A new hue capturing technique for the quantitative interpretation of liquid crystal images used in convective heat transfer studies

Cengiz Camci, Kuisoon Kim, S. A. Hippensteele

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Scopus citations

Abstract

This study focuses on a new image processing based color capturing technique for the quantitative interpretation of liquid crystal images used in convective heat transfer studies. The present method is highly applicable to the surfaces exposed to convective heating in gas turbine engines. The study shows that, in single crystal mode, many of the colors appearing on the heat transfer surface strongly correlate with the local temperature. A very accurate quantitative approach using an experimentally determined linear hue versus temperature relation is possible. The new hue capturing process is discussed in detail, in terms of the strength of the light source illuminating the heat transfer surface, effect of the orientation of the illuminating source with respect to the surface, crystal layer uniformity and the repeatability of the process. The method uses a 24 bit color image processing system operating in hue-saturation-intensity domain which is an alternative to conventional systems using red-green-blue color definition. The present method is more advantageous than the multiple filter method because of its ability to generate many isotherms simultaneously from a single crystal image at a high resolution, in a very time efficient manner. The current approach is valuable in terms of its direct application to both steady state and transient heat transfer techniques currently used for the hot section heat transfer research in air breathing propulsion systems.

Original languageEnglish (US)
Title of host publicationHeat Transfer; Electric Power; Industrial and Cogeneration
PublisherAmerican Society of Mechanical Engineers (ASME)
ISBN (Electronic)9780791879016
Publication statusPublished - Jan 1 1991
EventASME 1991 International Gas Turbine and Aeroengine Congress and Exposition, GT 1991 - Orlando, United States
Duration: Jun 3 1991Jun 6 1991

Publication series

NameProceedings of the ASME Turbo Expo
Volume4

Other

OtherASME 1991 International Gas Turbine and Aeroengine Congress and Exposition, GT 1991
CountryUnited States
CityOrlando
Period6/3/916/6/91

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All Science Journal Classification (ASJC) codes

  • Engineering(all)

Cite this

Camci, C., Kim, K., & Hippensteele, S. A. (1991). A new hue capturing technique for the quantitative interpretation of liquid crystal images used in convective heat transfer studies. In Heat Transfer; Electric Power; Industrial and Cogeneration (Proceedings of the ASME Turbo Expo; Vol. 4). American Society of Mechanical Engineers (ASME).