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TECHNICAL PAPERS

Waveform Dependence of Pulsatile Flow in a Stenosed Channel

[+] Author and Article Information
H. Liu

Division of Computer and Information, The Institute of Physical and Chemical Research (RIKEN), 2-1 Hirosawa, Wako-shi, Saitama 351-0198, Japan

T. Yamaguchi

Department of Mechanical and Systems Engineering, Nagoya Institute of Technology, Nagoya, Japan

J Biomech Eng 123(1), 88-96 (Oct 16, 2000) (9 pages) doi:10.1115/1.1339818 History: Received February 11, 1999; Revised October 16, 2000
Copyright © 2001 by ASME
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References

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Ku,  D. N., Giddens,  D. P., Zarins,  C. K., and Glagov,  S., 1985, “Pulsatile Flow and Atherosclerosis in the Human Carotid Bifurcation: Positive Correlation Between Plague Location and Low and Oscillating Shear Stress,” Arteriosclerosis, 5, pp. 541–567.
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Figures

Grahic Jump Location
Schematic diagram of a two-dimensional stenosed channel model with a coordinate system and enlarged grid systems at the end of the indentation
Grahic Jump Location
Waveform of a generalized, physiological volumetric flow rate (Q=Ud) that varies in systolic acceleration–deceleration time ratio, η=tacc/tdec, with systolic interval fixed: (a) four waveforms of the flow rate (Q) with η=1.0(A),0.5(B),0.2(E), and 0.1(F); (b) four time courses of the acceleration of the inflow, i.e., the first derivatives of the flow rate, dQ/dt
Grahic Jump Location
Iso-speed (a) and pressure (b) contours at Re=750 and St=0.024 at ten points of the waveform (A) with η=1.0 as shown in Fig. 2(a,b): (a) t=0.11,(b)t=0.17, (b) t=0.22,(b+)t=0.26, (c) t=0.34,(d)t=0.41, (d) t=0.45,(d+)t=0.52, (e) t=0.73, and (f) t=1.0. Bright color level represents magnitudes of the speed and pressure, speed and pressure increasing from black to bright; wall shear stress (c) and pressure (d) distributions at Re=750 and St=0.024 at five points of the waveform (A) with η=1.0 as shown in Fig. 2(a,b). Note that the pressure of Poiseuille flow is also plotted in Fig. 3(d).
Grahic Jump Location
Iso-speed contours at Re=750 and St=0.024 at five points of the waveforms with η=1.0 (A), 0.5 (B), 0.2 (E), and 0.1 (F). Bright color level represents magnitudes of the speed, speed increasing from black to bright.
Grahic Jump Location
Wall shear stresses (a) on the lower wall at four points, a, b, c, and d, and pressures (b) on the centerline at two points, b and c, at Re=750 and St=0.024, with η=1.0 (A), 0.5 (B), 0.2 (E), and 0.1 (F). Note that the pressure of Poiseuille flow is also plotted in Fig. 5(b).
Grahic Jump Location
Waveform of a generalized, physiological volumetric flow rate (Q=Ud) that varies in systole-to-diastole time ratio, ξ=tsys/tdias, with systolic and diastolic form fixed. a, four waveforms of the flow rate (Q) with ξ=2.0(A),1.0(B),0.33(D),0.2(F), and 0.1(G). Note that case B here has the same waveform as that of case A in Fig. 2(a,b).
Grahic Jump Location
(a) Iso-speed contours at Re=750 and St=0.024 at point c of the waveforms with ξ=2.0 (A), 1.0 (B), 0.33 (D), 0.2 (F), and 0.1 (G). Bright color level represents magnitudes of the speed, speed increasing from black to bright; wall shear stresses (a) on the lower wall at point c and pressures (c) on the centerline, at Re=750 and St=0.024, with ξ=2.0 (A), 1.0 (B), 0.33 (D), 0.2 (F), and 0.1 (G). Note that the pressure of Poiseuille flow is also plotted in Fig. 7(c).

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