Structure formation of rod-like fillers in a contraction flow

Titelangaben

Gruhn, Thomas ; Ortiz Monsalve, Camilo ; Salehi, Sahar:
Structure formation of rod-like fillers in a contraction flow.
In: Physics of Fluids. Bd. 35 (2023) Heft 4 . - 043107.
ISSN 0031-9171
DOI: https://doi.org/10.1063/5.0143006

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Abstract

Rod-like fillers in a flow field of a viscous fluid may form complex structures after passing a sudden contraction. The rods start with a dilute
distribution with random positions and orientations. Behind the contraction, a large amount of rods tumble in a spatially correlated way,
such that orientations perpendicular to the flow field occur at regular distances along the channel. The correlated tumbling results from an
interplay of several effects, the tumbling inferred by the space dependent shear flow, the accumulation of rods at a certain distance from the
wall, and the rod alignment at the contraction. The system is studied numerically for rod-like fillers in a shear-thinning viscous fluid.