An Analysis of Turbulent Shear Stresses in Leakage Flow Through a Bileaflet Mechanical Prostheses

[+] Author and Article Information
Brandon R. Travis

School of Chemical Engineering

Hwa L. Leo, Parina A. Shah

School of Mechanical Engineering

David H. Frakes, Ajit P. Yoganathan

School of Biomedical Engineering, Georgia Institute of Technology and Emory University, Atlanta, GA 30332

J Biomech Eng 124(2), 155-165 (Mar 29, 2002) (11 pages) doi:10.1115/1.1448519 History: Received February 05, 2001; Revised November 05, 2001; Online March 29, 2002
Copyright © 2002 by ASME
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(a) Mechanism of phase window averaging, where the standard deviation of velocity measurements within a phase window are used to define the fluctuating component of velocity. (b) A potential problem with the use of this technique, where variance in velocity occurs due to slightly different closure of the valve from cycle to cycle. In cycle 1, the valve closes such that the leakage jet travels through the sample volume. In cycle two, the valve closes slightly differently, such that the jet does not go through the sample volume.
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Characteristics of a bileaflet mechanical prosthesis, emphasizing the pivot gap orifice
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(a) Steady and (b) pulsatile flow circuits used in studies
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Measurement area in (a) steady flow experiment and (b) pulsatile experiment. Measurements were obtained 1 mm proximal to the valve pivot guards in steady and leakage flow. The approximate location and size of the five jets observed in the LDV experiments are labeled in gray by numbers used to describe them in the text. These locations and sizes are not to scale.
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Aortic and ventricular pressure traces in pulsatile experiment
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Vector plots of the pulsatile leakage jet results color coded by turbulent shear stress (a) determined by simple ensemble averaging and (b) determined by cyclic averaging
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Vector plot of the steady leakage results color coded by turbulent shear stress
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Turbulent shear stress profiles calculated from jet theory for (a) jet 4 and (b) jet 1.



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