TY - GEN
T1 - Time-dependent vorticity field in vascular junctions
AU - Grad, Y.
AU - Einav, S.
PY - 1999
Y1 - 1999
N2 - Blood vessel diseases are the leading cause of morbidity and mortality. Hemodynamic related diseases and complications, such as occlusions and stenosis, are common near bifurcations and anastomosis. This work was aimed to map the details of the spatio-temporal flow characteristics near vascular junctions. Laminar to turbulent transition, flow separation, rotation and waves reflected from host artery leave characteristic spectral signature which escapes detection when only mean data is sampled. Therefore, Continuous Digital Particle Image Velocimetry (CDPIV) was used to map the flow field of vascular junctions in time. Continuous sequences of experimental images, followed by their calculated vorticity and velocity transient fields, are given as animated presentation of distensible anastomoses. High shear stress peaks and vortices were observed at the anastomosis toe. Flow reversal and separation was Reynolds (Re) dependent. Better geometrical configuration resulted in lower shear-stresses and flatter spectral distribution. This can be translated in Doppler ultrasound or sound frequencies terms and thus potentially assist clinical observations.
AB - Blood vessel diseases are the leading cause of morbidity and mortality. Hemodynamic related diseases and complications, such as occlusions and stenosis, are common near bifurcations and anastomosis. This work was aimed to map the details of the spatio-temporal flow characteristics near vascular junctions. Laminar to turbulent transition, flow separation, rotation and waves reflected from host artery leave characteristic spectral signature which escapes detection when only mean data is sampled. Therefore, Continuous Digital Particle Image Velocimetry (CDPIV) was used to map the flow field of vascular junctions in time. Continuous sequences of experimental images, followed by their calculated vorticity and velocity transient fields, are given as animated presentation of distensible anastomoses. High shear stress peaks and vortices were observed at the anastomosis toe. Flow reversal and separation was Reynolds (Re) dependent. Better geometrical configuration resulted in lower shear-stresses and flatter spectral distribution. This can be translated in Doppler ultrasound or sound frequencies terms and thus potentially assist clinical observations.
UR - http://www.scopus.com/inward/record.url?scp=0033331085&partnerID=8YFLogxK
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AN - SCOPUS:0033331085
SN - 0780356756
T3 - Annual International Conference of the IEEE Engineering in Medicine and Biology - Proceedings
SP - 192
BT - Annual International Conference of the IEEE Engineering in Medicine and Biology - Proceedings
PB - IEEE
T2 - Proceedings of the 1999 IEEE Engineering in Medicine and Biology 21st Annual Conference and the 1999 Fall Meeting of the Biomedical Engineering Society (1st Joint BMES / EMBS)
Y2 - 13 October 1999 through 16 October 1999
ER -