Frequency Dependence of Dynamic Curvature Effects on Flow Through Coronary Arteries

[+] Author and Article Information
James E. Moore, Erlend S. Weydahl, Aland Santamarina

Mechanical Engineering Department, Biomedical Engineering Institute, Florida International University, 10555 West Flagler Street, Miami, FL 33174

J Biomech Eng 123(2), 129-133 (Nov 01, 2000) (5 pages) doi:10.1115/1.1351806 History: Received February 01, 2000; Revised November 01, 2000
Copyright © 2001 by ASME
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Grahic Jump Location
Illustration of the deforming curved tube flow situation of interest. The entry to the tube was fixed and the radius of curvature was varied sinusoidally in time. The computational mesh is shown at left.
Grahic Jump Location
Radius of curvature as a function of time for a coronary artery as measured by bi-planar angiography, adapted from Gross et al. 8. A Fourier transform of the waveform is shown in the inset. The magnitudes have been normalized with respect to the mean radius of curvature.
Grahic Jump Location
Wall shear rate as a function of axial position at the (a) inner wall of curvature, (b) mid wall, and (c) outer wall at four different points in time for the case δ=0.08, ε=50 percent. The radius of curvature was a cosine function of time, so t=0 corresponds to the maximum radius of curvature, and T is the period.
Grahic Jump Location
Normalized wall shear rate amplitude (NWSRA) versus axial position for the (a) inner wall of curvature, (b) mid-wall, and (c) outer wall for the case δ=0.08, ε=50 percent. The greatest variation in shear rate was at the mid wall of curvature for the deformation frequency of 5 Hz.
Grahic Jump Location
Maximum inner wall NWSRA found within the first ten tube diameters as a function of the dimensionless group εδα. Data from both the 1 Hz (solid diamonds) and 5 Hz (hollow circles) simulations are included. The effects of dynamic curvature were found to scale well with this parameter.



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