Radiative heat transfer characteristics from the surface of a substance coated with a high-emissivity material have been examined from the measured two-dimensional (2D) temperature distribution using two-color thermometry principle. The technique utilized a charge coupled device camera and optical filters having either wide or narrow wavelength bandpass filters. The results obtained were compared to evaluate the accuracy of the temperature measurements. The 2D emissivity distributions were also derived from the measured 2D temperature distributions. The results indicate that the substrate coated with high-emissivity material exhibit high emission of radiation, resulting in effective cooling. The enhanced emissivity of materials also results in improved radiative heat transfer in heating furnaces and other high-temperature applications. The emissivity measured with the wide-bandpass filters increased with temperature. Atmospheric absorption, mainly due to humidity, made a negligible contribution to the total spectral intensity and to the temperature measurements. The small discrepancies are attributed to the dependence of emissivity on wavelength. Thus, the use of narrow-bandpass filters in thermometry is advantageous over the wide-bandpass ones.
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e-mail: akgupta@eng.umd.edu
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July 2005
Technical Papers
Spectroscopic Measurements of High Emissivity Materials Using Two-Dimensional Two-Color Thermometry
Yuichiro Tago,
Yuichiro Tago
Department of Energy Engineering and Science,
Nagoya University
, Chikusa-ku, Nagoya 464-8603, Japan
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Fumie Akimoto,
Fumie Akimoto
Research Center for Advanced Energy Conversion,
Nagoya University
, Chikusa-ku, Nagoya 464-8603, Japan
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Kuniyuki Kitagawa,
Kuniyuki Kitagawa
Research Center for Advanced Energy Conversion,
Nagoya University
, Chikusa-ku, Nagoya 464-8603, Japan
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Norio Arai,
Norio Arai
Research Center for Advanced Energy Conversion,
Nagoya University
, Chikusa-ku, Nagoya 464-8603, Japan
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Stuart W. Churchill,
Stuart W. Churchill
Department of Chemical Engineering,
University of Pennsylvania
, 311A Towne Building, 220 S. 33rd Street, Philadelphia, PA 19104
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Ashwani K. Gupta
Ashwani K. Gupta
Department of Mechanical Engineering,
e-mail: akgupta@eng.umd.edu
University of Maryland
, College Park, MD 20742
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Yuichiro Tago
Department of Energy Engineering and Science,
Nagoya University
, Chikusa-ku, Nagoya 464-8603, Japan
Fumie Akimoto
Research Center for Advanced Energy Conversion,
Nagoya University
, Chikusa-ku, Nagoya 464-8603, Japan
Kuniyuki Kitagawa
Research Center for Advanced Energy Conversion,
Nagoya University
, Chikusa-ku, Nagoya 464-8603, Japan
Norio Arai
Research Center for Advanced Energy Conversion,
Nagoya University
, Chikusa-ku, Nagoya 464-8603, Japan
Stuart W. Churchill
Department of Chemical Engineering,
University of Pennsylvania
, 311A Towne Building, 220 S. 33rd Street, Philadelphia, PA 19104
Ashwani K. Gupta
Department of Mechanical Engineering,
University of Maryland
, College Park, MD 20742e-mail: akgupta@eng.umd.edu
J. Eng. Gas Turbines Power. Jul 2005, 127(3): 472-477 (6 pages)
Published Online: August 10, 2004
Article history
Received:
December 20, 2002
Revised:
August 10, 2004
Citation
Tago, Y., Akimoto, F., Kitagawa, K., Arai, N., Churchill, S. W., and Gupta, A. K. (August 10, 2004). "Spectroscopic Measurements of High Emissivity Materials Using Two-Dimensional Two-Color Thermometry." ASME. J. Eng. Gas Turbines Power. July 2005; 127(3): 472–477. https://doi.org/10.1115/1.1917889
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