A Novel Transient Liquid Crystal Technique to Determine Heat Transfer Coefficient Distributions and Adiabatic Wall Temperature in a Three-Temperature Problem

[+] Author and Article Information
Andrew C. Chambers, David R. H. Gillespie, Peter T. Ireland

Department of Engineering Science, University of Oxford, Oxford, OX1 3PJ, UK

Geoffrey M. Dailey

Rolls-Royce CAEL, Derby, UK

J. Turbomach 125(3), 538-546 (Aug 27, 2003) (9 pages) doi:10.1115/1.1575252 History: Received February 18, 2002; Online August 27, 2003
Copyright © 2003 by ASME
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Typical cross section of a turbine blade cooled by impingement channel
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Impingement channel geometry
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Snapshot of a type A effectiveness test with only the impinging flow heated. Note the areas of no liquid crystal color play where cross flow is predominate.
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Schematic of electrical system
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Variation of liquid crystal transition times for the case of 1) fixed heat transfer coefficient with varying driving gas temperature, and 2) fixed driving gas temperature with varying heat transfer coefficient, respectively
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Normalized heat transfer coefficient and effectiveness on the impingement target surface, Rejet avg=20,000 and 5% initial cross flow
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Normalized heat transfer coefficient and effectiveness on the integrally cast impingement holed surface, Rejet avg=20,000 and 5% initial cross flow
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Mask showing combination of tests used to calculate the heat transfer coefficient and effectiveness in different regions of the model




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