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Issue 10, 2020
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Irreversible hydrodynamic trapping by surface rollers

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Abstract

A colloidal particle driven by externally actuated rotation can self-propel parallel to a rigid boundary by exploiting the hydrodynamic coupling that surfaces induce between translation and rotation. As such a roller moves along the boundary it generates local vortical flows, which can be used to trap and transport passive cargo particles. However, the details and conditions for this trapping mechanism have not yet been fully understood. Here, we show that the trapping of cargo is accomplished through time-irreversible interactions between the cargo and the boundary, leading to its migration across streamlines into a steady flow vortex next to the roller. The trapping mechanism is explained analytically with a two dimensional model, investigated numerically in three dimensions for a wide range of parameters and is shown to be analogous to the deterministic lateral displacement (DLD) technique used in microfluidics for the separation of differently sized particles. The several geometrical parameters of the problem are analysed and we predict that thin, disc-like rollers offer the most favourable trapping conditions.

Graphical abstract: Irreversible hydrodynamic trapping by surface rollers

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Supplementary files

Article information


Submitted
12 Nov 2019
Accepted
13 Feb 2020
First published
27 Feb 2020

Soft Matter, 2020,16, 2611-2620
Article type
Paper

Irreversible hydrodynamic trapping by surface rollers

A. Chamolly, E. Lauga and S. Tottori, Soft Matter, 2020, 16, 2611 DOI: 10.1039/C9SM02250C

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