Simulation of the hydrodynamic drag of aggregated particles

Christian Binder, Christian Feichtinger, Hans Joachim Schmid, Nils Thürey, Wolfgang Peukert, Ulrich Rüde

Research output: Contribution to journalArticlepeer-review

62 Scopus citations

Abstract

The drag force on aggregates and partially sintered agglomerates is assessed using the lattice Boltzmann method (LBM) and accelerated Stokesian dynamics (ASD). Both methods have been compared in terms of accuracy and computational effort. It is shown that they give comparable results if all numerical parameters are controlled carefully. LBM requires a much higher computational effort, however, in contrast to ASD it is able to simulate partially sintered agglomerates as well. The results show that even a very small amount of sintering leads to a significant reduction in the drag force. The analysis of the drag force on agglomerates as well as on aggregates shows that there is no simple geometric quantity which is uniquely related to the drag force. Moreover, there is a significant variation in drag force for single aggregates at different orientations or for the orientation averaged drag force of different aggregates of the same size. This is explained by the structural effects which may lead to a variation in the drag force up to ± 20 %.

Original languageEnglish
Pages (from-to)155-167
Number of pages13
JournalJournal of Colloid and Interface Science
Volume301
Issue number1
DOIs
StatePublished - 1 Sep 2006
Externally publishedYes

Keywords

  • Agglomerates
  • Aggregates
  • Drag force
  • Fractal clusters
  • Lattice Boltzmann method
  • Simulation
  • Stokesian dynamics

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