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IR Radiative Properties of Solid and Liquid Alumina: Effects of Temperature and Gaseous Environment

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Abstract

An infrared spectrometer (spectral range 2–6 μm), coupled with a 9 μm pyrometer (Christiansen’s wavelength), has been developed to collect time-resolved measurements (32 spectra/s) of the spectral emissivity of alumina droplets (d≈ 3 mm) freely cooling in an aerodynamic levitation system from the liquid-to-solid phases [2800 → 1500 K]. The temperature and nature of the gaseous atmosphere surrounding the droplet (oxidizing/neutral/reducing) are two important parameters affecting the spectral emissivity in the semi-transparent range. Observations are discussed in the framework of the thermal activation and of the chemical interactions of alumina with the environment.

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Authors and Affiliations

  1. CRMHT/CNRS, 1D avenue de la Recherche Scientifique, 45071, Cedex 2, Orléans, France

    V. Sarou-Kanian, J. C. Rifflet & F. Millot

Authors
  1. V. Sarou-Kanian
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  2. J. C. Rifflet
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  3. F. Millot
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Corresponding author

Correspondence to V. Sarou-Kanian.

Additional information

Paper presented at the Seventh International Workshop on Subsecond Thermophysics, October 6–8, 2004, Orléans, France.

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Sarou-Kanian, V., Rifflet, J.C. & Millot, F. IR Radiative Properties of Solid and Liquid Alumina: Effects of Temperature and Gaseous Environment. Int J Thermophys 26, 1263–1275 (2005). https://doi.org/10.1007/s10765-005-6725-5

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  • DOI: https://doi.org/10.1007/s10765-005-6725-5

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