An Experimental Study of Pulsatile Flow in Canine Larynges

[+] Author and Article Information
F. Alipour

Department of Speech Pathology and Audiology, The University of Iowa, 334 WJSHC, Iowa City, Iowa 52242-1012

R. C. Scherer

Wilbur James Gould Voice Research Center, The Denver Center for the Performing Arts, Denver, CO 80204

V. C. Patel

Department of Mechanical Engineering & Iowa Institute of Hydraulic Research, The University of Iowa Iowa City, Iowa

J. Fluids Eng 117(4), 577-581 (Dec 01, 1995) (5 pages) doi:10.1115/1.2817304 History: Received September 22, 1994; Revised April 26, 1995; Online December 04, 2007


Pulsatile flow in an excised canine larynx was investigated with simultaneous recordings of air velocity, subglottal pressure, volume flow rate, and the signal from an electro-glottograph (EGG) for various conditions of phonation. Canine larynges were mounted on a pseudotrachea and sustained oscillations were established and maintained with sutures attached to cartilages to mimic the function of laryngeal muscles. The pitch and amplitude of the oscillations were controlled by varying the airflow, and by adjusting glottal adduction and vocal-fold elongation. Measurements with hot-wire probes suggest that subglottal inlet flow to the larynx is pulsatile but mostly laminar, while the exiting jet is non-uniform and turbulent. In the typical ranges of flow rate, subglottal pressure, and oscillation frequencies, the Reynolds number based on the mean glottal velocity and glottal hydraulic diameter varied between 1600 to 7000, the Strouhal number based on the same parameters varied between 0.002 and 0.032, and the Womersley number ranged from 2.6 to 15.9. These results help define the conditions required for computational models of laryngeal flow.

Copyright © 1995 by The American Society of Mechanical Engineers
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