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DY: Fachverband Dynamik und Statistische Physik

DY 7: Soft Particles in Flows I (Focus session, joint DY/CPP)

DY 7.3: Vortrag

Montag, 20. März 2017, 11:00–11:15, ZEU 160

Clustering of microscopic particles in stenosed blood flow — •Christian Bächer, Lukas Schrack, and Stephan Gekle — Biofluid Simulation and Modeling, University of Bayreuth, Germany

A mixed suspension of red blood cells and microparticles flows through a cylindrical channel with a constriction mimicking a stenosed blood vessel. Our three-dimensional Lattice-Boltzmann simulations show that the red blood cells are depleted right ahead and after the constriction. For the red blood cells the axial concentration profile is very similar to that of isolated tracer particles flowing along the central axis. Most importantly, however, we find that the stiff microparticles exhibit the opposite behavior. Arriving on a marginated position near the channel wall, they can pass through the constriction only if they find a suitable gap to dip into the dense plug of red blood cells occupying the channel center. This leads to a prolonged dwell time and, as a consequence, to a pronounced increase in microparticle concentration right in front of the constriction. Similar clustering events occur for marginated particles in a cylindrical channel branching into two daughter channels.