Abstract
AbstractParticle accumulation in high‐Prandtl‐number (Pr = 68) thermocapillary liquid bridges is studied numerically. Randomly distributed small rigid non‐interacting spherical particles are found to cluster in particle accumulation structures. The accumulation is found to be caused by a finite‐particle‐size effect when the particles move close to the impermeable flow boundaries. The extra drag force experienced by a particle near the boundaries creates a dissipation in the dynamical system describing the particle motion. This causes particles to be attracted to regions in or near Kolmogorov‐Arnold‐Moser tori of the unperturbed flow field.
Highlights
Small spherical particles have been found to cluster in particle accumulation structures (PAS) in liquid bridges with Pr = 4 [1] and Pr = 28 [2]
This type of PAS is called finite-size coherent structures (FSCS) [2] and was shown to be generic for incompressible flows in which the repulsive particle–boundary interaction (PBI) forces are dominating forces on a particle acting in the bulk [3]
The flow for Pr = 68 is obtained numerically using OpenFOAM on a block-structured mesh made of ≈ 21.5 million grid points
Summary
Small spherical particles have been found to cluster in particle accumulation structures (PAS) in liquid bridges with Pr = 4 [1] and Pr = 28 [2]. This type of PAS is called finite-size coherent structures (FSCS) [2] and was shown to be generic for incompressible flows in which the repulsive particle–boundary interaction (PBI) forces are dominating forces on a particle acting in the bulk [3].
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