Abstract
The blood inner structure is during the flow in large vessels permanently in a nonequilibrium state due to the pulsating character of the flow and the downstream changes of the shear rates. Both the pulsatility and the shear rate changes are advantageous with respect to the blood apparent viscosity which is thus lower than would be under steady flow conditions. The susceptibility of blood to the mechanical liquidization results from its shear thinning and thixotropy. Viscoelastic time-dependent effects seem to have only secondary importance as follows from the flow analysis. The corresponding representation of blood rheological behavior for this purpose was based on the structural constitutive equation of the rate type with a kinetic equation describing the structure changes.
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