Multicolor particle shadow velocimetry and accelerometry for measurements in a human airway model
Open Access
- Author:
- Mcphail, Michael Jesse
- Graduate Program:
- Bioengineering
- Degree:
- Master of Science
- Document Type:
- Master Thesis
- Date of Defense:
- None
- Committee Members:
- Michael H Krane, Thesis Advisor/Co-Advisor
Arnold Anthony Fontaine, Thesis Advisor/Co-Advisor
Keefe B Manning, Thesis Advisor/Co-Advisor
William O Hancock, Thesis Advisor/Co-Advisor
Cheng Dong, Thesis Advisor/Co-Advisor - Keywords:
- Phonation
Voice production
Human airway model
Particle shadow velocimetry
Optical flow measurement - Abstract:
- This thesis presents the further development of an optical flow measurement technique towards measurements in a model of the human airway. Multicolor particle shadow velocity and accelerometery have the potential for low cost, high dynamic range fluid velocity and acceleration field measurements. Such measurements in a human airway model can address the precise nature of glottal airflow and improve the understanding of the process of phonation. Improved understanding of the coupled aeroelastic-aeroacoustic processes in phonation will lead to better diagnostic techniques, equipment, and procedures for phonatory disorders. A validation experiment for particle shadow velocimetry and it's multicolor extension were performed in a previously characterized turbulent pipe flow. Correction methods were evaluated for issues arising due to multicolor illumination and color imaging. Velocity statistics from single color and corrected multicolor particle shadow velocimetry compared well with previously published laser Doppler velocimetry measurements taken in the same facility. The first extension of particle shadow velocimetry to acceleration field measurements is shown in a case of unsteady solid body rotation. A pendulous disk fitted with an accelerometer provided a validation case for unsteady acceleration field measurements. Particle shadow accelerometry and accelerometer measurements compared well, and were within measurement uncertainty. Multicolor particle shadow accelerometry measurements were also conducted in a turbulent pipe flow. Measured unsteady acceleration fields were similar to those predicted by the frozen field advection of vortical structures. Finally, preliminary measurements taken in a life-size model of a human airway are presented. Velocity measurements were conducted with both rigid and compliant models of the vocal folds. Volume flow rates were estimated and the glottal jet was visualized. %Multicolor particle shadow velocimetry and accelerometer were shown to be low cost, high dynamic range fluid field measurement too