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ISSN: 1091-028X Print
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DOI: 10.1615/JPorMedia.v10.i2
Pages: 116
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DOI: 10.1615/JPorMedia.v10.i2.60
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Article price - $35.00 |
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Effective Emissivity Measurements of Powders and Their Mixtures
Fethi Albouchi
Laboratoire d'Etudes des Systèmes Thermiques et Energétiques, Ecole Nationaled 'Ingénieurs de Monastir, Tunisia
Foued MZALI
Laboratoire d'Etudes des Systèmes Thermiques et Energétiques, Ecole Nationaled'Ingénieurs de Monastir, Tunisia
Fabrice Rigollet
Institut Universitaire des Systèmes Thermiques Industriels, UMR CNRS 6595, Ecole Polytechnique Universitaire de Marseille (Dpt. Mécanique Energétique), Technopole de Château Gombert, 5 rue Enrico Fermi, 13453 Marseille cedex 13, France
Sassi Ben Nasrallah
Laboratoire d'Études des Systèmes Thermiques et Énergétiques, École Nationale d'Ingénieurs de Monastir, Monastir 5019 Tunisia
ABSTRACT
In this paper, an experimental measurement technique of the effective emissivity of powders is presented for a given spectral field, using the reflectance hemisphere method. This technique consists of heating a powder filled into a Teflon® cell, through a thin copper layer. The apparent temperature of the powder surface is then measured by an infrared camera, either directly or through an orifice arranged into the hemisphere. The effective emissivity is identified by comparing the flux emitted by the powder surface and that emitted by a specular hemisphere taken as a reference blackbody, for the same temperature and the same spectral wavelength field Δλ. The results are presented for a metallic and an insulating powder, and validated with literature values. The effective emissivities of powder mixtures are also presented in this paper.
pages 189-200
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