On the interaction between two fixed spherical particles
(2007) In International Journal of Multiphase Flow 33(7). p.707725 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 freestream 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 freestream 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 inbetween 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 interparticle forces are not negligible even under very dilute conditions. (c) 2007 Elsevier Ltd. All rights reserved. (Less)
Please use this url to cite or link to this publication:
http://lup.lub.lu.se/record/645712
 author
 Prahl, Lisa ^{LU} ; Hoelzer, A; Arlov, Dragana ^{LU} ; Revstedt, Johan ^{LU} ; Sommerfeld, M and Fuchs, Laszlo ^{LU}
 organization
 publishing date
 2007
 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
 03019322
 DOI
 10.1016/j.ijmultiphaseflow.2007.02.001
 language
 English
 LU publication?
 yes
 id
 132f45f97e9a4f47aa58ce2b9cd49377 (old id 645712)
 date added to LUP
 20071220 07:51:54
 date last changed
 20180107 09:39:39
@article{132f45f97e9a4f47aa58ce2b9cd49377, 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 freestream 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 inbetween 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 interparticle 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 = {03019322}, keyword = {method (LBM),interaction,dual particles,lattice Boltzmann,Volume of Solid (VOS)}, language = {eng}, number = {7}, pages = {707725}, 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}, }