Turbulence Characteristics Downstream of Bileaflet Aortic Valve Prostheses

[+] Author and Article Information
J. S. Liu, P. C. Lu

Department of Water Resources and Environmental Engineering, Tamkang University, Taipei, 251 Taiwan

S. H. Chu

Department of Surgery, College of Medicine, National Taiwan University, Taipei, 106 Taiwane-mail: shchu@ha.mc.ntu.edu.tw

J Biomech Eng 122(2), 118-124 (Aug 22, 1999) (7 pages) doi:10.1115/1.429643 History: Received March 24, 1998; Revised August 22, 1999
Copyright © 2000 by ASME
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(a) Schematic diagram of the hydraulic pulsatile flow model simulating the left heart and the system circulatory mock loop; (b) open configuration of a bileaflet valve in laboratory coordinate system, X1=7.8 mm,X2=13.8 mm
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Aortic pressure and left ventricular pressure at 70 beats/min
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Radial profiles of axial phase average velocity of the SJM value at X=7.8 mm,Y=0 mm
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Profiles of velocity vectors and Reynolds stresses at sections X1=7.8 mm and X2=13.8 mm, during peak systole (S5): (a) SJM; (b) CM; (c) DM
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(a) Autocorrelation coefficients and (b) normalized energy spectra at X=7.8 mm,Y=0 mm during acceleration phase (S2), peak phase (S5), and deceleration phase (S8)
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Variations of (a) the integral time scales and (b) the Taylor micro-time scales at section X=7.8 mm
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Variations of (a) the integral length scales, (b) the Taylor micro-length scales, and (c) the smallest length scales at section X=7.8 mm




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