Paper Title:
Heat Transfer in Narrow Rectangular Channels with Rib Turbulators
  Abstract

An experimental study of heat transfer characteristics of narrow rectangular channels with rib turbulators for Re in the range of 10000-60000 was performed. To simulate the actual geometry and heat transfer structure of blade/vane internal cooling passage, each of the test channels was welded by four stainless steel plates. Because of the three dimensional heat conduction in the walls and heat conduction between the ribbed and smooth walls, the measured temperature distribution along the axial direction of the test channel is a smooth continuous curve, and when the Re is low, the average Nu of the ribbed and smooth walls are nearly the same. For each aspect ratio channels, the average Nu for the channel of α=45° is about 15 to 25 percent higher than that of α=60°. In addition, we have developed the semi-empirical correlations, covering the range of Re, to predict heat transfer coefficient of the channels. The correlations can be used in the design of turbine blade/vane cooling channels.

  Info
Periodical
Advanced Materials Research (Volumes 354-355)
Chapter
Chapter 8: Electrician Theory and New Technology
Edited by
Hao Zhang, Yang Fu and Zhong Tang
Pages
1245-1251
DOI
10.4028/www.scientific.net/AMR.354-355.1245
Citation
J. Z. Liu, J. M. Gao, T. Y. Gao, J. J. Shi, "Heat Transfer in Narrow Rectangular Channels with Rib Turbulators", Advanced Materials Research, Vols. 354-355, pp. 1245-1251, 2012
Online since
October 2011
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Price
$32.00
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