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Characterization of the laryngeal jet using phase Doppler interferometry
1Spray Systems Technology Center, Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, USA. Corcoran+@andrew.cmu.edu
Summary
The laryngeal jet creates reverse airflow and turbulence in the trachea, influencing aerosol deposition. These effects persist downstream, impacting drug delivery in the lungs.
Area of Science:
- Fluid dynamics
- Respiratory physiology
- Aerosol science
Background:
- Understanding airflow in the trachea is crucial for aerosol deposition.
- The laryngeal jet's impact on inhalation dynamics requires further investigation.
Purpose of the Study:
- To characterize laryngeal jet effects on tracheal airflow.
- To understand aerosol deposition in the larynx and trachea.
Main Methods:
- Phase Doppler Interferometry used in a cadaver-based larynx-trachea model.
- Flow characterized at three Reynolds numbers (1250, 1700, 2800).
- Measurements taken at six downstream planes.
Main Results:
- Significant reverse flows observed in the anterior trachea within one diameter downstream.
- High axial turbulence intensity noted near anterior/left tracheal walls.
- Turbulence persisted downstream, with higher levels at lower Reynolds numbers.
Conclusions:
- Laryngeal jet induces reverse flow and turbulence, promoting aerosol deposition.
- Turbulence extends into the bronchial tree, affecting deposition.
- Flow complexity influences deposition patterns.