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Instabilities and particle-induced patterns in co-rotating suspension Taylor–Couette flow
Published online by Cambridge University Press: 19 September 2024
Abstract
The first experimental results on pattern transitions in the co-rotation regime (i.e. the rotation ratio $\varOmega = \omega _o/\omega _i > 0$, where
$\omega _i$ and
$\omega _o$ are the angular speeds of the inner and outer cylinders, respectively) of the Taylor–Couette flow (TCF) are reported for a neutrally buoyant suspension of non-colloidal particles, up to a particle volume fraction of
$\phi = 0.3$. While the stationary Taylor vortex flow (TVF) is the primary bifurcating state in dilute suspensions (
$\phi \leq ~0.05$), the non-axisymmetric oscillatory states, such as the spiral vortex flow (SVF) and the ribbon (RIB), appear as primary bifurcations with increasing particle loading, with an overall de-stabilization of the primary bifurcating states (TVF/SVF/RIB) being found with increasing
$\phi$ for all
$\varOmega \geq ~0$. At small co-rotations (
$\varOmega \sim 0$), the particles play the dual role of stabilization (
$\phi < 0.1$) and destabilization (
$\phi \geq ~0.1$) on the secondary/tertiary oscillatory states. The distinctive features of the ‘particle-induced’ spiral vortices are identified and contrasted with those of the ‘fluid-induced’ spirals that operate in the counter-rotation regime.
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- © The Author(s), 2024. Published by Cambridge University Press