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

Chang Da Wen, Tzung Yuan Chai

研究成果: Article同行評審

35 引文 斯高帕斯(Scopus)

摘要

Experiments were first conducted to measure the emissivity values of a variety of aluminum alloys at 600, 700, and 800 K. The effects of wavelength, temperature, alloy composition, and heating time on emissivity were investigated. Multispectral radiation thermometry (MRT) with linear emissivity models (LEM) and log-linear emissivity models (LLE) were then applied to predict surface temperature. Parametric influences of wavelength number, heating time and order of emissivity models were examined. Results show that the spectral emissivity decreases with increasing wavelength and increases with increasing temperature. A stronger alloy effect is evident at higher temperature. The spectral emissivity reaches steady state after the first hour heating due to the surface oxidation becoming fully-developed. Half of the temperature predictions by MRT emissivity models provide the absolute temperature error under 10% and quarter of the results are under 5%. Increasing the order of emissivity model and increasing the number of wavelengths cannot improve temperature measurement accuracy. Overall, LLE models show higher accuracy than LEM models. The first-order and second-order LLE models and the first-order LEM model give good results most frequently and provide the best compensation for different alloys, the number of wavelengths, and temperatures.

原文English
頁(從 - 到)2414-2421
頁數8
期刊Applied Thermal Engineering
31
發行號14-15
DOIs
出版狀態Published - 2011 十月

All Science Journal Classification (ASJC) codes

  • 能源工程與電力技術
  • 工業與製造工程

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