An analysis of turbulent shear stresses in leakage flow through a bileaflet mechanical prostheses.
In this work, estimates of turbulence were made from pulsatile flow laser Doppler velocimetry measurements using traditional phase averaging and averaging after the removal of cyclic variation. These estimates were compared with estimates obtained from steady leakage flow LDV measurements and an analytical method. The results of these studies indicate that leakage jets which are free and planar in shape may be more unstable than other leakage jets, and that cyclic variation does not cause a gross overestimation of the Reynolds stresses at large distances from the leakage jet orifice.
Travis
Brandon R
BR
School of Chemical Engineering, Georgia Institute of Technology and Emory University, Atlanta 30332, USA.
Leo
Hwa L
HL
Shah
Parina A
PA
Frakes
David H
DH
Yoganathan
Ajit P
AP
D001783:Blood Flow Velocity; D004548:Elasticity; D019544:Equipment Failure Analysis / Q000379:methods*; D006350:Heart Valve Prosthesis; D006439:Hemodynamics; D017078:Laser-Doppler Flowmetry; D008955:Models, Cardiovascular; D017711:Nonlinear Dynamics; D010507:Periodicity; D011673:Pulsatile Flow; D013314:Stress, Mechanical; D018924:Vascular Capacitance; D014655:Vascular Resistance