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International Heat Transfer Conference 13

ISSN: 2377-424X (online)
ISSN: 2377-4371 (flashdrive)

INFRARED RADIATIVE PROPERTIES OF POLYMER COATING CONTAINING HOLLOW MICROSPHERES

Leonid A. Dombrovsky
Joint Institute for High Temperatures, 17A Krasnokazarmennaya Str., Moscow, 111116, Russia; Tyumen State University, 6 Volodarsky Str., Tyumen, 625003, Russia

Jaona Harifidy Randrianalisoa
Centre de Thermique de Lyon, Institut National des Sciences Appliqués, Lyon; GRESPI - EA 4694, University of Reims Champagne-Ardenne, F-51687 Reims, France

Dominique Baillis
LaMCoS, INSA-Lyon, CNRS UMR 5259,18-20 Rue des Sciences, F69621 Villeurbanne, France

DOI: 10.1615/IHTC13.p4.30
11 pages

Abstract

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.

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Measurement of fluid temperature with an arrangement of three thermocouples