The Effect of Constriction Size on the Pulsatile Flow in a Channel

[+] Author and Article Information
Moshe Rosenfeld, Shmuel Einav

Department of Fluid Mechanics and Heat Transfer and Department of Biomedical Engineering, Tel Aviv University, Tel Aviv 69978, Israel

J. Fluids Eng 117(4), 571-576 (Dec 01, 1995) (6 pages) doi:10.1115/1.2817303 History: Received April 26, 1994; Revised January 09, 1995; Online December 04, 2007


The effect of the constriction size on the pulsatile flow in a channel is studied by solving the time-dependent incompressible Navier-Stokes equations. A pulsating incoming flow is specified at the upstream boundary and the flow is investigated for several constriction sizes. Large flow structures are developed downstream of the constriction even for very small constriction size. The flow structures consist of several vortices that are created in each cycle and propagate downstream until they are washed away with the acceleration of the incoming flow. Additional vortices are created by a vortex multiplication process. The strength and total number of vortices generated in each cycle increase with the severity of the constriction. The maximal size of the vortices as well as their propagation speed are independent of the constriction size. These findings may be used for devising noninvasive methods for detecting the severity of stenoses in blood vessels and the potential damage to blood elements and thrombus formation caused by vortices.

Copyright © 1995 by The American Society of Mechanical Engineers
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