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@PHDTHESIS{Kampili:1009056,
author = {Kampili, Manohar},
othercontributors = {Allelein, Hans-Josef and Behr, Marek and Reddy, Konireddy
Hemachandra},
title = {{E}uler-{L}agrangian modeling of aerosol transport,
deposition and impact of nuclear decay heat},
school = {Rheinisch-Westfälische Technische Hochschule Aachen},
type = {Dissertation},
address = {Aachen},
publisher = {RWTH Aachen University},
reportid = {RWTH-2025-03307},
pages = {1 Online-Ressource : Illustrationen},
year = {2024},
note = {Veröffentlicht auf dem Publikationsserver der RWTH Aachen
University 2025; Dissertation, Rheinisch-Westfälische
Technische Hochschule Aachen, 2024},
abstract = {During a severe accident, the flow within the nuclear
reactor containment is primarily induced by buoyancy forces
and determines the transport of the steam and
non-condensable gases as well as the distribution and
deposition of the radioactive fission products. In addition
to the noble fission gases, the aerosol-borne fission
products form the major part of the radioactive source term.
Previous work has focused on the potential release of
radioactive materials. However, radioactive decay also acts
as a local heat source in the atmosphere of the containment
or on its structures. In the context of this work, it is
therefore investigated for the first time in detail how the
aerosol-borne decay heat affects the flow and transport
processes in the containment by influencing the local
buoyancy forces and the turbulence. To this end, a detailed
computational fluid dynamics (CFD) model for the
containmentFOAM package is developed. The gas flow is
modeled with the Eulerian approach whereas the aerosol
transport is modeled with the Lagrangian approach, i.e., the
force balance on a particle. Drag, gravity and
thermophoretic forces are considered. To represent turbulent
dispersion, which is crucial for deposition, the Continuous
Random Walk model was implemented and extended to buoyancy
flows. The particle-borne heat of decay is modeled as a heat
source in the fluid. The CFD model is verified in detail and
systematic validation is performed. On basis of the DIANA
experiment (PSI, Switzerland), which has already been used
for validation, the interaction of particle-borne decay heat
with free convection is investigated. It is shown for the
first time that the transported decay power has a visible
influence on the local gas temperature and thus turbulent
free convection. Furthermore, the deposition rate of
submicron particles is visibly affected by thermophoresis
and turbulent dispersion. This detailed insight forms the
basis for the development of an efficient Euler-Euler model
in subsequent work in order to transfer the results to plant
scale.},
cin = {416010},
ddc = {620},
cid = {$I:(DE-82)416010_20140620$},
typ = {PUB:(DE-HGF)11},
doi = {10.18154/RWTH-2025-03307},
url = {https://publications.rwth-aachen.de/record/1009056},
}
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