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SPECTRAL RADIATIVE PROPERTIES OF THREE-DIMENSIONALLY ORDERED MACROPOROUS CERIA PARTICLES

DOI: 10.1615/ICHMT.2013.IntSympRadTransf.120
pages 143-157

Vincent Wheeler
Department of Mechanical Engineering, University of Minnesota Church Street 111 S.E., Minneapolis, MN 55455, USA

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

Kumar K. Tamma
Department of Mechanical Engineering, University of Minnesota Church Street 111 S.E., Minneapolis, MN 55455, USA

Wojciech Lipinski
Research School of Engineering, The Australian National University, Canberra ACT 2601, Australia

Abstract

Radiative properties of spherical heterogeneous particles consisting of threedimensionally ordered macroporous (3DOM) cerium dioxide (ceria) are numerically predicted in the spectral range 0.3−10 μm. The particles are 1 μm in diameter, with interconnected pores of diameter 330 nm and a face-centered cubic lattice arrangement. Predictions are obtained by solving macroscopic Maxwell's equations using the discrete dipole approximation and the finite method as a complementary means of numerical prediction. The scattering and absorption efficiency factors as well as the asymmetry factor are determined as a function of the particle orientation relative to the direction of the incident plane wave. The scattering and absorption efficiency factors show significant dependence on the particle orientation in the spectral range equal to particle diameter to 560 nm. Compared to homogeneous ceria particles, 3DOM particles of identical size tend to cancel the wave extinction for wavelength greater than 560 nm. Approximating the 3DOM particles as a homogeneous sphere with properties calculated from an effective medium theory is also considered. This approach is shown to be valid only for wavelengths much greater than the pore size, demonstrating that a detailed geometrical representation of the internal particle structure is essential to obtain accurate radiative characteristics of nano-structured particles.

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