Hydrodynamic interactions of colloidal spheres under shear flow

Details Hydrodynamic interactions of colloidal spheres under shear flow Hydrodynamic interactions of colloidal spheres under shear flow

2012-03-15

arxiv.org/abs/1203.3441v1

Physics

Condensed Matter

Soft Condensed Matter

12 pages, 7 figures, for proceedings of CODEF III conference

Scientific paper

Particles that are immersed in a fluid exchange momentum via the fluid, hence their Brownian motion is correlated. By means of multiparticle-collision dynamics simulations we study the interactions between two colloidal beads in a sheared fluid suspension. Recently, this topic has been addressed in experiments on colloidal particles trapped by optical tweezers in a microfluidic device [PRL, 103, 230602 (2009)] and theoretically by means of a Langevin model [Eur. Phys. J E, 33, 313 (2010)]. Although we neglect the rotational degrees of freedom of the colloids, and employ a very simple coupling between the colloids and the flow field, we can reproduce the experimental data and partly explain why it differs from theory.

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