Journal
APPLIED SCIENCES-BASEL
Volume 11, Issue 10, Pages -Publisher
MDPI
DOI: 10.3390/app11104535
Keywords
vertical glottal duct length; convergent glottal angle; intraglottal pressure; vocal fold geometry
Categories
Funding
- National Natural Science Foundation of China (NSFC) [11974289]
- Key Research and Development Program of Shaanxi Province, China [2019SF-103]
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The study found that in the convergent glottis, a longer vertical glottal duct length increases intraglottal pressures, decreases glottal entrance loss coefficient, and affects intraglottal flow velocity and wall shear stress gradient, playing an important role in phonation.
In a previous study, the vertical glottal duct length was examined for its influence on intraglottal pressures and other aerodynamic parameters in the uniform glottis [J Voice 32, 8-22 (2018)]. This study extends that work for convergent glottal angles, the shape of the glottis during the glottal opening phase of vocal fold vibration. The computational fluid dynamics code ANSYS Fluent 6.3 was used to obtain the pressure distributions and other aerodynamic parameters for laminar, incompressible, two-dimensional flow in a static vocal fold model. Four typical vertical glottal duct lengths (0.108, 0.308, 0.608, 0.908 cm) were selected for three minimal diameters (0.01, 0.04, 0.16 cm), three transglottal pressures (500, 1000, 1500 Pa), and three convergent glottal angles (-5 degrees, -10 degrees, -20 degrees). The results suggest that a longer vertical glottal duct length increases the intraglottal pressures, decreases the glottal entrance loss coefficient, increases the transglottal pressure coefficient, causes a lower gradient of both the intraglottal flow velocity and the wall shear stress along the glottal wall-especially for low flows and small glottal minimal diameters-and has little effect on the exit pressure coefficient and volume flow. The vertical glottal duct length in the convergent glottis has important effects on phonation and should be well specified when building computational and physical models of the vocal folds.
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