AI Article Synopsis
- The study investigates how red blood cells (RBCs) behave when flowing through tiny capillaries, focusing on how they form clusters due to interactions between their shape, fluid flow, and adhesion forces.
- The clusters are influenced by plasma proteins, which are represented by the polymer dextran, and their stability is affected by both adhesion and the shear stresses from the flow.
- Numerical simulations show that varying flow speeds lead to different clustering behaviors, highlighting the transition from adhesive clusters, influenced by protein interactions, to non-adhesive clusters primarily driven by hydrodynamic forces.
Article Abstract
We present experiments on RBCs that flow through micro-capillaries under physiological conditions. The strong flow-shape coupling of these deformable objects leads to a rich variety of cluster formation. We show that the RBC clusters form as a subtle imbrication between hydrodynamic interactions and adhesion forces because of plasma proteins, mimicked by the polymer dextran. Clusters form along the capillaries and macromolecule-induced adhesion contributes to their stability. However, at high yet physiological flow velocities, shear stresses overcome part of the adhesion forces, and cluster stabilization due to hydrodynamics becomes stronger. For the case of pure hydrodynamic interaction, cell-to-cell distances have a pronounced bimodal distribution. Our 2D-numerical simulations on vesicles capture the transition between adhesive and non-adhesive clusters at different flow velocities.
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| http://dx.doi.org/10.1039/c6sm01165a | DOI Listing |
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