<div class="csl-bib-body">
<div class="csl-entry">Masoudi, S. (2016). <i>Axisymmetric combined thermocapillary-buoyant flow in sessile and hanging droplets</i> [Dissertation, Technische Universität Wien]. reposiTUm. https://doi.org/10.34726/hss.2016.38986</div>
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dc.identifier.uri
https://doi.org/10.34726/hss.2016.38986
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dc.identifier.uri
http://hdl.handle.net/20.500.12708/7969
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dc.description.abstract
The combined thermocapillary-buoyant flow in sessile and hanging droplets is investigated numerically. The droplet sits on or hangs from a flat plate whose temperature is kept constant. The flow is driven by buoyancy and thermocapillary forces which arise due to a linear variation of the ambient temperature normal to the wall. Neglecting evaporation and in the limit of large mean surface tension the liquid-gas interface is spherical and non-deformable which allows to formulate the problem in body-fitted orthogonal toroidal coordinates such that the interface is a coordinate line. Steady-state axisymmetric solutions to the incompressible Boussinesq equations are obtained using a vorticity-stream function formulation discretized by second-order central finite differences on a non-uniform grid. The resulting nonlinear difference equations are solved iteratively employing a Newton-Raphson method. The results in terms of stream function and temperature are presented varying influential parameters such as the contact angle, Reynolds number, heat transfer rate between the liquid and the ambient, fluid material, and level of gravity. Three different cases are comprehensively examined: thermocapillary-driven flow, buoyancy-driven flow, and mixed thermocapillary-buoyant flow. A temporal two-dimensional linear stability analysis is carried out for the pure buoyant flow as well as for the thermocapillary-driven flow in droplets attached to a flat substrate. The onset of thermal instabilities is found in the buoyancy-driven flow when the temperature is uniformly distributed in vertical direction. Moreover, the existence of axisymmetric instabilities is examined for thermocapillary flow in liquid droplets varying different parameters.
en
dc.language
English
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dc.language.iso
en
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dc.rights.uri
http://rightsstatements.org/vocab/InC/1.0/
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dc.subject
Konvektion
de
dc.subject
Tropfen
de
dc.subject
thermokapillar
de
dc.subject
natürlich
de
dc.subject
Kontaktwinkel
de
dc.subject
Stabilität
de
dc.subject
freie Oberfläche
de
dc.subject
convection
en
dc.subject
droplet
en
dc.subject
thermocapillary
en
dc.subject
natural
en
dc.subject
contact angle
en
dc.subject
stability
en
dc.subject
free surface
en
dc.title
Axisymmetric combined thermocapillary-buoyant flow in sessile and hanging droplets
en
dc.type
Thesis
en
dc.type
Hochschulschrift
de
dc.rights.license
In Copyright
en
dc.rights.license
Urheberrechtsschutz
de
dc.identifier.doi
10.34726/hss.2016.38986
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dc.contributor.affiliation
TU Wien, Österreich
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dc.rights.holder
Saeed Masoudi
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dc.publisher.place
Wien
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tuw.version
vor
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tuw.thesisinformation
Technische Universität Wien
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tuw.publication.orgunit
E322 - Institut für Strömungsmechanik und Wärmeübertragung
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dc.type.qualificationlevel
Doctoral
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dc.identifier.libraryid
AC13370025
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dc.description.numberOfPages
115
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dc.identifier.urn
urn:nbn:at:at-ubtuw:1-8646
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dc.thesistype
Dissertation
de
dc.thesistype
Dissertation
en
dc.rights.identifier
In Copyright
en
dc.rights.identifier
Urheberrechtsschutz
de
tuw.advisor.staffStatus
staff
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tuw.advisor.orcid
0000-0003-1783-3255
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item.languageiso639-1
en
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item.fulltext
with Fulltext
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item.openaccessfulltext
Open Access
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item.mimetype
application/pdf
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item.openairetype
doctoral thesis
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item.grantfulltext
open
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item.openairecristype
http://purl.org/coar/resource_type/c_db06
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item.cerifentitytype
Publications
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crisitem.author.dept
E322 - Institut für Strömungsmechanik und Wärmeübertragung
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crisitem.author.parentorg
E300 - Fakultät für Maschinenwesen und Betriebswissenschaften