The superposition of steady on oscillatory shear and its effect on the viscoelasticity of human blood and a blood-like model fluid

Biorheology
G VlastosB Koch

Abstract

To understand the pulsatility of human blood flow in vivo, it is necessary to separately investigate (1) steady shear and oscillatory flow, and (2) the superposition of steady shear flow on oscillatory flow performed under in vitro conditions. In this study a variable steady shear rate was superimposed in parallel on oscillatory shear at a constant frequency (0.5 Hz) for human blood (45% hematocrit), and an aqueous polyacrylamide polymer solution (AP 30E, concentration 300 ppm). The effect of superposition of the above two shear flows on the viscoelasticity of blood was more pronounced for the elastic (eta") than for the viscous (eta') component of viscoelasticity. With increasing superimposed shear rate, both eta' and eta" decreased, especially at the low shear region. This behavior can be explained by the viscoelastic properties of blood and the phenomenon of blood aggregation and disaggregation. Quantitatively, the dependence of the viscous component of complex viscosity on superimposed shear for both blood and polymer solution is described by a modified Carreau equation. The elastic component of complex viscosity decreased exponentially with increasing superimposed shear, and it is described by an exponential model.

References

Mar 1, 1975·Microvascular Research·G B Thurston
Jan 1, 1980·Annual Review of Physiology·G R Cokelet
Sep 1, 1994·Biomedizinische Technik. Biomedical Engineering·S WernerB Koch

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Citations

Nov 1, 2005·Journal of Colloid and Interface Science·Konstantin G Kornev, Alexander V Neimark
Oct 19, 2006·Ultrasound in Medicine & Biology·Jean-Luc GennissonGuy Cloutier
Dec 29, 2007·Proceedings of the Institution of Mechanical Engineers. Part H, Journal of Engineering in Medicine·E Kaliviotis, M Yianneskis

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