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024 7 _ |a 10.1111/micc.12668
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024 7 _ |a 1549-8719
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100 1 _ |a Chien, Wei
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245 _ _ |a Effect of cytosol viscosity on the flow behavior of red blood cell suspensions in microvessels
260 _ _ |a Malden, MA [u.a.]
|c 2021
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520 _ _ |a ObjectiveThe flow behavior of blood is strongly affected by red blood cell (RBC) properties, such as the viscosity ratio C between cytosol and suspending medium, which can significantly be altered in several pathologies (e.g. sickle‐cell disease, malaria). The main objective of this study is to understand the effect of C on macroscopic blood flow properties such as flow resistance in microvessels, and to link it to the deformation and dynamics of single RBCs.MethodsWe employ mesoscopic hydrodynamic simulations to investigate flow properties of RBC suspensions with different cytosol viscosities for various flow conditions in cylindrical microchannels.ResultsStarting from a dispersed cell configuration which approximates RBC dispersion at vessel bifurcations in the microvasculature, we find that the flow convergence and development of RBC‐free layer (RBC‐FL) depend only weakly on C, and require a convergence length in the range of 25D–50D, where D is channel diameter. In vessels with urn:x-wiley:10739688:media:micc12668:micc12668-math-0001, the final resistance of developed flow is nearly the same for C = 5 and C = 1, while for urn:x-wiley:10739688:media:micc12668:micc12668-math-0002, the flow resistance for C = 5 is about 10% larger than for C = 1. The similarities and differences in flow resistance can be explained by viscosity‐dependent RBC‐FL thicknesses, which are associated with the viscosity‐dependent dynamics of single RBCs.ConclusionsThe weak effect on the flow resistance and RBC‐FL explains why RBCs can contain a high concentration of hemoglobin for efficient oxygen delivery, without a pronounced increase in the flow resistance. Furthermore, our results suggest that significant alterations in microvascular flow in various pathologies are likely not due to mere changes in cytosolic viscosity.
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700 1 _ |a Gompper, Gerhard
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700 1 _ |a Fedosov, Dmitry A.
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773 _ _ |a 10.1111/micc.12668
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