One-Dimensional Computer Analysis of Oscillatory Flow in Rigid Tubes

[+] Author and Article Information
F. M. Donovan

Mechanical Engineering Department, The University of South Alabama, Mobile, AL 36688

Bruce C. Taylor, M. C. Su

Biomedical Engineering Department, The University of Akron, Akron, OH 44325

J Biomech Eng 113(4), 476-484 (Nov 01, 1991) (9 pages) doi:10.1115/1.2895429 History: Received September 17, 1990; Revised April 10, 1991; Online March 17, 2008


The dynamic characteristics of catheter-transducer systems using rigid tubes with compliance lumped in the transducer and oscillatory flow of fluid in rigid tubes were analyzed. A digital computer model based on one dimensional laminar oscillatory flow was developed and verified by exact solution of the Navier-Stokes Equation. Experimental results indicated that the damping ratio and resistance is much higher at higher frequencies of oscillation than predicted by the one dimensional model. An empirical correction factor was developed and incorporated into the computer model to correct the model to the experimental data. Amplitude of oscillation was found to have no effect on damping ratio so it was concluded that the increased damping ratio and resistance at higher frequencies was not due to turbulence but to two dimensional flow effects. Graphs and equations were developed to calculate damping ratio and undamped natural frequency of a catheter-transducer system from system parameters. Graphs and equations were also developed to calculate resistance and inertance for oscillatory flow in rigid tubes from system parameters and frequency of oscillation.

Copyright © 1991 by The American Society of Mechanical Engineers
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