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Annals of the Assembly for International Heat Transfer Conference 13

ISBN 1-56700-225-0 / CD 1-56700-226-9

Volumes per year:

various

Year 2006

DOI: 10.1615/IHTC13.p4

EXPERIMENTAL AND THEORETICAL DETERMINATION OF SPECTRAL HEAT FLUX EMITTED BY A CERAMIC UNDER AXIAL TEMPERATURE GRADIENT

L. Robin
CEA CESTA, Le Barp, France

A. Delmas
Le Centre de Thermique de Lyon - CETHIL, Villeurbanne Cedex, France

T. Lanternier
CEA CESTA, Le Barp, France

F. Oelhoffen
CEA CESTA, Le Barp, France

V. Ducamp
CEA CESTA, Le Barp, France

ABSTRACT

In order to determine high temperature optical properties of ceramics elaborated by sintering or plasma spraying processes, a new experimental facility has been developed and is described here. The designed apparatus allows measurements of spectral normal radiative heat flux, emitted by ceramic samples, submitted to high heat flux. The main specificity of this device consists in heating samples on one side only, to generate an internal temperature gradient, whose influence on radiative emission is studied. Spectra measured with a Fourier Transform Infrared Spectrometer, may be obtained over a wide range of temperature [1000 − 2500 K] and wavelength [2.5 − 15 μm], at transient or steady states. Temperature on each side of samples is determined by pyrometric measurements at Christiansen wavelength and controlled with an infrared camera. In this preliminary step, measurements are performed at steady state on zirconia sintered samples of well characterised microstructure. Emission data from experiments are compared to predicted spectra obtained from a classical numerical code that treats coupled conduction-radiation heat transfers in semi-transparent media. Radiative properties for these reference samples are obtained through Mie theory.