kth.sePublications
Change search
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
Turbulent bubbly channel flows: Effects of soluble surfactant and viscoelasticity
KTH, School of Engineering Sciences (SCI), Centres, Linné Flow Center, FLOW.ORCID iD: 0000-0003-4791-3803
KTH, School of Engineering Sciences (SCI), Centres, Linné Flow Center, FLOW.ORCID iD: 0000-0001-7010-1040
Show others and affiliations
2020 (English)In: Computers & Fluids, ISSN 0045-7930, E-ISSN 1879-0747, Vol. 212, article id 104717Article in journal (Refereed) Published
Abstract [en]

Interface-resolved direct numerical simulations are performed to examine the combined effects of soluble surfactant and viscoelasticity on the structure of a bubbly turbulent channel flow. The incompressible flow equations are solved fully coupled with the FENE-P viscoelastic model and the equations governing interfacial and bulk surfactant concentrations. The latter coupling is achieved through a non-linear equation of state which relates the surface tension to the surfactant concentration at the interface. The two-fluid Navier-Stokes equations are solved using a front-tracking method, augmented with a very efficient FFT-based pressure projection method that allows for massively parallel simulations of turbulent flows. It is found that, for the surfactant-free case, bubbles move toward the wall due to inertial lift force, resulting in formation of wall layers and a significant decrease in the flow rate. Conversely, a high-enough concentration of surfactant changes the direction of lateral migration of bubbles, i.e., the contaminated bubbles move toward the core region and spread out across the channel. When viscoelasticity is considered, viscoelastic stresses counteract the Marangoni stresses, promoting formation of bubbly wall-layers and consequently strong decrease in the flow rate. The formation of bubble wall-layers for combined case depends on the interplay of the inertial and elastic, and Marangoni forces. 

Place, publisher, year, edition, pages
Elsevier Ltd , 2020. Vol. 212, article id 104717
Keywords [en]
FENE-P model, Front-tracking method, Soluble surfactant, Turbulent bubbly channel flow, Viscoelasticity, Channel flow, Equations of state, Incompressible flow, Interface states, Surface active agents, Wall flow, Front Tracking method, Lateral migration, Massively parallels, Soluble surfactants, Surfactant concentrations, Turbulent channel flows, Viscoelastic modeling, Viscoelastic stress, Navier Stokes equations
National Category
Fluid Mechanics and Acoustics
Identifiers
URN: urn:nbn:se:kth:diva-282438DOI: 10.1016/j.compfluid.2020.104717ISI: 000573216700005Scopus ID: 2-s2.0-85090837312OAI: oai:DiVA.org:kth-282438DiVA, id: diva2:1471693
Note

QC 20200929

Available from: 2020-09-29 Created: 2020-09-29 Last updated: 2022-06-25Bibliographically approved

Open Access in DiVA

No full text in DiVA

Other links

Publisher's full textScopus

Authority records

Izbassarov, DauletCosta, PedroTammisola, Outi

Search in DiVA

By author/editor
Izbassarov, DauletCosta, PedroTammisola, Outi
By organisation
Linné Flow Center, FLOW
In the same journal
Computers & Fluids
Fluid Mechanics and Acoustics

Search outside of DiVA

GoogleGoogle Scholar

doi
urn-nbn

Altmetric score

doi
urn-nbn
Total: 76 hits
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf