Turbulent Stresses in the Region of a Hancock Porcine Bioprosthetic Aortic Valve

[+] Author and Article Information
F. J. Walburn

Research Division, Miami Heart Institute, Miami Beach, Fla. 33140

H. N. Sabbah, P. D. Stein

Department of Medicine (Division of Cardiovascular Medicine), and Department of Surgery, Henry Ford Hospital, Detroit, Mich. 48202

J Biomech Eng 107(3), 200-205 (Aug 01, 1985) (6 pages) doi:10.1115/1.3138544 History: Received June 07, 1983; Revised March 18, 1985; Online June 15, 2009


The purpose of this study was to measure stresses associated with turbulence (Reynolds stresses), in the region of a 29-mm-dia porcine bioprosthetic valve (Hancock, Model 242). Studies were performed in an in vitro pulse duplicating system with the valve mounted in the aortic position. The Reynolds stresses were calculated from velocities obtained with a two channel laser Doppler anemometer. The largest Reynolds shear stress and normal stress occurred at the highest stroke volume used (80 mL). Averaged over ejection they were 38 dynes/cm2 and 380 dynes/cm2 , respectively. The maximal instantaneous Reynolds shear stress was 2500 dynes/cm2 and the maximal instantaneous Reynolds normal stress was 6800 dynes/cm2 . Stresses of these magnitudes are in the range reported to damage platelets.

Copyright © 1985 by ASME
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