Dresden 2017 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 12: Focus: Soft Particles in Flows II (joint focus session CPP/DY)
CPP 12.6: Vortrag
Montag, 20. März 2017, 16:45–17:00, ZEU 160
Shapes and interaction of microcapillary RBC flow — •Alexander Kihm1, Achim Guckenberger2, Stephan Gekle2, and Christian Wagner1 — 1Saarland University, Saarbrücken, Germany — 2Bayreuth University, Bayreuth, Germany
We try to establish the phase diagram of Red Blood Cells (RBC's) flowing through a capillary, i.e. characterize their shape and position as a function of capillary dimensions and imposed flow rate (pressure drop).
Therefore, we perform microfluidic experiments, either with a simple inverted brightfield microscope or with a recently developed 3-D confocal spinning disk technique. In most cases we find a migration of cells towards the center, but above a critical flow rate off-centered positions are observed as well. In addition, we classify the shapes of flowing cells, and as categories we distinguish between slippers, croissants and other (ambiguous) shapes. The experimental data is compared to predictions obtained from numerical simulations using a boundary-integral method.