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Title: Aerodynamics and aerosol transportation in human airways
Keywords: Human airways, Bifurcation angle, Recirculation, Double vortices, Inlet release profiles, Particle deposition
Issue Date: 10-May-2007
Citation: KWEK JIN WANG (2007-05-10). Aerodynamics and aerosol transportation in human airways. ScholarBank@NUS Repository.
Abstract: A numerical study of the airflow and particle deposition in simulated human airways from generations G3 to G5 using Weibela??s Model A was done. The bifurcation angle between one branch of G4 and G3 was varied from 20, 30 to 40 degrees. Inspiratory, laminar and incompressible flow was assumed at the inlet. Using FLUENT 6.1, various inlet Reynolds numbers were chosen to represent resting, light and moderate activities respectively. Recirculation was found to occur earlier in G4 at lower Re number for configurations with larger bifurcation angle. The intensities of the primary double vortices in G4 increased with bifurcation angle. Weak secondary double vortices were found in G5 at various Re number for different bifurcation angles. Particle deposition analyses were carried out for various particle diameters (1, 3 and 5 um) and inlet release profiles (monodispersed parabolic and homogeneous, and polydispersed parabolic). As Stokes number increased, significant difference could be found between configurations with bifurcation angles of 20 and 30 degrees. Polydispersed parabolic release profile gave the highest deposition efficiency (DE) at the highest Stokes number while monodispersed homogeneous release profile gave the lowest DE.
Appears in Collections:Master's Theses (Open)

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