Journal ArticleDOI
Effect of rheological models on the hemodynamics within human aorta: CFD study on CT image-based geometry
Safoora Karimi,Safoora Karimi,Mahsa Dabagh,P. Vasava,Mitra Dadvar,Bahram Dabir,Payman Jalali +6 more
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TLDR
Comparing the local shear stress magnitude in three branches at different critical cardiac instants shows that the shear thinning nature of blood can slightly influence WSS at diastole, in all branches.Abstract:
The pulsatile blood flow through human aortic arch and three major branches are computationally studied to investigate the effect of blood rheology on the hemodynamic parameters. The human aorta model is reconstructed from the computed tomography (CT) images of specific patient. The results of nine non-Newtonian (Casson, K-L, Modified Casson, Carreau, Carreau-Yasuda, Cross, Power-law, Modified Power-law, and Generalized Power-law) models are analyzed and compared with those of Newtonian model and reveal very interesting hemodynamic features for each model. Among the applied non-Newtonian models, the Cross model displays significantly different distribution of wall shear stress (WSS) and velocity field through the aorta at diastole. Comparing the local shear stress magnitude in three branches at different critical cardiac instants shows that the shear thinning nature of blood can slightly influence WSS at diastole, in all branches. The effect of blood rheology appears clearly in the brachiocephalic and carotid branches, at peak systole. In the high-shear rate zones, the lowest WSS is estimated by the Carreau model. The Newtonian model has close prediction to the Cross model at peak systole. The power law model predictions remain the nearest to those of the Carreau model along the cardiac cycle.read more
Citations
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Heart blood flow simulation: a perspective review.
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The numerical analysis of non-Newtonian blood flow in human patient-specific left ventricle
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A space fractional constitutive equation model for non-Newtonian fluid flow
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Effects of different non-Newtonian models on unsteady blood flow hemodynamics in patient-specific arterial models with in-vivo validation
Majid Abbasian,Mehrzad Shams,Ziba Valizadeh,Abouzar Moshfegh,Ashkan Javadzadegan,Shaokoon Cheng +5 more
TL;DR: Results from this study show that the time-averaged velocity at the centre of the arteries produced in the CFD simulations that uses the Carreau, modified Casson or Quemada blood viscosity models corresponded exceptionally well with the clinical measurements regardless of stenosis severities and highlights the usefulness of these models to determine the potential determinants of blood vessel wall integrity.
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Non-Newtonian perspectives on pulsatile blood-analog flows in a 180° curved artery model
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References
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Jeng Jiann Chiu,Shu Chien +1 more
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Journal ArticleDOI
Effects of the non-Newtonian viscosity of blood on flows in a diseased arterial vessel. Part 1: Steady flows.
Young I. Cho,Kenneth Kensey +1 more
TL;DR: The origin of the non-Newtonian viscosity of blood was discussed in relation to the viscoelasticity and yield stress of blood.
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