Cross-stream transport of asymmetric particles driven by oscillating shear

TL;DR

This paper demonstrates that asymmetric, deformable particles can undergo cross-stream migration in oscillatory shear flow, enabling potential particle sorting based on asymmetry and material properties.

Contribution

The study reveals that asymmetric elastic particles exhibit robust cross-stream migration in oscillatory shear flow, independent of initial orientation and particle size.

Findings

Cross-stream migration occurs for asymmetric elastic particles in oscillatory shear.

Migration velocity and direction are robust to initial orientation variations.

The scheme can be used for sorting particles with asymmetric properties.

Abstract

We study the dynamics of asymmetric, deformable particles in oscillatory, linear shear flow. By simulating the motion of a dumbbell, a ring polymer, and a capsule we show that cross-stream migration occurs for asymmetric elastic particles even in linear shear flow if the shear rate varies in time. The migration is generic as it does not depend on the particle dimension. Importantly, the migration velocity and migration direction are robust to variations of the initial particle orientation, making our proposed scheme suitable for sorting particles with asymmetric material properties.