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On the interaction between two fixed spherical particles

Prahl, Lisa LU ; Hoelzer, A; Arlov, Dragana LU ; Revstedt, Johan LU ; Sommerfeld, M and Fuchs, Laszlo LU (2007) In International Journal of Multiphase Flow 33(7). p.707-725
Abstract
The variation of the drag (CD) and lift coefficients (CL) of two fixed solid spherical particles placed at different positions relative each other is studied. Simulations are carried out for particle Reynolds numbers of 50, 100 and 200 and the particle position is defined by the angle between the line connecting the centers of the particles and the free-stream direction (a) and the separation distance (do) between the particles. The flow around the particles is simulated using two different methods; the Lattice Boltzmann Method (LBM), using two different computational codes, and a conventional finite difference approach, where the Volume of Solid Method (VOS) is used to represent the particles. Comparisons with available numerical and... (More)
The variation of the drag (CD) and lift coefficients (CL) of two fixed solid spherical particles placed at different positions relative each other is studied. Simulations are carried out for particle Reynolds numbers of 50, 100 and 200 and the particle position is defined by the angle between the line connecting the centers of the particles and the free-stream direction (a) and the separation distance (do) between the particles. The flow around the particles is simulated using two different methods; the Lattice Boltzmann Method (LBM), using two different computational codes, and a conventional finite difference approach, where the Volume of Solid Method (VOS) is used to represent the particles. Comparisons with available numerical and experimental data show that both methods can be used to accurately resolve the flow field around particles and calculate the forces the particles are subjected to. Independent of the Reynolds number, the largest change in drag, as compared to the single particle case, occurs for particles placed in tandem formation. Compared to a single particle, the drag reduction for the secondary particle in tandem arrangement is as high as 60%, 70% and 80% for Re = 50, 100 and 200, respectively. The development of the recirculation zone is found to have a significant influence on the drag force. Depending on the flow Situation in-between the particles for various particle arrangements, attraction and repulsion forces are detected due to low and high pressure regions, respectively. The results show that the inter-particle forces are not negligible even under very dilute conditions. (c) 2007 Elsevier Ltd. All rights reserved. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
method (LBM), interaction, dual particles, lattice Boltzmann, Volume of Solid (VOS)
in
International Journal of Multiphase Flow
volume
33
issue
7
pages
707 - 725
publisher
Elsevier
external identifiers
  • wos:000248068700002
  • scopus:34249873234
ISSN
0301-9322
DOI
10.1016/j.ijmultiphaseflow.2007.02.001
language
English
LU publication?
yes
id
132f45f9-7e9a-4f47-aa58-ce2b9cd49377 (old id 645712)
date added to LUP
2007-12-20 07:51:54
date last changed
2017-05-21 04:27:43
@article{132f45f9-7e9a-4f47-aa58-ce2b9cd49377,
  abstract     = {The variation of the drag (CD) and lift coefficients (CL) of two fixed solid spherical particles placed at different positions relative each other is studied. Simulations are carried out for particle Reynolds numbers of 50, 100 and 200 and the particle position is defined by the angle between the line connecting the centers of the particles and the free-stream direction (a) and the separation distance (do) between the particles. The flow around the particles is simulated using two different methods; the Lattice Boltzmann Method (LBM), using two different computational codes, and a conventional finite difference approach, where the Volume of Solid Method (VOS) is used to represent the particles. Comparisons with available numerical and experimental data show that both methods can be used to accurately resolve the flow field around particles and calculate the forces the particles are subjected to. Independent of the Reynolds number, the largest change in drag, as compared to the single particle case, occurs for particles placed in tandem formation. Compared to a single particle, the drag reduction for the secondary particle in tandem arrangement is as high as 60%, 70% and 80% for Re = 50, 100 and 200, respectively. The development of the recirculation zone is found to have a significant influence on the drag force. Depending on the flow Situation in-between the particles for various particle arrangements, attraction and repulsion forces are detected due to low and high pressure regions, respectively. The results show that the inter-particle forces are not negligible even under very dilute conditions. (c) 2007 Elsevier Ltd. All rights reserved.},
  author       = {Prahl, Lisa and Hoelzer, A and Arlov, Dragana and Revstedt, Johan and Sommerfeld, M and Fuchs, Laszlo},
  issn         = {0301-9322},
  keyword      = {method (LBM),interaction,dual particles,lattice Boltzmann,Volume of Solid (VOS)},
  language     = {eng},
  number       = {7},
  pages        = {707--725},
  publisher    = {Elsevier},
  series       = {International Journal of Multiphase Flow},
  title        = {On the interaction between two fixed spherical particles},
  url          = {http://dx.doi.org/10.1016/j.ijmultiphaseflow.2007.02.001},
  volume       = {33},
  year         = {2007},
}