Capillary Interactions, Aggregate Formation, and the Rheology of Particle-Laden Flows: A Lattice Boltzmann Study

Lei Yang, Marcello Sega, Steffen Leimbach, Sebastian Kolb, Jürgen Karl, Jens Harting (Corresponding author)

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3 Citations (Scopus)
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Abstract

The agglomeration of particles caused by the formation of capillary bridges has a decisive impact on the transport properties of a variety of at a first sight very different systems such as capillary suspensions, fluidized beds in chemical reactors, or even sand castles. Here, we study the connection between the microstructure of the agglomerates and the rheology of fluidized suspensions using a coupled lattice Boltzmann and discrete element method approach. We address the influence of the shear rate, the secondary fluid surface tension, and the suspending liquid viscosity. The presence of capillary interactions promotes the formation of either filaments or globular clusters, leading to an increased suspension viscosity. Unexpectedly, filaments have the opposite effect on the viscosity as compared to globular clusters, decreasing the suspension viscosity at larger capillary interaction strengths. In addition, we show that the suspending fluid viscosity also has a nontrivial influence on the effective viscosity of the suspension, a fact usually not taken into account by empirical models.

Original languageEnglish
Pages (from-to)1863-1870
Number of pages8
JournalIndustrial and Engineering Chemistry Research
Volume61
Issue number4
DOIs
Publication statusPublished - Feb 2022
Externally publishedYes

Bibliographical note

Funding Information:
The authors thank Dr. Othmane Aouane for fruitful discussions. Financial support by the German Research Foundation (DFG) within the projects HA 4382/7-1 and KA1345/9-1 as well as the computing time granted by the Jülich Supercomputing Centre (JSC) are highly acknowledged.

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