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TECHNICAL PAPERS: Fluids/Heat/Transport

Wall Shear-Rate Estimation Within the 50cc Penn State Artificial Heart Using Particle Image Velocimetry

[+] Author and Article Information
Pramote Hochareon, Keefe B. Manning, Arnold A. Fontaine

The Pennsylvania State University, Department of Bioengineering, University Park, PA 16802

John M. Tarbell

The City College of New York, Department of Biomedical Engineering, New York, NY 10031

Steven Deutsch

The Pennsylvania State University, Department of Bioengineering, University Park, PA 16802

J Biomech Eng 126(4), 430-437 (Sep 27, 2004) (8 pages) doi:10.1115/1.1784477 History: Received July 28, 2003; Revised January 21, 2004; Online September 27, 2004
Copyright © 2004 by ASME
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References

Figures

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Illustration of the perspective projection, the dark arrow on the image plane is the vector obtained from perspective projection, the dashed arrow (to the right of the image plane) is the correct projection of the displacement vector on the XY plane.
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PIV image (a) before and (b) after zero-masking.
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The illustration of the fluid centroid shift: the gray area represents the fluid region, the dashed square indicates the interrogation window for the vector at the center of the window, and the dashed arrow in each dashed box shows the vector location being shifted to the centroid of the fluid part of the interrogation window.
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Wall coordinate systems: S—surface, r—normal axis pointing into the fluid domain, t—tangential axis pointing in counter-clockwise direction, and O—origins. The imaged plane is 5 mm from the frontal edge.
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Four velocity fields used for the simulations: (a) a linear profile on a straight surface, (b) a quadratic profile on a straight surface, (c) a linear profile on a curved surface, and (d) a quadratic profile on a curved surface.
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Simulation of a linear boundary layer profile on a straight surface; dashed lines represent the results of zero masked images, dotted lines represent the results of non-zero masked images, and the numbers indicate the interrogation window size.
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The average velocity maps from the two measurement locations within the artificial heart chamber: (left) mitral view at 200 ms, (right) bottom view at 300 ms after the onset of filling.
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The wall displacement and wall shear-rate of the lateral wall (straight surface) of the mitral port obtained by two different interrogation window sizes.
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The wall displacement and wall shear-rate of the bottom wall (curved surface) of the main chamber obtained by two different interrogation window sizes.

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