|
|
|
| Numerical Simulation on Characteristics of Airflow Movement in Human Upper Respiratory Tract under Fluid-Solid Coupling |
| Institute of Medical Equipment, Academy of Military Medicine Sciences; National Biological Protection Engineering Center, Tianjin 300161, China |
|
|
|
Abstract Research the effect of fluidsolid coupling on human upper respiratory tract can lead to deep understanding of the characteristics of the airflow in human upper respiratory tract and plays a very important role in analyzing the diffusion, transition and deposition patterns of aerosol in human upper respiratory tract. The numerical simulation of fluid-solid interaction mechanics was applied to simulate airflow movement in human upper respiratory tract model in the conditions of low intensive respiratory patterns (respiratory flow is 30 L/min), the shape variation and shear stress distribution in human upper respiratory tract was discussed, and the airflow movement in human upper respiratory tract was analyzed. Results showed that in the low intensive respiratory patterns, human upper respiratory tract moves backward, the maximum displacement of the tertiary bronchus was 4.99 mm, the anterior wall was stretched, and the posterior wall was compressed. The wall shearing stress in the mouth-throat model was larger than that in the trachea-triple bifurcation, and the maximum shearing stress was 30.34 Pa. The maximum of airflow velocity reached maximum at 7.85 m/s in the glottis. The phenomenon of airflow separation appeared near the outer wall of the pharynx and the trachea, and the high velocity zone was created near the inner wall of the trachea. The airflow split at the divider and high velocity zone was generated near the inner wall of the trachea.
|
|
|
|
|
|
|
|
|
