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RESEARCH PAPERS

Measurement of Steady-Flow Instability and Turbulence Levels in Dacron Vascular Grafts

[+] Author and Article Information
D. G. Shombert

Division of Physical Sciences, Office of Science and Technology, Center For Devices and Radiological Health, Food and Drug Administration, Rockville, MD 20857

J Biomech Eng 114(4), 521-526 (Nov 01, 1992) (6 pages) doi:10.1115/1.2894105 History: Received October 27, 1991; Revised February 28, 1992; Online March 17, 2008

Abstract

Fluid dynamic properties of Dacron vascular grafts were studied under controlled steady-flow conditions over a Reynolds number range of 800 to 4500. Knitted and woven grafts having nominal diameters of 6 mm and 10 mm were studied. Thermal anemometry was used to measure centerline velocity at the downstream end of the graft; pressure drop across the graft was also measured. Transition from laminar flow to turbulent flow was observed, and turbulence intensity and turbulent stresses (Reynolds normal stresses) were measured in the turbulent regime. Knitted grafts were found to have greater pressure drop than the woven grafts, and one sample was found to have a critical Reynolds number (Rc ) of less than one-half the value of Rc for a smooth-walled tube.

Copyright © 1992 by The American Society of Mechanical Engineers
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