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

研究成果: Conference contribution

3 引文 斯高帕斯(Scopus)

摘要

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.

原文English
主出版物標題2010 14th International Heat Transfer Conference, IHTC 14
頁面867-875
頁數9
DOIs
出版狀態Published - 2010 12月 1
事件2010 14th International Heat Transfer Conference, IHTC 14 - Washington, DC, United States
持續時間: 2010 8月 82010 8月 13

出版系列

名字2010 14th International Heat Transfer Conference, IHTC 14
5

Other

Other2010 14th International Heat Transfer Conference, IHTC 14
國家/地區United States
城市Washington, DC
期間10-08-0810-08-13

All Science Journal Classification (ASJC) codes

  • 流體流動和轉移過程

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