Non-Newtonian Effect of Blood in Physiologically Realistic Pulsatile Flow
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In this paper the non-Newtonian effects of blood on flow features are studied in stenosis arteries. Two axisymmetric stenosis models were constructed with area reduction of 50% and 75%. A measured human common carotid artery blood flow waveform was used as the upstream flow condition which has a mean Reynolds number of 300. The assumption of laminar flow is considered for modeling. Numerical simulations in which grids are adapted corresponding to velocity profiles are used to solve the equations. The corresponding numerical predictions for Newtonian fluids were compared with the experimental flow patterns. The results indicate a satisfactory agreement in both quality and quantity. The same model is then used for blood as a non-Newtonian fluid. Two rheological models, power law and carreau fluid, are studied for comparing the wall shear stress and velocity profiles in the post stenotic region. The results indicate that other than the differences between Newtonian and non-Newtonian models, various non-Newtonian models display different flow patterns. Therefore to realize the pulsatile flow behavior in stenosis arteries, the actual rheological model should be considered.
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