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TECHNICAL PAPERS

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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References

Ireland,  P. T., Neely,  A. J., Gillespie,  D. R. H., and Robertson,  A. J., 1999, “Turbulent Heat Transfer Measurements Using Liquid Crystals,” Int. J. Heat Fluid Flow, 20, pp. 355–367.
Gillespie, D. R. H., 1996, “Intricate Internal Cooling Systems for Gas Turbine Blading,” D. Phil thesis, Oxford University Department of Engineering Science.
den Ouden, C., and Hoogendoorn, C. J., 1974, “Local Convective Heat Transfer Coefficients for Jets Impinging on a Plate: Experiments Using a Liquid Crystal Technique,” Proc. 5th Heat Transfer Conference, Vol. 5, New York, pp. 293–295.
Lucas, M. G., Ireland, P. T., Wang, Z., and Jones, T. V., 1993, “Fundamental Studies of Impingement Cooling Thermal Boundary Conditions,” AGARD CP-527, Paper No. 14.
Sargison, J., E., Guo, S. M., Oldfield, M., L., G., Lock, G., D., and Rawlinson, A., J., 2001, “A Converging Slot-Hole Film-Cooling Geometry Part 1: Low-Speed Flat-Plate Heat Transfer and Loss,” ASME Paper 2001-GT-0126.
Ireland, P. T., and Jones, T. V., 1986, “Detailed Measurements of Heat Transfer on and Around a Pedestal in Fully-Developed Channel Flow,” Proc., 8th Int. Heat Trans. Conf., San Francisco, pp. 975–986.
Chyu, M. K., Ding, H., Downs, J. P., van Sutendael, A., and Soechting, F. S., 1997, “Determination of Local Heat Transfer Coefficient Based on Bulk Mean Temperature Using a Transient Liquid Crystals Technique,” ASME Paper 97-GT-489.
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Gillespie, D. R. H., Ireland, P. T., and Dailey, G. M., 2000, “Detailed Flow and Heat Transfer Coefficient Measurements in a Model of an Internal Cooling Geometry Employing Orthogonal Intersecting Channels,” ASME 2000-GT-653.
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Turnbull, and Oosthuizen (1999), “Theoretical Evaluation of New Phase Delay Methods for Measuring Local Heat Transfer Coefficients,” Trans Canadian Society Mechanical Engineering, Vol. 23, Issues 3–4, pp. 361–376.
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Figures

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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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