[Non-newtonian behavior of blood and parietal shear stress in a Poiseuille flow].
The authors study the blood flow in a cylindrical vessel with the consideration of the non-newtonian behaviour of blood. Supposing that the vessel's diameter and the blood velocity at the centre are known (measurable by a Doppler ultrasound velocimeter), we calculate the velocity profiles, flow rate, wall shear stress and shear rate, with 8 non-newtonian models, by a numerical method which allows us to solve the flow system for any non-newtonian fluid. The numerical results are compared with those obtained for a newtonian fluid which remains the most used model in clinical practice. This work shows the importance of the use of a realistic non-newtonian rheological relationship in the estimation of mechanical factors especially the wall shear stress in blood circulation.
Wang
X
X
URA CNRS 875-Laboratoire d'Energétique et de Mécanique Théorique et Appliquée, Vandoeuvre-lès-Nancy.
Stoltz
J F
JF
D001783:Blood Flow Velocity; D004730:Endothelium, Vascular; D006801:Humans; D008955:Models, Cardiovascular; D012212:Rheology / Q000295:instrumentation*; D013314:Stress, Mechanical
Propriétés non-newtoniennes du sang et contrainte pariétale dans un écoulement de poiseuille.