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2016
ACL
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B.Bouvry, L.del Campo, D.De Sousa Meneses, O.Rozenbaum, R.Echegut, D.Lechevalier, M.Gaubil, P.Echegut, 'Hybrid Methodology for Retrieving Thermal Radiative Properties of Semi-Transparent Ceramics', J. Phys. Chem. C 120 3267-3274 (2016) doi:10.1021/acs.jpcc.5b09693
Semitransparent materials, like silica or alumina, are highly used by hightemperature
industries as refractory materials in blast or glass-making furnaces, first for their
good mechanical properties. The knowledge of their radiative properties is also essential to
improve thermal transfers. However, characterizing experimentally the high temperature
dependence of radiative properties of semitransparent ceramic materials remains nowadays
a difficult task. This paper reports a hybrid methodology to address this problem. The
approach relies on two or more experimental emittance measurements, performed by
infrared spectroscopy on samples of increasing thicknesses, and application of emittance
models. The efficiency of the method is illustrated by using experimental data obtained on
Jargal M samples, an industrial electrofused ceramic, and a virtual media built from X-ray
computed tomography images. Two emittance models, a model from the literature and a
new model proposed in this work, are selected to be a part of the hybrid methodology, since
they allow retrieving complementary information on the optical and scattering properties of
the materials. Both models show a good efficiency to reproduce emittance behavior of the
industrial and virtual samples. Parameters are extracted from these models to improve our knowledge of the characteristic
thickness of radiative transfer into semitransparent materials and the emittance value of semi-infinite media.
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