Numerical analysis of stochastic dispersion of micro-particles in turbulent flows in a realistic model of human nasal/upper airway

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• 作者：Ebrahim Ghahramani ; Omid Abouali ; Homayoon Emdad ; Goodarz Ahmadi
• 关键词：Human upper airway ; Micro-particle deposition ; CRW ; Realistic model ; Biofluid mechanics
• 刊名：Journal of Aerosol Science
• 出版年：January, 2014
• 年：2014
• 卷：67
• 期：Complete
• 页码：188-206
• 全文大小：5276 K

文摘

Turbulent flow field and particle deposition in a realistic model of human upper airway system including: nasal cavity, nasopharynx, oropharynx, larynx and trachea were analyzed numerically. The Lagrangian approach was used to find the trajectories of micron-size particles for the breathing rates of 30, 45 and 60 l/min. The continuous phase flow was evaluated using a RANS (Reynolds Average Navier-Stokes) turbulence model and the effect of turbulent fluctuations on particle trajectories was modeled using a continuous random walk (CRW) stochastic model, which is based on the normalized Langevin equation. The total and regional deposition fractions of micro-particles were evaluated and the effect of turbulent fluctuations on the particle deposition rate was investigated.