Sound-mediated dynamic correlations between colloidal particles in a quasi-one-dimensional channel

TL;DR

This paper investigates how sound waves in a confined fluid induce long-range correlations between colloidal particles, affecting their collective and pairwise dynamics in a quasi-one-dimensional channel.

Contribution

It introduces a combined simulation and theoretical approach to reveal sound-mediated hydrodynamic interactions in confined colloidal suspensions.

Findings

Long-range particle correlations due to sound propagation.

Algebraic decay of correlations over time.

Impact on collective particle dynamics.

Abstract

We study the hydrodynamic interactions between colloids suspended in a compressible fluid inside a rigid channel. Using lattice-Boltzmann simulations and a simplified hydrodynamic theory, we find that the diffusive dynamics of density perturbations (sound) in the confined fluid give rise to particle correlations of exceptionally long spatial range and algebraic temporal decay. We examine the effect of these sound-mediated correlations on two-particle dynamics and on the collective dynamics of a quasi-one-dimensional suspension.