Journal ArticleDOI
Dispersion and Deposition of Spherical Particles from Point Sources in a Turbulent Channel Flow
Amy Li,Goodarz Ahmadi +1 more
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TLDR
In this paper, the dispersion and deposition of aerosol particles from a point source in a turbulent channel flow are studied, and an empirical mean velocity profile and experimental data for turbulent intensities are used in the analysis.Abstract:
The dispersion and deposition of particles from a point source in a turbulent channel flow are studied. An empirical mean velocity profile and the experimental data for turbulent intensities are used in the analysis. The instantaneous turbulence fluctuation is simulated as a continuous Gaussian random field, and an ensemble of particle trajectories is generated and statistically analyzed. A series of digital simulations for dispersion and deposition of aerosol particles of various sizes from point sources at different positions from the wall is performed. Effects of Brownian diffusion on particle dispersion are studied. The effects of variation in particle density and particle-surface interaction are also discussed.read more
Citations
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Journal ArticleDOI
Numerical Investigation of Ultrafine Aerosol Deposition inside a Needle Charger without Applied Voltage
TL;DR: In this article , the particle deposition in a needle charger without applied voltage was studied by simulating the flow field and the particle trajectory, and the results demonstrated that reducing the flow rate increases particle deposition of the needle charger.
Proceedings ArticleDOI
Simulação numérica de escoamento particulado aplicado ao preenchimento de canal fraturado
TL;DR: In this article, a numerica do preenchimento de a canal vertical with fratura transversal and apresentada is presented, e o result mostram que a influencia da quantidade de particulas injetadas exerce maior influencia sobre o tempo necessario for realizar o preenchantimento.
Dissertation
Parallel Lagrangian particle transport : application to respiratory system airways
TL;DR: This thesis prioritizes numerical modeling, wide usability, performance, parallelization, and the study of the physics that affects particle transport for any engineering application that involves particle transport simulation.
Journal ArticleDOI
NanoSpotTM collector for aerosol sample collection for direct microscopy and spectroscopy analysis
TL;DR: In this paper , a water-based, laminar-flow, condensation growth technique is used for collecting airborne particles on a microscopy substrate for direct electron and optical microscopy and laser spectroscopy analysis.
Evaluation of human exposure to indoor airborne pollutants : transport and fate of particulate and gaseous pollutants
TL;DR: In this paper, the authors investigated the effect of breathing in the vicinity of a human body, and the effects of respiration on breathing concentration of particulate and gaseous pollutants, and inhalation exposure in relation to source position and overall airflow patterns.
References
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Journal ArticleDOI
On the Theory of the Brownian Motion
TL;DR: In this paper, the mean values of all the powers of the velocity $u$ and the displacement $s$ of a free particle in Brownian motion are calculated and the exact expressions for the square of the deviation of a harmonically bound particle in the Fokker-Planck partial differential equation as a function of the time and the initial deviation are obtained.
Journal ArticleDOI
Equation of motion for a small rigid sphere in a nonuniform flow
Martin R. Maxey,James J. Riley +1 more
TL;DR: In this paper, the forces on a small rigid sphere in a nonuniform flow are considered from first prinicples in order to resolve the errors in Tchen's equation and the subsequent modified versions that have since appeared.
Journal ArticleDOI
The lift on a small sphere in a slow shear flow
TL;DR: In this article, it was shown that a sphere moving through a very viscous liquid with velocity V relative to a uniform simple shear, the translation velocity being parallel to the streamlines and measured relative to streamline through the centre, experiences a lift force 81·2μVa2k½/v½ + smaller terms perpendicular to the flow direction, which acts to deflect the particle towards the streamline moving in the direction opposite to V.