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THE МIE THEORY ANALYSIS OF COMPARABLY DENSE DISPERSE SYSTEMS

DOI: 10.1615/ICHMT.1995.RadTransfProc.250

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

Résumé

Some high-density disperse systems of randomly placed particles are considered. Applicability of the Mie theory and the radiation transfer theory for these systems is not obvious due to small distances between particles in comparison with the radiation wavelength. Solutions of the following problems are presented:
− Microwave emissivity of a foam on the water surface both for the emulsive monolayer and the honeycomb structure including the spectral range, in which the wavelength is greater than the foam layer thickness.
− Absorption and scattering of microwave radiation by metal powder in dielectric at the wavelength much greater than distances between particles.
− Infrared radiative properties of the quartz fibrous material with numerous contacts between fibers.
A comparison of calculations with published experimental data is given. It is shown that one can use the classic treatment of the problems considered in terms of the Mie theory and the radiation transfer theory. This conclusion does not hold for observations at small angles to an exposed surface.

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