<div class="csl-bib-body">
<div class="csl-entry">Roccon, A., Zonta, F., & Soldati, A. (2024). Turbulent drag reduction in water-lubricated channel flow of highly viscous oil. <i>Physical Review Fluids</i>, <i>9</i>(5). https://doi.org/10.1103/PhysRevFluids.9.054611</div>
</div>
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dc.identifier.issn
2469-990X
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dc.identifier.uri
http://hdl.handle.net/20.500.12708/197993
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dc.description.abstract
We study the problem of drag reduction (DR) in a lubricated conduit, in which a thin layer of low-viscosity (e.g., water) fluid is injected in the near-wall region and facilitates the transport of a core of high-viscosity fluid (e.g., oil). In the present investigation, the flow instance is a channel flow, and consequently we have one thin layer of low-viscosity fluid lubricating each wall. We run direct numerical simulations of this flow instance, respecting the protocol of the constant power input approach. This approach prescribes that the flow rate is adjusted according to current pressure gradient, so to keep constant the power in- jected into the flow, it mimics closely real transport pipelines. A phase-field method is used to describe the dynamics of the liquid-liquid interface. As this technique is tailored toward the transport of very viscous fluids like oils, we study the drag reduction performance of the system by keeping fixed the lubricating fluid properties (e.g., water) and by considering two different types of oil characterized by different viscosities, 10 and 100 times more viscous than water, respectively. As in real instances the presence of impurities and surfactants— which act by locally reducing the local value of the surface tension—is inevitable, we consider, for each type of transported oil, a clean and a surfactant-laden interface. For all four tested configurations, we unambiguously show that significant DR can be achieved. Reportedly, compared to the single-phase case, we observe a reduction of the mean pressure gradient down to px/px,sp = 0.25 for the largest viscosity oil. By analyzing the features of turbulence in the lubricating layer, and the close interaction with the perturbations induced by the oil-water interface deformation, we elucidate the physical mechanisms leading to DR and we underline the effects of viscosity ratios and of surfactants.
en
dc.language.iso
en
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dc.publisher
AMER PHYSICAL SOC
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dc.relation.ispartof
Physical Review Fluids
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dc.subject
drag reduction
en
dc.subject
turbulence
en
dc.subject
phase-field
en
dc.title
Turbulent drag reduction in water-lubricated channel flow of highly viscous oil
en
dc.type
Article
en
dc.type
Artikel
de
dc.type.category
Original Research Article
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tuw.container.volume
9
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tuw.container.issue
5
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tuw.journal.peerreviewed
true
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tuw.peerreviewed
true
-
wb.publication.intCoWork
International Co-publication
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tuw.researchTopic.id
C2
-
tuw.researchTopic.id
C6
-
tuw.researchTopic.name
Computational Fluid Dynamics
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tuw.researchTopic.name
Modeling and Simulation
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tuw.researchTopic.value
50
-
tuw.researchTopic.value
50
-
dcterms.isPartOf.title
Physical Review Fluids
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tuw.publication.orgunit
E322 - Institut für Strömungsmechanik und Wärmeübertragung
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tuw.publisher.doi
10.1103/PhysRevFluids.9.054611
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dc.date.onlinefirst
2024
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dc.identifier.eissn
2469-990X
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dc.description.numberOfPages
26
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tuw.author.orcid
0000-0001-7618-7797
-
tuw.author.orcid
0000-0002-3849-315X
-
tuw.author.orcid
0000-0002-7515-7147
-
wb.sci
true
-
wb.sciencebranch
Maschinenbau
-
wb.sciencebranch
Physik, Astronomie
-
wb.sciencebranch
Mathematik
-
wb.sciencebranch.oefos
2030
-
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.fulltext
no Fulltext
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item.openairecristype
http://purl.org/coar/resource_type/c_2df8fbb1
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item.grantfulltext
restricted
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item.openairetype
research article
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item.languageiso639-1
en
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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.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