Radiative characterisation of small heterogeneous particles

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Fig. 1. Model heterogeneous particle exposed to an external plane electromagnetic wave.

The effects of pore-level geometry on direction-averaged radiative properties of small heterogeneous particles encountered in solar thermochemical applications such as three-dimensionally ordered macro-porous (3DOM) cerium dioxide (ceria) particles are investigated in the UV, VIS and IR spectral ranges, typically 0.3–10 μm. The porous particles are modeled as three-dimensional arrays of interacting dipoles using the discrete dipole approximation (DDA). Reference solutions are obtained by directly solving Maxwell's equations. Validity ranges of the Lorenz–Mie theory to predict far-field radiative properties of quasi-homogeneous particles with the effective optical properties obtained using the volume-averaging theories (VAT) are established. The properties of interest are the spectral extinction, scattering, and absorption efficiency factors as well as the scattering phase function and the scattering asymmetry factor.

References

  1. J. Randrianalisoa and W. Lipiński. Effect of pore-level geometry on far-field radiative properties of three-dimensionally ordered macro-porous ceria particle. Applied Optics, 53:1290–1297, 2014.

    DOI: 10.1364/AO.53.001290

  2. V.M. Wheeler, J. Randrianalisoa, K.K. Tamma, and W. Lipiński. Spectral radiative properties of three-dimensionally ordered macroporous ceria particles. Journal of Quantitative Spectroscopy and Radiative Transfer, 143:63–72, 2014.

    DOI: 10.1016/j.jqsrt.2013.08.007

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