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dc.contributor.author
Schmidt, Markus Johann
dc.contributor.supervisor
Rösgen, Thomas
dc.contributor.supervisor
Klewicki, Joseph
dc.contributor.supervisor
Koochesfahani, Manoochehr M.
dc.date.accessioned
2021-07-07T09:28:55Z
dc.date.available
2021-03-09T08:50:49Z
dc.date.available
2021-03-15T15:23:49Z
dc.date.available
2021-03-16T08:17:13Z
dc.date.available
2021-03-17T14:04:52Z
dc.date.available
2021-03-18T05:26:16Z
dc.date.available
2021-07-07T09:28:55Z
dc.date.issued
2021
dc.identifier.uri
http://hdl.handle.net/20.500.11850/473539
dc.identifier.doi
10.3929/ethz-b-000473539
dc.description.abstract
Flow-induced rotation, the vorticity, is a fundamental characteristic of turbulent flows. Despite its importance, the direct measurement of vorticity is still limited spatially or temporally depending on the measurement method. This thesis examines luminescence anisotropy as a physical working principle for the direct measurement of vorticity. A theory is developed which relates changes in anisotropy to deterministic rotations. The results are limited to acquisitions of the complete luminescence decay for four polarization signals. The presented model enables the computation of absolute vorticity. Experimental procedures are described to provide a standard for anisotropy measurements in flow diagnostics. Xanthene-stained particles, commonly used in popular methods such as Particle Imaging Velocimetry (PIV), are analyzed concerning their potential use in the proposed method despite their low quantum yield and short luminescent lifetimes. As a reference scenario, a solid body rotation around the axis of observation is captured with fixed particles, and the results are successfully analyzed with the newly developed theoretical framework. Finally, the average absolute vorticity of a round turbulent jet at Re = 12000 and 14400 is measured. The results are compared to the theory in the self-similar region of the jet.
en_US
dc.format
application/pdf
en_US
dc.language.iso
en
en_US
dc.publisher
ETH Zurich
en_US
dc.rights.uri
http://creativecommons.org/licenses/by/4.0/
dc.title
Measurement of Flow-Induced Nanoparticle Rotation with Luminescence Anisotropy
en_US
dc.type
Doctoral Thesis
dc.rights.license
Creative Commons Attribution 4.0 International
dc.date.published
2021-03-16
ethz.size
123 p.
en_US
ethz.code.ddc
DDC - DDC::5 - Science::530 - Physics
en_US
ethz.identifier.diss
27267
en_US
ethz.publication.place
Zurich
en_US
ethz.publication.status
published
en_US
ethz.leitzahl
ETH Zürich::00002 - ETH Zürich::00012 - Lehre und Forschung::00007 - Departemente::02130 - Dep. Maschinenbau und Verfahrenstechnik / Dep. of Mechanical and Process Eng.::02628 - Institut für Fluiddynamik / Institute of Fluid Dynamics::03479 - Rösgen, Thomas / Rösgen, Thomas
en_US
ethz.leitzahl.certified
ETH Zürich::00002 - ETH Zürich::00012 - Lehre und Forschung::00007 - Departemente::02130 - Dep. Maschinenbau und Verfahrenstechnik / Dep. of Mechanical and Process Eng.::02628 - Institut für Fluiddynamik / Institute of Fluid Dynamics::03479 - Rösgen, Thomas / Rösgen, Thomas
en_US
ethz.tag
Fluid Dynamics
en_US
ethz.tag
Fluid Mechanics
en_US
ethz.tag
Flow Diagnostics
en_US
ethz.tag
Vorticity
en_US
ethz.tag
Luminescence Anisotropy
en_US
ethz.tag
Experimental Fluid Dynamics
en_US
ethz.tag
Nanoparticle
en_US
ethz.tag
Fluorescence Anisotropy
en_US
ethz.tag
Phosphorescence Anisotropy
en_US
ethz.tag
Polarization-based Method
en_US
ethz.tag
Flow Visualization
en_US
ethz.tag
Laser Diagnostics
en_US
ethz.relation.isSupplementedBy
10.5281/zenodo.4039555
ethz.relation.isSupplementedBy
10.5281/zenodo.3984818
ethz.relation.isSupplementedBy
10.5281/zenodo.4045665
ethz.relation.isSupplementedBy
10.5281/zenodo.4039456
ethz.relation.isDerivedFrom
10.1017/exp.2021.12
ethz.date.deposited
2021-03-09T08:51:10Z
ethz.source
FORM
ethz.eth
yes
en_US
ethz.availability
Open access
en_US
ethz.rosetta.installDate
2021-03-16T08:17:24Z
ethz.rosetta.lastUpdated
2022-03-29T10:18:35Z
ethz.rosetta.versionExported
true
ethz.COinS
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