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Absorption and scattering of thermal radiation by a cloud of small particles
Author(s) -
Nagy A. R.,
Lenoir J. M.
Publication year - 1970
Publication title -
aiche journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.958
H-Index - 167
eISSN - 1547-5905
pISSN - 0001-1541
DOI - 10.1002/aic.690160223
Subject(s) - scattering , collimated light , absorption (acoustics) , attenuation coefficient , refractive index , mie scattering , wavelength , optics , radiation , radiative transfer , thermal radiation , forward scatter , materials science , chemistry , light scattering , physics , laser , thermodynamics
An experimental investigation was made of the absorption and scattering of thermal radiation by a cloud of small, spherical, micronsized, aluminum oxide particles in a plane‐parallel enclosure. By using carbon tetrachloride and carbon disulphide as suspendign media, transmission measurements were made with collimated and diffuse sources for wavelengths from 2 to 11μ. By employing a two‐flux diffuse model, the data were correlated to obtain absorption and back‐scattering cross sections. From the diffuse and collimated data, a backscattering coefficient was found which varied linearly with relative refractive index. With the developed coefficients, the absorptivities of the cloud of particles were determined.