h1

TY  - THES
AU  - Koch, Matthias
TI  - Effiziente Modellierung der Partikel-Strahlungsinteraktion von nicht-sphärischen Partikelgruppen
PB  - Rheinisch-Westfälische Technische Hochschule Aachen
VL  - Dissertation
CY  - Aachen
M1  - RWTH-2025-07384
SP  - 1 Online-Ressource : Illustrationen
PY  - 2025
N1  - Veröffentlicht auf dem Publikationsserver der RWTH Aachen University
N1  - Dissertation, Rheinisch-Westfälische Technische Hochschule Aachen, 2025
AB  - In this thesis, the interaction of electromagnetic waves with particles is investigated numerically and experimentally. First, single particles are considered and the developed single particle model is finally used to model the radiation interaction with particle groups. In addition to accuracy, the focus is on the computational efficiency of the model, as the finished model will be used for coupled CFD/radiation simulations of large-scale combustors. In addition to the composition, the external shape is particularly important for the radiation behavior of individual particles. Based on Mie theory, which represents an analytical solution of the radiation interaction with homogeneous spheres, the single particle model is extended for prolate ellipsoids. In addition to the complex index of refraction of the material, the wavelength of the incoming electromagnetic wave and the diameter of the projected area, the axis ratio and the orientation of the particles are used as additional input parameters. For the derivation and validation, the discrete-dipole-approximation is used. For direct application, it requires too much memory and is too slow. The radiation exchange of particle groups is then investigated applying the developed single particle model. For later application, it is inefficient to represent each individual particle. Instead, a black box model is developed that calculates the absorption and scattering behavior of the group based on particle size and particle orientation distribution.
LB  - PUB:(DE-HGF)11
DO  - DOI:10.18154/RWTH-2025-07384
UR  - https://publications.rwth-aachen.de/record/1017527
ER  -