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TECHNICAL PAPERS

A Novel Liquid Crystal Image Processing Technique Using Multiple Gas Temperature Steps to Determine Heat Transfer Coefficient Distribution and Adiabatic Wall Temperature

[+] Author and Article Information
Abd Rahim Abu Talib

Department of Aerospace Engineering, Faculty of Engineering, Universiti Putra Malaysia, Serdang, 43400 Selangor, Malaysiae-mail: abrahim@eng.upm.edu.my

Andrew J. Neely

School of Aerospace and Mechanical Engineering, University of New South Wales, Australian Defense Force Academy, Northcott Drive, Canberra ACT 2600, Australiae-mail: a.neely@adfa.edu.au

Peter T. Ireland

Department of Engineering Science, University of Oxford, Parks Road, Oxford OX1 3PJ, UKe-mail: peter.Ireland@eng.ox.ac.uk

Andrew J. Mullender

Fire Precautions Group, Rolls-Royce plc., P.O. Box 31, Derby DE24 8BJ, UKe-mail: andy.mullender@rolls-royce.com

J. Turbomach 126(4), 587-596 (Dec 29, 2004) (10 pages) doi:10.1115/1.1776585 History: Received December 01, 2002; Revised March 01, 2003; Online December 29, 2004
Copyright © 2004 by ASME
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References

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Figures

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Schematic of calibration rig setup
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Heating phase of the calibration of a mix of three narrow-band liquid crystals
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Cooling phase of the calibration of a mix of three narrow-band liquid crystals
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Schematic of the surface thermocouples arrangements
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Schematic of perspex flat-plate test
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Penetration depth of heat pulse into perspex
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Image processing sequence
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Result from a one gas-temperature step test
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Result from a two gas-temperature steps test
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Result from a one gas-temperature step test
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Result from a two gas-temperature steps test
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Plot of heat flux against temperature
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Plot of h against vertical displacement on the flat plate
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Plot of Tbar against vertical displacement on the flat plate
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RMS error in intensity fit for multiple temperature steps (U=Tg steps up, D=Tg steps down)
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Effect of increasing the number of steps
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Plot of RSS error and maximum error against number of temperature steps

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