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VISCOUS FLOW FEATURES IN SCALED-UP PHYSICAL MODELS OF NORMAL AND PATHOLOGICAL VOCAL PHONATION

Byron D. Erath
School of Mechanical Engineering, Purdue University 585 Purdue Mall, West Lafayette, IN, 47907; Department of Mechanical and Aerospace Engineering The George Washington University 205 Staughton Hall, 707 22nd St. NW, Washington, DC

Michael W. Plesniak
Maurice J. Zucrow Laboratories (formerly Thermal Sciences and Propulsion Center), School of Mechanical Engineering, Purdue University, West Lafayette, Indiana, USA; Department of Mechanical and Aerospace Engineering The George Washington University

Resumo

Unilateral vocal fold paralysis results when the recurrent laryngeal nerve which innervates the muscles of the vocal folds becomes damaged. The loss of muscle and tension control to the damaged vocal fold renders it ineffectual. The mucosal wave disappears during phonation, and the fold becomes largely immobile. The influence of unilateral vocal fold paralysis on the viscous flow development within the glottis during phonation was investigated. Driven, scaled-up vocal fold models were employed to replicate both normal and pathological patterns of speech. Spatial and temporal velocity fields were captured using Particle Image Velocimetry, and laser Doppler velocimetry. Flow parameters were scaled to match the physiological values in human speech. Loss of motion in one vocal fold resulted in a suppression of typical glottal flow fields, including decreased variability in the flow separation point throughout the glottal cycle, as well as a decrease in the flow vorticity.