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  • Non-Newtonian blood flow in human right coronary arteries: steady state simulations

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    Author(s)
    Johnston, BM
    Johnston, PR
    Corney, S
    Kilpatrick, D
    Griffith University Author(s)
    Johnston, Barbara M.
    Johnston, Peter R.
    Year published
    2004
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    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 ...
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    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.
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    Journal Title
    Journal of Biomechanics
    Volume
    37
    Issue
    5
    Publisher URI
    http://www.elsevier.com/wps/find/journaldescription.cws_home/321/description#description
    DOI
    https://doi.org/10.1016/j.jbiomech.2003.09.016
    Copyright Statement
    © 2004 Elsevier. This is the author-manuscript version of this paper. Reproduced in accordance with the copyright policy of the publisher. Please refer to the journal's website for access to the definitive, published version.
    Subject
    Biomedical engineering
    Mechanical engineering
    Sports science and exercise
    Publication URI
    http://hdl.handle.net/10072/5689
    Collection
    • Journal articles

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