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TECHNICAL PAPERS: Fluids/Heat/Transport

Time-Resolved DPIV Analysis of Vortex Dynamics in a Left Ventricular Model Through Bileaflet Mechanical and Porcine Heart Valve Prostheses

[+] Author and Article Information
Olga Pierrakos, Pavlos P. Vlachos

Department of Mechanical Engineering School of Biomedical Engineering

Demetri P. Telionis

Department of Engineering Science and Mechanics School of Biomedical Engineering and Sciences Virginia Tech, 219 Norris Hall Blacksburg, VA 24061

J Biomech Eng 126(6), 714-726 (Feb 04, 2005) (13 pages) doi:10.1115/1.1824124 History: Received April 17, 2003; Revised June 08, 2004; Online February 04, 2005
Copyright © 2004 by ASME
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Figures

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Time-varying results of streamline distributions for the anatomical orientation. The time instants are T=0, 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, and 0.9 s. For the first three time instants, the specified regions have been enlarged to show the velocity field and vorticity distribution. Please note that in the electronic version of the paper, the figures can be enlarged so that the information provided can be studied in greater detail.
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Schematic of domain segmentation observed in all three configurations. Locations of regions I, II, and III are shown as well are vortices A and B.
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Time-varying results of streamline distributions for the anti-anatomical orientation. The time instants are T=0, 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, and 0.9 s. For the first three time instants, the specified regions have been enlarged to show the velocity field and vorticity distribution.
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Time-varying results of streamline distributions for the porcine configuration. The time instants are T=0, 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, and 0.9 s. For the first three time instants, the specified regions have been enlarged to show the velocity field and vorticity distribution.
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(a) Schematic of the mock circulatory loop showing locations for flow rate sensors and pressure transducers; (b) flow rate waveform downstream of the aortic valve; (c) pressure waveform downstream of the aortic valve
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The two St. Jude Medical bileaflet mechanical heart valve orientations studied: (a) anatomical (leaflets open similar to the natural mitral leaflets) and (b) anti-anatomical (leaflets perpendicular to the natural mitral leaflets, therefore, 90 deg clockwise of the anatomical orientation). (c) Location of the five planes along the span of the LV. Results and data analysis of plane 1, center plane dividing the LV in half, is presented in this paper.
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Time-averaged vorticity contours (a)–(c) and velocity distributions (d)–(f) over one heart cycle for the three configurations, respectively (a) and (d) anatomical, (b) and (e) anti-anatomical, and (c) and (f) porcine
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Plot of instantaneous, nondimensional circulation (left) for one heart cycle calculated over the rectangular area upstream of the AV (right) for the three cases of anatomical, anti-anatomical, and porcine configurations
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Schematic of the flow inside the natural left ventricle (LV). (a) A symmetric inlet vortex distribution; (b) actual vortical field entering the LV and the redirection of the flow in accordance to the shape of the LV.
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(a) Anticipated flow field for a symmetric mitral jet past a SJM MHV. (b) Actual observed flow field past SJM MHVs in the LV via TRDPIV, the schematic serves to illustrate the underlying physics of the Biot–Savart law.

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