Particle image velocimetry in the investigation of flow past artificial heart valves

1994 ◽  
Vol 22 (3) ◽  
pp. 307-318 ◽  
Author(s):  
W. L. Lim ◽  
Y. T. Chew ◽  
T. C. Chew ◽  
H. T. Low
Keyword(s):  
Particle Image Velocimetry ◽  
Artificial Heart ◽  
Heart Valves ◽  
Particle Image ◽  
Flow Past ◽  
Image Velocimetry ◽  
Artificial Heart Valves

Fluid Dynamic Analysis of the 50 cc Penn State Artificial Heart Under Physiological Operating Conditions Using Particle Image Velocimetry

2004 ◽  
Vol 126 (5) ◽  
pp. 585-593 ◽  
Author(s):  
Pramote Hochareon ◽  
Keefe B. Manning ◽  
Arnold A. Fontaine ◽  
John M. Tarbell ◽  
Steven Deutsch
Keyword(s):  
Particle Image Velocimetry ◽  
Artificial Heart ◽  
Particle Image ◽  
Flow Fields ◽  
Design Tool ◽  
Operating Conditions ◽  
Shear Rates ◽  
Heart Chamber ◽  
Image Velocimetry ◽  
Penn State

In order to bridge the gap of existing artificial heart technology to the diverse needs of the patient population, we have been investigating the viability of a scaled-down design of the current 70 cc Penn State artificial heart. The issues of clot formation and hemolysis may become magnified within a 50 cc chamber compared to the existing 70 cc one. Particle image velocimetry (PIV) was employed to map the entire 50 cc Penn State artificial heart chamber. Flow fields constructed from PIV data indicate a rotational flow pattern that provides washout during diastole. In addition, shear rate maps were constructed for the inner walls of the heart chamber. The lateral walls of the mitral and aortic ports experience high shear rates while the upper and bottom walls undergo low shear rates, with sufficiently long exposure times to potentially induce platelet activation or thrombus formation. In this study, we have demonstrated that PIV may adequately map the flow fields accurately in a reasonable amount of time. Therefore, the potential exists of employing PIV as a design tool.

scholarly journals Fluid Dynamic Assessment of Three Polymeric Heart Valves Using Particle Image Velocimetry

2006 ◽  
Vol 34 (6) ◽  
pp. 936-952 ◽  
Author(s):  
Hwa Liang Leo ◽  
Lakshmi Prasad Dasi ◽  
Josie Carberry ◽  
Hélène A. Simon ◽  
Ajit P. Yoganathan
Keyword(s):  
Particle Image Velocimetry ◽  
Heart Valves ◽  
Particle Image ◽  
Fluid Dynamic ◽  
Dynamic Assessment ◽  
Image Velocimetry

scholarly journals The PIV study of air flow past the counter-swirler 53983

2018 ◽  
Vol 168 ◽  
pp. 05004 ◽  
Author(s):  
Daniel Duda
Keyword(s):  
Reynolds Number ◽  
Particle Image Velocimetry ◽  
Shear Layer ◽  
Particle Image ◽  
Contact Region ◽  
Air Flow ◽  
Swirling Jets ◽  
Flow Past ◽  
Image Velocimetry ◽  
Band Pass

PIV (particle image velocimetry) measurement of the air flow past a counter-swirler 53983 (anticlockwise swirler surrounded by clockwise swirler) is performed. The measurement is focused to an area at the boundary between the inner swirling jet and the outer one rotating oppositely. The Reynolds number Re based on the inner swirler diameter ranged form 1.2·103 to 2.1·104. By using band pass filtering the shear layer and vortices in the contact region between counter-swirling jets is highlighted. The shear layer between these regions shortens and decays into vortices as Reynolds number increases.

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

2004 ◽  
Vol 126 (4) ◽  
pp. 430-437 ◽  
Author(s):  
Pramote Hochareon ◽  
Keefe B. Manning ◽  
Arnold A. Fontaine ◽  
John M. Tarbell ◽  
Steven Deutsch
Keyword(s):  
Particle Image Velocimetry ◽  
Shear Rate ◽  
Artificial Heart ◽  
Particle Image ◽  
Design Procedure ◽  
Interrogation Window ◽  
Wall Shear Rate ◽  
Image Velocimetry ◽  
Penn State ◽  
Wall Shear

Particle image velocimetry (PIV) has been gaining acceptance as a routine tool to evaluate the flow fields associated with fluid mechanical devices. We have developed algorithms to investigate the wall shear-rates within the 50cc Penn State artificial heart using low magnification, conventional particle image velocimetry (PIV). Wall shear has been implicated in clot formation, a major post-implant problem with artificial hearts. To address the issues of wall scattering and incomplete measurement volumes, associated with near wall measurements, we have introduced a zero masking and a fluid centroid shifting technique. Simulations using different velocity fields were conducted with the techniques to assess their viability. Subsequently, the techniques were applied to the experimental data collected. The results indicate that the size of the interrogation region should be chosen to be as small as possible to maximize resolution while large enough to ensure an adequate number of particles per region. In the current study, a 16×16 interrogation window performed well with good spatial resolution and particle density for the estimation of wall shear rate. The techniques developed with PIV allow wall shear-rate estimates to be obtained from a large number of sites at one time. Because a planar image of a flow field can be determined relatively rapidly, PIV may prove useful in any preliminary design procedure.

Sign in / Sign up

Export Citation Format

Share Document