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Laser Doppler Velocimetry and Flow Visualization Studies in the Regurgitant Leakage Flow Region of Three Mechanical Mitral Valves
Author(s) -
Meyer Richard S.,
Deutsch Steven,
Bachmann Christopher B.,
Tarbell John M.
Publication year - 2001
Publication title -
artificial organs
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.684
H-Index - 76
eISSN - 1525-1594
pISSN - 0160-564X
DOI - 10.1046/j.1525-1594.2001.06700.x
Subject(s) - laser doppler velocimetry , flow visualization , streak , turbulence , mechanics , vortex , materials science , particle image velocimetry , reynolds number , velocimetry , flow (mathematics) , physics , medicine , blood flow , optics , cardiology
Streak line flow visualization and laser Doppler velocimetry (LDV) were conducted in the regurgitant leakage flow region of 3 mechanical heart valve types: CarboMedics, Medtronic Hall, and St. Jude Medical. Streak line flow visualization identified regions of high regurgitant flow, and LDV measurements were focused on those locations. Maximum regurgitant flow velocities after valve closure ranged from 0.7 to 2.6 m/s, and maximum Reynolds shear stress after valve closure ranged from 450 to 3,600 dyne/cm 2 . These data indicate that leakage flows can generate turbulent jets with elevated Reynolds stresses even in bileaflet valves.