Experimental investigation of emissivity of aluminum alloys and application of multispectral radiation thermometry

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

1 Citation (Scopus)

Abstract

Experiments were first conducted to measure the spectral normal emissivity values of a variety of aluminum alloys at 600, 700, and 800 K. Multispectral radiation thermometry (MRT) using linear emissivity models (LEM) and log-linear emissivity models (LLE) were then applied to predict surface temperature. Results show that the spectral emissivity decreases with increasing wavelength and increases with increasing temperature. Alloy effect becomes evident at higher temperature. The surface oxidation becomes fully-developed after the first hour heating and results in constant emissivity. Half of temperature predictions by MRT emissivity models provide the absolute temperature error under 10% and a quarter if the results are under 5%. The better emissivity model to suitably represent the real surface emissivity behaviors the more accurate inferred temperature by MRT can be achieved. Increasing the order of emissivity model and increasing the number of wavelengths cannot improve temperature measurement accuracy. More accurate temperature measurement by MRT can be achieved at higher temperature. Overall, three emissivity models give good results most frequently and provide the best compensation for different alloys, the number of wavelengths, and temperatures.

Original languageEnglish
Title of host publication2010 14th International Heat Transfer Conference, IHTC 14
Pages867-875
Number of pages9
DOIs
Publication statusPublished - 2010 Dec 1
Event2010 14th International Heat Transfer Conference, IHTC 14 - Washington, DC, United States
Duration: 2010 Aug 82010 Aug 13

Publication series

Name2010 14th International Heat Transfer Conference, IHTC 14
Volume5

Other

Other2010 14th International Heat Transfer Conference, IHTC 14
CountryUnited States
CityWashington, DC
Period10-08-0810-08-13

All Science Journal Classification (ASJC) codes

  • Fluid Flow and Transfer Processes

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