Velocity distributions in glottal models.
Velocity distributions within three models of the human larynx, namely, a rigid plexiglas model, an excised canine larynx, and a computational model are investigated with experimental and theoretical analyses. A plexiglas wind tunnel with interchangeable glottal constrictions was used as a two-dimensional steady-flow model to measure velocity and pressure for various glottal shapes. A canine excised larynx was used as a prototype pulsatile flow model to study pressure and velocity variations during phonation. Results of the plexiglas modelling indicated a parabolic laminar velocity profiles upstream of the glottal constriction and turbulent and asymmetric velocity profile downstream of the glottal constriction. The time-averaged velocities of the excised larynx had similarities with the plexiglas model results, and instabilities and asymmetries were also demonstrated by the computational method.
Alipour
F
F
Department of Speech Pathology and Audiology, Wendell Johnson Speech and Hearing Center, University of Iowa, Iowa City 52246-1012, USA.
Scherer
R
R
Knowles
J
J
D000818:Animals; D004285:Dogs; D006801:Humans; D007830:Larynx / Q000502:physiology*; D007831:Larynx, Artificial; D008953:Models, Anatomic; D012123:Pulmonary Ventilation / Q000502:physiology