Numerical simulations investigating the regional and overall deposition efficiency of the human nasal cavity.
Numerical simulations have been carried out on a model of the right passageway of an anonymous, adult male's nasal cavity, constructed from magnetic resonance imagery (MRI) scans. Steady, laminar, inspiratory flow was assumed to simulate inhalation. Analysis shows smoothly varying streamlines with a peak in velocity magnitude occurring in the nasal valves and a peak in vorticity magnitude immediately posterior. Dilute, uniform concentrations of inertial (1 microm < or = d(ae) < or = 10 microm) particles were released at the nostril and tracked via a Lagrangian tracking algorithm. Deposition efficiency is shown to increase with particle size and flow rate. Preferential deposition is seen in the anterior third of the nasal cavity for large Stokes number particles. An empirical expression for particle deposition is proposed that incorporates particle size, flow rate, and nose anatomy.
Shanley
Kevin T
KT
Department of Mechanical and Aeronautical Engineering Clarkson University, Potsdam, New York 13699-5700, USA.
Zamankhan
Parsa
P
Ahmadi
Goodarz
G
Hopke
Philip K
PK
Cheng
Yung-Sung
YS
D000280:Administration, Inhalation; D000328:Adult; D003198:Computer Simulation; D006801:Humans; D008297:Male; D008953:Models, Anatomic; D009296:Nasal Cavity / Q000033:anatomy & histology* / Q000378:metabolism*; D010316:Particle Size; D012123:Pulmonary Ventilation / Q000502:physiology