<div class="csl-bib-body">
<div class="csl-entry">Giurgiu, V., Caridi, G. C. A., Alipour, M., De Paoli, M., & Soldati, A. (2023). Messung der Winkelgeschwindigkeit von schlanken, gekrümmten Fasern der Kolmogorov Größe. In C. Kähler (Ed.), <i>Experimentelle Strömungsmechanik: 30. Fachtagung</i>. eutsche Gesellschaft für Laser-Anemometrie - German Association for Laser Anemometry GALA e.V. http://hdl.handle.net/20.500.12708/193698</div>
</div>
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dc.identifier.uri
http://hdl.handle.net/20.500.12708/193698
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dc.description.abstract
We measure the complete angular velocity of slender micro-plastic curved fibres in wall- bounded turbulence. The experiments are done in the TU Wien Turbulent Water Channel at shear Reynolds number 720. Fibre aspect ratio is 120 and their length is 8 Kolmogorov lengths. They are non-deformable, torsion-less, nearly neutrally buoyant, and have negligible inertia in these flow conditions. This study is original because previous experiments are limited to meas- uring rotation rates of large straight rods in homogeneous isotropic turbulence or restricted to tumbling rates only in turbulent channel flow. A 3D time-resolved particle image velocimetry system image the fibres in a close wall region. An established technique of fibre reconstruction and tracking is employed (Alipour et. al 2021) and extended. It consists of four steps: (i) the three-dimensional shape of each fibre is reconstructed with a tomographic algorithm, (ii) track- ing, (iii) modelling of each fibre as a 2nd order polynomial, and (iv) determination of translation and rotation. The unique orientation over time is inferred and used to compute spinning and tumbling rates. We validate our in-house fibre code by generating synthetic fibres with known motion and perform a parameter sensitivity analysis. The uncertainty of the measured spinning rate is found to depend on the length of the minor axis of the curved fibre and its rotational rate. Finally, the ratio of mean spinning to tumbling rate was found higher than unity.
en
dc.description.sponsorship
FWF - Österr. Wissenschaftsfonds
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dc.language.iso
de
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dc.subject
Turbulence
en
dc.subject
Fibres
en
dc.subject
Microplastics
en
dc.title
Messung der Winkelgeschwindigkeit von schlanken, gekrümmten Fasern der Kolmogorov Größe
de
dc.title.alternative
Angular velocity measurement of Kolmogorov scale slender curved fibres
en
dc.type
Inproceedings
en
dc.type
Konferenzbeitrag
de
dc.contributor.affiliation
Yale University, United States of America (the)
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dc.contributor.editoraffiliation
Universität der Bundeswehr München, Germany
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dc.relation.isbn
978-3-9816764-9-5
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dc.relation.grantno
P 35505-N
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dc.type.category
Full-Paper Contribution
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tuw.booktitle
Experimentelle Strömungsmechanik: 30. Fachtagung
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tuw.relation.publisher
eutsche Gesellschaft für Laser-Anemometrie - German Association for Laser Anemometry GALA e.V.
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tuw.relation.publisherplace
Karlsruhe
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tuw.book.chapter
43
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tuw.project.title
Mikrofasern in turbulenter Strömung im offenen Kanal
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tuw.researchTopic.id
E4
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tuw.researchTopic.name
Environmental Monitoring and Climate Adaptation
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tuw.researchTopic.value
100
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tuw.publication.orgunit
E322 - Institut für Strömungsmechanik und Wärmeübertragung
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tuw.publication.orgunit
E322-01 - Forschungsbereich Strömungsmechanik
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dc.description.numberOfPages
8
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tuw.author.orcid
0000-0002-4709-4185
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tuw.editor.orcid
0000-0001-9336-2091
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tuw.event.name
30. Fachtagung Experimentelle Strömungsmechanik
en
dc.description.sponsorshipexternal
FSE S3 HEaD
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dc.description.sponsorshipexternal
PRIN
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dc.relation.grantnoexternal
1619942002
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dc.relation.grantnoexternal
2017RSH3JY
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tuw.event.startdate
05-09-2023
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tuw.event.enddate
07-09-2023
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tuw.event.online
On Site
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tuw.event.type
Event for scientific audience
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tuw.event.place
München
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tuw.event.country
DE
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tuw.event.institution
Deutschen Gesellschaft für Laser-Anemometrie GALA e.V.
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tuw.event.presenter
Giurgiu, Vlad
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wb.sciencebranch
Maschinenbau
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wb.sciencebranch
Physik, Astronomie
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wb.sciencebranch
Mathematik
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wb.sciencebranch.oefos
2030
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wb.sciencebranch.oefos
1030
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wb.sciencebranch.oefos
1010
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wb.sciencebranch.value
50
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wb.sciencebranch.value
40
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wb.sciencebranch.value
10
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item.cerifentitytype
Publications
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item.grantfulltext
restricted
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item.fulltext
no Fulltext
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item.languageiso639-1
de
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item.openairecristype
http://purl.org/coar/resource_type/c_5794
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item.openairetype
conference paper
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crisitem.author.dept
E322-01 - Forschungsbereich Strömungsmechanik
-
crisitem.author.dept
E322-01 - Forschungsbereich Strömungsmechanik
-
crisitem.author.dept
E322-01 - Forschungsbereich Strömungsmechanik
-
crisitem.author.dept
E322-01 - Forschungsbereich Strömungsmechanik
-
crisitem.author.dept
E322 - Institut für Strömungsmechanik und Wärmeübertragung
-
crisitem.author.orcid
0000-0002-4709-4185
-
crisitem.author.parentorg
E322 - Institut für Strömungsmechanik und Wärmeübertragung
-
crisitem.author.parentorg
E322 - Institut für Strömungsmechanik und Wärmeübertragung
-
crisitem.author.parentorg
E322 - Institut für Strömungsmechanik und Wärmeübertragung
-
crisitem.author.parentorg
E322 - Institut für Strömungsmechanik und Wärmeübertragung
-
crisitem.author.parentorg
E300 - Fakultät für Maschinenwesen und Betriebswissenschaften