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
Numerical study of hot and cold spheroidal particles in a viscous fluid
KTH, Centres, SeRC - Swedish e-Science Research Centre. KTH, School of Engineering Sciences (SCI), Engineering Mechanics.ORCID iD: 0000-0003-4328-7921
Show others and affiliations
2020 (English)In: International Journal of Heat and Mass Transfer, ISSN 0017-9310, E-ISSN 1879-2189, Vol. 149, article id 119206Article in journal (Refereed) Published
Abstract [en]

The gravity-driven motion of rigid particles with a temperature difference with respect to the surrounding viscous fluid is relevant in many natural and industrial processes, yet this has mainly been investigated for spherical particles. In this work we study the influence of the Grashof number (Gr) on the settling velocity and the drag coefficient CD of a single spheroidal particle of different aspect ratios (1/3, 1 and 3). The discrete forcing immersed boundary method (IBM) is employed to represent the fluid-solid interaction in both momentum and temperature equations, while the Boussinesq approximation is used for the coupling of momentum and temperature. The simulations show that the drag coefficient of any spheroidal particle below the onset of secondary motion can be predicted by the results of the settling spheres at the desired Grashof number as the main effect of the particle shape at low Galileo number (Ga) and sufficiently small Gr/Ga2 is found to be the change in the frontal area of the particle. Furthermore, we identify the regions of stable sedimentation (vertical path) in the Ga−Gr/Ga2 plane for the 3 particle shapes, investigated in this study. We show that the critical Ga beyond which the particle exhibits the zigzagging motion, is considerably smaller for oblate particles in comparison to prolate ones at low Gr/Ga2. However, both spheroidal shapes indicate a similar behavior as Gr/Ga2 increases beyond 0.5. 

Place, publisher, year, edition, pages
Elsevier Ltd , 2020. Vol. 149, article id 119206
Keywords [en]
Direct simulation, Heat transfer, Non-spherical, Sedimentation, Aspect ratio, Drag, Drag coefficient, Grashof number, Turbulent flow, Viscosity, Viscous flow, Boussinesq approximations, Fluid solid interaction, Immersed boundary methods, Industrial processs, Spheroidal particles, Temperature differences, Spheres
National Category
Fluid Mechanics and Acoustics
Identifiers
URN: urn:nbn:se:kth:diva-272253DOI: 10.1016/j.ijheatmasstransfer.2019.119206Scopus ID: 2-s2.0-85077748676OAI: oai:DiVA.org:kth-272253DiVA, id: diva2:1425703
Note

QC 20200422

Available from: 2020-04-22 Created: 2020-04-22 Last updated: 2020-04-22Bibliographically approved

Open Access in DiVA

No full text in DiVA

Other links

Publisher's full textScopus

Authority records BETA

Niazi Ardekani, Mehdi

Search in DiVA

By author/editor
Niazi Ardekani, MehdiBrandt, Luca
By organisation
SeRC - Swedish e-Science Research CentreEngineering MechanicsMechanics
In the same journal
International Journal of Heat and Mass Transfer
Fluid Mechanics and Acoustics

Search outside of DiVA

GoogleGoogle Scholar

doi
urn-nbn

Altmetric score

doi
urn-nbn
Total: 3 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