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Non-Newtonian blood flow in human right coronary arteries: steady state simulations
- Source :
- Journal of Biomechanics. 37:709-720
- Publication Year :
- 2004
- Publisher :
- Elsevier BV, 2004.
-
Abstract
- This study looks at blood flow through four different right coronary arteries, which have been reconstructed from bi-plane angiograms. Five non-Newtonian blood models, as well as the usual Newtonian model of blood viscosity, are used to study the wall shear stress in each of these arteries at a particular point in the cardiac cycle. It was found that in the case of steady flow in a given artery, the pattern of wall shear stress is consistent across all models. The magnitude of wall shear stress, however, is influenced by the model used and correlates with graphs of shear stress versus strain for each model. For mid-range velocities of around 0.2 m s(-1) the models are virtually indistinguishable. Local and global non-Newtonian importance factors are introduced, in an attempt to quantify the types of flows where non-Newtonian behaviour is significant. It is concluded that, while the Newtonian model of blood viscosity is a good approximation in regions of mid-range to high shear, it is advisable to use the Generalised Power Law model (which tends to the Newtonian model in those shear ranges in any case) in order to achieve better approximation of wall shear stress at low shear.
- Subjects :
- Quantitative Biology::Tissues and Organs
Finite Element Analysis
Blood viscosity
Biomedical Engineering
Biophysics
Blood Pressure
Coronary Angiography
Sensitivity and Specificity
Physics::Fluid Dynamics
Theoretical physics
Shear stress
Newtonian fluid
Humans
Computer Simulation
Orthopedics and Sports Medicine
Shear velocity
Mathematics
Hemostasis
Rehabilitation
Models, Cardiovascular
Reproducibility of Results
Arteries
Mechanics
Blood Viscosity
Coronary Vessels
Non-Newtonian fluid
Shear rate
Nonlinear Dynamics
Generalized Newtonian fluid
Hemorheology
Shear Strength
Shear flow
Blood Flow Velocity
Subjects
Details
- ISSN :
- 00219290
- Volume :
- 37
- Database :
- OpenAIRE
- Journal :
- Journal of Biomechanics
- Accession number :
- edsair.doi.dedup.....6896a16d2ee7ef8befc923470e49b623