Clinical investigations of the effects of dehydration on vocal fold tissue rheology have suggested that vocal fold hydration level has a significant influence on vocal fold vibration, voice quality and vocal health in general. Most previous investigations of the influence of hydration on mechanical properties have been qualitative. Few have used a quantative approach to analyze and estimate water transport from the human larynx. A numerical study of airflow and water transport was thus conducted. The numerical methods were verified by performing experiments and numerical simulations of water transport in a rectangular channel. Two-dimensional and three-dimensional computer models of the human larynx were created to simulate and analyze airflow through the larynx during inbreathing, and estimate water transport due to convection. The results were found to be consistent with available data in the literature, and experimental data. Parameters such as the inlet pressure, the glottal angle and the orifice width were varied and their influence on water transport was quantified. The results may be useful in assessments of the role of water convection on vocal fold dehydration. / Des études récentes des effets de la deshydratation sur les propriétés mécaniques des cordes vocals indiquent une forte influence sur les vibrations des tissus, l'hygiène vocale, et la santé en général. La plupart des etudes publiées sur ce sujet sont qualitatives. Le but de ce travail de recherche fut d'évaluer de façon quantitative la mas se d'eau transportée par convection dans l'écoulement d'air passant par la glotte durant la production vocale. Des methods de simulation numérique ont été utilisées, validées par des mesures expérimentales pour un cas simple d'écoulement en conduite rectangulaire. Les modèles numériques bi- et tri-dimensionels furent alors appliqués à des cas d'orifices avec des géometries similaires à la glotte. Les résultats semblent corroborer les données éxistantes publiées à ce jour. L'influence de parameters tels que la pression pulmonaire, la géométrie de l'orifice, et sa largeur fut étudiée. Ces resultats permettent une meilleure evaluation de la quantitée d'eau perdue par les cordes vocales pendant le discourse du à la convection massique.
| Identifer | oai:union.ndltd.org:LACETR/oai:collectionscanada.gc.ca:QMM.66984 |
| Date | January 2009 |
| Creators | Wang, Shuangdong |
| Contributors | Luc Mongeau (Internal/Supervisor) |
| Publisher | McGill University |
| Source Sets | Library and Archives Canada ETDs Repository / Centre d'archives des thèses électroniques de Bibliothèque et Archives Canada |
| Language | English |
| Detected Language | French |
| Type | Electronic Thesis or Dissertation |
| Format | application/pdf |
| Coverage | Master of Engineering (Department of Mechanical Engineering) |
| Rights | All items in eScholarship@McGill are protected by copyright with all rights reserved unless otherwise indicated. |
| Relation | Electronically-submitted theses. |
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