Time-dependent vorticity field in vascular junctions

Y. Grad, S. Einav

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

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.

Original languageEnglish
Title of host publicationAnnual International Conference of the IEEE Engineering in Medicine and Biology - Proceedings
PublisherIEEE
Pages192
Number of pages1
ISBN (Print)0780356756
StatePublished - 1999
EventProceedings 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) - Atlanta, GA, USA
Duration: 13 Oct 199916 Oct 1999

Publication series

NameAnnual International Conference of the IEEE Engineering in Medicine and Biology - Proceedings
Volume1
ISSN (Print)0589-1019

Conference

ConferenceProceedings 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)
CityAtlanta, GA, USA
Period13/10/9916/10/99

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