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@ARTICLE{Chien:888289,
author = {Chien, Wei and Gompper, Gerhard and Fedosov, Dmitry A.},
title = {{E}ffect of cytosol viscosity on the flow behavior of red
blood cell suspensions in microvessels},
journal = {Microcirculation},
volume = {28},
number = {2},
issn = {1549-8719},
address = {Malden, MA [u.a.]},
publisher = {Wiley},
reportid = {FZJ-2020-04815},
pages = {e12668},
year = {2021},
abstract = {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.},
cin = {IBI-5},
ddc = {610},
cid = {I:(DE-Juel1)IBI-5-20200312},
pnm = {5243 - Information Processing in Distributed Systems
(POF4-524)},
pid = {G:(DE-HGF)POF4-5243},
typ = {PUB:(DE-HGF)16},
pubmed = {33131140},
UT = {WOS:000591571900001},
doi = {10.1111/micc.12668},
url = {https://juser.fz-juelich.de/record/888289},
}