  • Copyright © 2003 by ASME

abstract

This paper deals with extensive numerical studies on heat transfer characteristics and fluid dynamics inside several impingement cooling devices combined with pins. As a numerical analysis tool, a commercial software CFX-4.4, AEA Technology, is used. The purpose of this paper is two-fold. First the validity of the numerical tool and grids adopted in this study is checked through the comparison of the numerical results with the experimental counterparts. Turbulence models available in the software are thoroughly tested so as to screen out a turbulence model among them which can reproduce the experimental heat transfer characteristics best. Consequently, k–ω turbulence model is finally adopted as the turbulence model. Parametric studies, where Reynolds number based on impingement hole diameter, pin height-diameter ratio and pin pitch-diameter ratio vary from 5,000 to 25,000, from 0.75 to 4 and from 2 to 4, respectively, are then executed to clarify effects of important dimensions, such as pin height, pin pitch, upon local and averaged heat transfer characteristics as well as pressure loss generated in the devices.

Copyright © 2003 by ASME

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