Turbulent shear stress measurements in the vicinity of aortic heart valve prostheses

1986 ◽  
Vol 19 (6) ◽  
pp. 433-442 ◽  
Author(s):  
Ajit P. Yoganathan ◽  
Yi-Ren Woo ◽  
Hsing-Wen Sung
Keyword(s):  
Shear Stress ◽  
Heart Valve ◽  
Turbulent Shear ◽  
Stress Measurements ◽  
Heart Valve Prostheses ◽  
Aortic Heart Valve ◽  
Turbulent Shear Stress ◽  
Valve Prostheses

scholarly journals In vitro comparison of aortic heart valve prostheses

1988 ◽  
Vol 96 (6) ◽  
pp. 952-961 ◽  
Author(s):  
Erwin Knott ◽  
Helmut Reul ◽  
Martin Knoch ◽  
Ulrich Steinseifer ◽  
Günter Rau
Keyword(s):  
Heart Valve ◽  
Heart Valve Prostheses ◽  
Aortic Heart Valve ◽  
Valve Prostheses ◽  
In Vitro Comparison

Model Studies at Mechanical Aortic Heart Valve Prostheses—Part I: Steady-State Flow Fields and Pressure Loss Coefficients

1988 ◽  
Vol 110 (4) ◽  
pp. 334-343 ◽  
Author(s):  
Martin Knoch ◽  
Helmut Reul ◽  
Ralf Kro¨ger ◽  
Gu¨nter Rau
Keyword(s):  
Heart Valve ◽  
Vortex Formation ◽  
Flow Fields ◽  
Turbulent Shear ◽  
Human Aorta ◽  
Shear Stresses ◽  
Scaled Model ◽  
Jude Medical ◽  
Heart Valve Prostheses ◽  
Valve Prostheses

In a 3:1 scaled model of the human aorta models of the Omniscience, Bjo¨rk-Shiley Convexo-Concave, Bjo¨rk-Shiley Monostrut, Medtronic-Hall, Duromedics (Hemex) and the Saint Jude Medical heart valve prostheses are studied in steady flow representing the systolic peak flow phase. Detailed flow visualization experiments show flow separations at all inner ring surfaces as well as at most of the occluders. The resulting stagnation areas increase the risk of thrombus accumulation. Flow separations also stimulate vortex formation and turbulent mixing at the downstream jet boundaries and thus may intensify blood damage by turbulent shear stresses. The different influences of struts and occluder guides on the flow around the occluders are discussed. The effects of the individual valve components on the flow fields are analyzed and correlated with the resulting pressure losses.

scholarly journals In vitro comparison of bileaflet aortic heart valve prostheses

1993 ◽  
Vol 106 (3) ◽  
pp. 412-420 ◽  
Author(s):  
Helmut Reul ◽  
Jacques A.M. van Son ◽  
Ulrich Steinseifer ◽  
Bernhard Schmitz ◽  
Anselm Schmidt ◽  
...  
Keyword(s):  
Heart Valve ◽  
Heart Valve Prostheses ◽  
Aortic Heart Valve ◽  
Valve Prostheses ◽  
In Vitro Comparison
Sign in / Sign up

Export Citation Format

Share Document