Publication Abstracts
Mackowski and Mishchenko 2013
Mackowski, D.W., and , 2013: Direct simulation of extinction in a slab of spherical particles. J. Quant. Spectrosc. Radiat. Transfer, 123, 103-112, doi:10.1016/j.jqsrt.2013.02.008.
The exact multiple sphere superposition method is used to calculate the coherent and incoherent contributions to the ensemble-averaged electric field amplitude and Poynting vector in systems of randomly positioned nonabsorbing spherical particles. The target systems consist of cylindrical volumes, with radius several times larger than length, containing spheres with positional configurations generated by a Monte Carlo sampling method. Spatially-dependent values for coherent electric field amplitude, coherent energy flux, and diffuse energy flux, are calculated by averaging of exact local field and flux values over multiple configurations and over spatially-independent directions for fixed target geometry, sphere properties, and sphere volume fraction. Our results reveal exponential attenuation of the coherent field and the coherent energy flux inside the particulate layer and thereby further corroborate the general methodology of the microphysical radiative transfer theory. An effective medium model based on plane wave transmission and reflection by a plane layer is used to model the dependence of the coherent electric field on particle packing density. The effective attenuation coefficient of the random medium, computed from the direct simulations, is found to agree closely with effective medium theories and with measurements. In addition, the simulation results reveal the presence of a counter-propagating component to the coherent field, which arises due to the internal reflection of the main coherent field component by the target boundary. The characteristics of the diffuse flux are compared to, and found to be consistent with, a model based on the diffusion approximation of the radiative transfer theory.
Export citation: [ BibTeX ] [ RIS ]
BibTeX Citation
@article{mi04910o,
author={Mackowski, D. W. and Mishchenko, M. I.},
title={Direct simulation of extinction in a slab of spherical particles},
year={2013},
journal={J. Quant. Spectrosc. Radiat. Transfer},
volume={123},
pages={103--112},
doi={10.1016/j.jqsrt.2013.02.008},
}
[ Close ]
RIS Citation
TY - JOUR ID - mi04910o AU - Mackowski, D. W. AU - Mishchenko, M. I. PY - 2013 TI - Direct simulation of extinction in a slab of spherical particles JA - J. Quant. Spectrosc. Radiat. Transfer VL - 123 SP - 103 EP - 112 DO - 10.1016/j.jqsrt.2013.02.008 ER -
[ Close ]
