Presidential address: A brief history of arterial blood flow—from Harvey and Newton to computational analysis Joseph P. Archie, PhD, MD Journal of Vascular.

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Presentation transcript:

Presidential address: A brief history of arterial blood flow—from Harvey and Newton to computational analysis Joseph P. Archie, PhD, MD Journal of Vascular Surgery Volume 34, Issue 3, Pages 398-404 (September 2001) DOI: 10.1067/mva.2001.116108 Copyright © 2001 Society for Vascular Surgery and The American Association for Vascular Surgery Terms and Conditions

Fig. 1 Newton's law of shear states that shearing forces (shear stress) are equal to the fluid's viscosity times the spatial velocity gradient. In this schematic illustrating fluid shear stress on the wall, the spatial velocity gradient is ΔV/ΔR where V is velocity and R is radial distance from wall. In the fluid away from the wall, fluid shear stress approaches zero as ΔV/ΔR becomes small. Journal of Vascular Surgery 2001 34, 398-404DOI: (10.1067/mva.2001.116108) Copyright © 2001 Society for Vascular Surgery and The American Association for Vascular Surgery Terms and Conditions

Fig. 2 Three-dimensional carotid bifurcation that has been divided into 58,000 nodes or grids. Computational analysis gives solutions for pressures, velocities, and shear stresses, as well as their spatial and temporal gradients at each node. Grids as small as 60 μm in linear dimension can be used. (Unpublished computational analysis results of S. Hyun, C. Kleinstreuer, and J. P. Archie, 2000.) Journal of Vascular Surgery 2001 34, 398-404DOI: (10.1067/mva.2001.116108) Copyright © 2001 Society for Vascular Surgery and The American Association for Vascular Surgery Terms and Conditions

Fig. 3 Color-coded mid-plane velocities at end systole are given in a carotid bifurcation. There are complex flow patterns throughout bulb segment. (Unpublished computational analysis results of S. Hyun, C. Kleinstreuer, and J. P. Archie, 2000.) Journal of Vascular Surgery 2001 34, 398-404DOI: (10.1067/mva.2001.116108) Copyright © 2001 Society for Vascular Surgery and The American Association for Vascular Surgery Terms and Conditions

Fig. 4 Color-coded wall shear stresses (top ) and wall shear stress deviations or gradient (bottom ) are given in carotid bifurcation at end systole. (Unpublished computational analysis results of S. Hyun, C. Kleinstreuer, and J. P. Archie, 2000.) Journal of Vascular Surgery 2001 34, 398-404DOI: (10.1067/mva.2001.116108) Copyright © 2001 Society for Vascular Surgery and The American Association for Vascular Surgery Terms and Conditions

Fig. 5 Computational analysis of particle deposition on the wall of a carotid bifurcation. At top left 15,000 microparticles are introduced into the distal common carotid artery. (Methodology from reference 15, unpublished figure.) Journal of Vascular Surgery 2001 34, 398-404DOI: (10.1067/mva.2001.116108) Copyright © 2001 Society for Vascular Surgery and The American Association for Vascular Surgery Terms and Conditions