Numerical simulation of aerosol particle transport by oscillating flow in respiratory airways

1992 ◽  
Vol 20 (6) ◽  
pp. 573-581 ◽  
Author(s):  
James K. Briant ◽  
Duane D. Frank ◽  
Anthony C. James ◽  
L. Loren Eyler
Keyword(s):  
Numerical Simulation ◽  
Aerosol Particle ◽  
Particle Transport ◽  
Oscillating Flow

scholarly journals Numerical Simulation of the Aerosol Particle Motion in Granular Filters with Solid and Porous Granules

Processes ◽  
2021 ◽  
Vol 9 (2) ◽  
pp. 268
Author(s):  
Olga V. Soloveva ◽  
Sergei A. Solovev ◽  
Ruzil R. Yafizov
Keyword(s):  
Numerical Simulation ◽  
Aerosol Particle ◽  
Particle Deposition ◽  
Particle Diameter ◽  
Deposition Efficiency ◽  
Hydrodynamic Resistance ◽  
Hydrodynamic Properties ◽  
Granular Filters ◽  
Limiting Value ◽  
Good Agreement

In this work, a study was carried out to compare the filtering and hydrodynamic properties of granular filters with solid spherical granules and spherical granules with modifications in the form of micropores. We used the discrete element method (DEM) to construct the geometry of the filters. Models of granular filters with spherical granules with diameters of 3, 4, and 5 mm, and with porosity values of 0.439, 0.466, and 0.477, respectively, were created. The results of the numerical simulation are in good agreement with the experimental data of other authors. We created models of granular filters containing micropores with different porosity values (0.158–0.366) in order to study the micropores’ effect on the aerosol motion. The study showed that micropores contribute to a decrease in hydrodynamic resistance and an increase in particle deposition efficiency. There is also a maximum limiting value of the granule microporosity for a given aerosol particle diameter when a further increase in microporosity leads to a decrease in the deposition efficiency.

Effects of Bounce on Particle Transport, Deposition and Removal in Turbulent Channel Flow

2002 ◽  
Author(s):  
Ali Reza Mazaheri ◽  
Goodarz Ahmadi ◽  
Haifeng Zhang
Keyword(s):  
Numerical Simulation ◽  
Channel Flow ◽  
Particle Transport ◽  
Fluid Velocity ◽  
Turbulent Channel Flow ◽  
Equation Of Motion ◽  
Particle Bounce ◽  
Pseudo Spectral Method ◽  
Pseudo Spectral ◽  
Fluid Velocity Field

Effects of bounce on particle transport, deposition and removal in turbulent channel flow are studied. The pseudo-spectral method is used to generate the instantaneous turbulent fluid velocity field by Direct Numerical Simulation (DNS) procedure. The particle equation of motion includes all the relevant hydrodynamic forces. In addition, simulation accounts for particle adhesion, resuspension and rebound processes. For particle bounce from the surface, the critical velocity is evaluated and is used in the analysis. Effects of bounce during particle-wall collisions on the deposition rate are also studied.

Numerical Simulation of the Nozzle with Self-Oscillating Flow Using the VOF Model

2012 ◽  
Vol 479-481 ◽  
pp. 2380-2382
Author(s):  
Zheng Fu Zhang ◽  
Jun Wei Wang ◽  
Feng Bao
Keyword(s):  
Numerical Simulation ◽  
Cfd Simulation ◽  
Immiscible Fluids ◽  
Oscillating Flow ◽  
Surface Tracking ◽  
Shape Models ◽  
Vof Model ◽  
Eulerian Mesh ◽  
Simulation Results ◽  
Fixed Period

The jet water shape of the nozzle will become a self-oscillating shape, if the triangle and U shape models are made into the normal nozzle. Using the VOF model , the jet shape of the nozzle will be simulated through a commercial CFD software 'FLUENT'. The VOF model (Volume of Fluid) is a surface-tracking technique applied to a fixed Eulerian mesh. It is designed for two or more immiscible fluids where the position of the interface between the fluids is of interest. The CFD simulation results shows that the jet shape of the nozzle is oscillate in a fixed period.

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