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Capillary Interactions, Aggregate Formation, and the Rheology of Particle-Laden Flows: A Lattice Boltzmann Study
journal contribution
posted on 2022-01-20, 13:35 authored by Lei Yang, Marcello Sega, Steffen Leimbach, Sebastian Kolb, Jürgen Karl, Jens HartingThe 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.
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even sand castlescoupled lattice boltzmannsuspending liquid viscositylattice boltzmann studyfluidized suspensions usingcapillary interactions promotesincreased suspension viscositycapillary suspensionscapillary interactionsfluidized bedscapillary bridgessuspension viscosityeffective viscositytransport propertiesshear rateparticles causedopposite effectladen flowsglobular clustersfirst sightfact usuallyempirical modelsdifferent systemsdecisive impactchemical reactors