Three-dimensional laryngeal flow fields induced by a model vocal fold polyp

Erath, Byron D.; Plesniak, Michael W.

doi:10.1016/j.ijheatfluidflow.2012.03.006

Cited by 15 publications

(7 citation statements)

References 32 publications

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“…In reality, the slope of the trend line is expected to vary for different voice registers. The smallest slope is expected for the high-pitched chest register, It is reported in scientific literature that the manifestation of vocal fold polyps will lead to disruption in the voice in the form of hoarseness [29], breathiness, and roughness [11]. The results of this numerical experiment support these claims by quantifying the decrease in pitch-intensity dependence.…”

Section: Effects Of Aspect Ratio Changessupporting

confidence: 70%

“…The added mass and stiffness of a polyp alters the propagation of the mucosal wave across the vocal fold surface, and protrudes into the glottis, subsequently altering the aerodynamics within the larynx [11]. These disruptions result in symptoms of dysphonia (difficulty in producing speech), such as hoarseness [29], vocal fatigue, breathiness, and rough vocal quality [11].…”

Section: Vocal Fold Polypsmentioning

confidence: 99%

“…1. Sessile: An exophytic (outward growing) protrusion [27, p. 24] with a balloon-like appearance [29].…”

Section: Vocal Fold Polypsmentioning

confidence: 99%

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Numerical Investigations of Pathological Phonation Resulting From a Unilateral Sessile Polyp

Greiss¹

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The voice, generated via the modulation of airflow by the vocal folds in the larynx, is studied computationally to improve treatment of voice disorders. A model of a vocal fold with a polyp is developed, and implemented in-house. Structural vibration of the model is computed in the time and frequency domain with the finite element method.Aerodynamic loading is computed with the Bernoulli equation, which is corrected for viscous and unsteady effects. A polyp's mass is the most influential parameter, followed by stiffness and position. Natural frequencies are decreased by increasing mass, and increased by increasing stiffness. Damping due to the polyp's mass is mitigated near fixed walls. Polyp mass distribution is most influential on vibration when spread into the glottis. Pitch-intensity dependence decreases with increasing polyp mass. The polyp disrupts vibration of the vocal fold pair by decreasing the cross-sectional area of the flow, and vibrating out of phase.ii To mom. Thank you for teaching me how to write.

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Section: Effects Of Aspect Ratio Changessupporting

confidence: 70%

Section: Vocal Fold Polypsmentioning

confidence: 99%

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Numerical Investigations of Pathological Phonation Resulting From a Unilateral Sessile Polyp

Greiss¹

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“…Data were acquired in the traverse plane 7.5 mm downstream of the polyp using phase-averaged particle image velocimetry 14 . As the vocal folds begin to open, a convergent channel is formed and a favorable pressure gradient is developed.…”

Section: Representative Resultsmentioning

confidence: 99%

“…These abnormalities can affect a patient's ability to communicate 13 . Nevertheless, only recently has the disruption of the flow field due to a geometric protuberance such as a polyp been considered 14 . That study showed that the "normal" fluid-structure energy-exchange process of speech was drastically altered, and that the modification of the flow field was the most likely reason for the severe degradation of vocal quality in patients with polyps and nodules.…”

Section: Introductionmentioning

confidence: 99%

Investigating the Three-dimensional Flow Separation Induced by a Model Vocal Fold Polyp

Stewart

Erath

Plesniak

2014

JoVE

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The fluid-structure energy exchange process for normal speech has been studied extensively, but it is not well understood for pathological conditions. Polyps and nodules, which are geometric abnormalities that form on the medial surface of the vocal folds, can disrupt vocal fold dynamics and thus can have devastating consequences on a patient's ability to communicate. Our laboratory has reported particle image velocimetry (PIV) measurements, within an investigation of a model polyp located on the medial surface of an in vitro driven vocal fold model, which show that such a geometric abnormality considerably disrupts the glottal jet behavior. This flow field adjustment is a likely reason for the severe degradation of the vocal quality in patients with polyps. A more complete understanding of the formation and propagation of vortical structures from a geometric protuberance, such as a vocal fold polyp, and the resulting influence on the aerodynamic loadings that drive the vocal fold dynamics, is necessary for advancing the treatment of this pathological condition. The present investigation concerns the threedimensional flow separation induced by a wall-mounted prolate hemispheroid with a 2:1 aspect ratio in cross flow, i.e. a model vocal fold polyp, using an oil-film visualization technique. Unsteady, three-dimensional flow separation and its impact of the wall pressure loading are examined using skin friction line visualization and wall pressure measurements. Video LinkThe video component of this article can be found at

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Three-dimensional flow separation over a surface-mounted hemisphere in pulsatile flow

Carr

Plesniak

2015

Exp Fluids

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Three-dimensional laryngeal flow fields induced by a model vocal fold polyp

Cited by 15 publications

References 32 publications

Numerical Investigations of Pathological Phonation Resulting From a Unilateral Sessile Polyp

Numerical Investigations of Pathological Phonation Resulting From a Unilateral Sessile Polyp

Investigating the Three-dimensional Flow Separation Induced by a Model Vocal Fold Polyp

Three-dimensional flow separation over a surface-mounted hemisphere in pulsatile flow

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