Annals of the Assembly for International Heat Transfer Conference 13

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

Year 2006

Leonid A. Dombrovsky
Joint Institute for High Temperatures, Moscow, Russia

J. Randrianalisoa
Centre de Thermique de Lyon, Institut National des Sciences Appliqués, Lyon, France

Dominique Baillis
Centre de Thermique de Lyon (CETHIL), UMR CNRS 5008, Institut National des Sciences Appliquées de Lyon, France

Infrared radiative properties of a polymer containing hollow glass microspheres are studied by means of the measurements of directional-hemispherical reflectance and transmittance in the wavelength range from 2.6 to 18 μm. The measurements of both total and diffuse components of the reflectance and transmittance for the normal incidence of collimated radiation are performed for several samples containing different series of microspheres of volume fraction from about 6% to 66%. The effect of the roughness of the sample surface is also studied in the experiments. Relatively strong peak of reflectance at the wavelength 4.5 μm was observed. This peak is explained in terms of theoretical model based on Mie theory calculations for single microspheres in refracting and absorbing polymer and modified two-flux approximation proposed recently by the authors for radiative transfer in plane-parallel layer of refracting and anisotropically scattering medium. A good qualitative agreement of theoretical predictions with experimental data confirms applicability of independent scattering approach even for the case of high volume fraction of microspheres in the polymer.

RAD-03 pages DOI: 10.1615/IHTC13.p4.30 Download article

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