| Visualization of vortex shedding at the proximal side-to-end artery-graft anastomosis. | |
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MedLine Citation:
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PMID: 8977657 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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The motion of guanine particles was recorded by video to visualize transitional flow phenomena in models of a proximal side-to-end anastomosis. Close examination of successive video fields revealed that above a critical Reynolds number, particles were periodically shed into the graft from a vortex situated near the anastomosis heel, and this disturbed the flow patterns in the graft causing vortex shedding to occur near to the toe of the anastomosis. The images clearly demonstrated that periodic flow structures propagated distally along the graft for over 15 tube diameters from the proximal anastomosis. The frequency of the vortex shedding was found to increase with Reynolds number. Under pulsatile conditions, the primary vortex at the heel of the anastomosis became unstable during the deceleration phase of the flow cycle and particles were shed downstream into the graft. Although it was possible briefly to observe the characteristic banded structure in the bypass graft, the flow patterns were highly three-dimensional and were quickly broken up by the accelerating flow. Dynamic flow visualization using guanine particles was found to be a complementary technique to particle tracer flow visualization and was highly effective in identifying transitional flow phenomena and the mass transport mechanisms associated with them. |
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Authors:
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P E Hughes; A P Shortland; T V How |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't |
Journal Detail:
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Title: Biorheology Volume: 33 ISSN: 0006-355X ISO Abbreviation: Biorheology Publication Date: 1996 Jul-Oct |
Date Detail:
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Created Date: 1997-01-31 Completed Date: 1997-01-31 Revised Date: 2006-11-15 |
Medline Journal Info:
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Nlm Unique ID: 0372526 Medline TA: Biorheology Country: UNITED STATES |
Other Details:
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Languages: eng Pagination: 305-17 Citation Subset: IM |
Affiliation:
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Department of Clinical Engineering, University of Liverpool, UK. |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Anastomosis, Surgical Arteries / transplantation* Graft Occlusion, Vascular / pathology* Guanine / physiology* Humans Models, Biological Pulsatile Flow Regional Blood Flow Video Recording |
| Chemical | |
Reg. No./Substance:
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73-40-5/Guanine |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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