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- Title
TRANSITION AND LAMINAR FLOWS IN A REALISTIC GEOMETRY OF HUMAN UPPER AIRWAY.
- Authors
TABE, REZA; RAFEE, ROOHOLLAH; VALIPOUR, MOHAMMAD SADEGH; AHMADI, GOODARZ
- Abstract
In this study, a realistic respiratory airway model extending from oral to the end of the trachea including all the key details of the passage was produced. A series of CT scan images were used to generate the topological data of airway cross-sections that were used to generate the computational model, as well as the three-dimensional (3D) printed model of the passage for experimental study. The airflow velocity field and pressure drop in the airway for different breathing rates of 5, 7.5, 10, and 12.5 L/min were investigated numerically (by laminar and transition models) and experimentally. The velocity distributions, pressure variation, and streamlines along the oral–trachea airway model were studied. The maximum pressure drop was shown to occur in the narrowest part of the larynx region. It was also concluded that the laryngeal jet could significantly influence the airway flow patterns in the trachea. A comparison between the numerical results and experimental data showed that the transition k –kl– ω model can give better predictions of pressure losses, especially for flow rates higher than 10 L/min. The simulation results for the velocity profiles in the trachea were also compared with the available particle image velocimetry (PIV) data and earlier simulations. Despite inter-personal variability and difference in the flow regime, the qualitative agreement was found.
- Subjects
LAMINAR flow; AIRWAY (Anatomy); TRANSITION flow; PARTICLE image velocimetry; PRESSURE drop (Fluid dynamics); LARYNX; TRACHEA
- Publication
Journal of Mechanics in Medicine & Biology, 2022, Vol 22, Issue 1, p1
- ISSN
0219-5194
- Publication type
Article
- DOI
10.1142/S0219519421500706