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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An Experimental and Numerical Study on Deposition of Bioaerosols in a Scaled Chamber
TL;DR: In this article, an experimental facility designed and built with the objective of understanding the deposition of bioaerosols in indoor environments was used to study the effect of air flow rate and mixing conditions on the bio-aerosol dispersion and deposition.
Journal ArticleDOI
Numerical Investigation of the Effects of Nanoparticle Diameter on Velocity Field and Nanoparticle Distribution of Nanofluid Using Lagrangian-Eulerian Approach
TL;DR: In this paper, the effects of nanoparticle diameter on the concentration distribution and velocity of nanoparticles in nanofluid are examined using Lagrangian-Eulerian, and the effect of the change of Brownian and thermophoretic forces with diameter on nanoparticles and fluid velocity as well as nanoparticles distribution are studied.
Journal ArticleDOI
Graphite dust deposition on HTGR steam generator: Effects of particle-wall and particle-vortex interactions
TL;DR: In this article, the authors combined with computational fluid dynamics (CFD) simulation and discrete phase method, the deposition of graphite dust on the upper 5 layers of SG tubes is studied.
Journal ArticleDOI
CFD model development and validation of a thermonebulisation fungicide fogging system for postharvest storage of fruit
Mulugeta Admasu Delele,Mulugeta Admasu Delele,B. Vorstermans,P. Creemers,Alemayehu Ambaw Tsige,Engelbert Tijskens,Ann Schenk,Umezuruike Linus Opara,Bart Nicolai,Pieter Verboven +9 more
TL;DR: In this paper, a computational fluid dynamics (CFD) model was developed and validated to investigate the effectiveness of postharvest storage fungicide fogging systems, a discrete element (DE) method was applied to generate a random stacking of spherical fruits in a typical bin.
Flow and particle deposition patterns in a realistic human double bifurcation airway model
TL;DR: In this paper, the effects of inhalation conditions on velocity profiles and particle deposition were studied, and the results indicated that the local deposition efficiencies in the first bifurcation increased with a rise in the Stokes number within St range from 0.0004 to 0.7.
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.
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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.