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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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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Performance optimization of water-Al2O3 nanofluid flow and heat transfer in trapezoidal cooling microchannel using constructal theory and two phase Eulerian-Lagrangian approach
Erfan Khodabandeh,Abbas Abbassi +1 more
TL;DR: In this paper, the performance of micro heat sink with nanofluid of water-Al2O3 of 1% and the optimum geometry dimensions are evaluated in the trapezoidal microchannel by using constructal theory and the two-phase Eulerian-Lagrangian method.
Journal ArticleDOI
Distribution characteristics of exhaust gases and soot particles in a wall-flow ceramics filter
TL;DR: In this paper, a Lagranian continuous random walk (CRW) model is developed to simulate soot particulate motion, which considers a succession of uncorrelated random forcing and drift corrections.
Journal ArticleDOI
Numerical comparison of removal and deposition for fully-distributed particles in central- and split-type air-conditioning rooms
TL;DR: In this paper, the removal and deposition of fully-distributed particles in a three-dimensional room equipped by two different air-conditioning systems, i.e., central-type air conditioner and split-type conditioner, were investigated numerically by an Euler-Lagrangian approach.
Journal ArticleDOI
Modelling and measurements of the characteristics of ash deposition and distribution in a HRSG of wastewater incineration plant
Lin Mu,Liang Zhao,Hongchao Yin +2 more
TL;DR: Wang et al. as mentioned in this paper used a numerical deposition model coupled with a gas-solid two phase turbulent flow model to predict ash particle sticking and rebounding in the thermal boundary layer, as well as shedding of deposited particles from tube surfaces.
Journal ArticleDOI
Numerical Study of the Effect of Ventilation Pattern on Coarse, Fine, and Very Fine Particulate Matter Removal in Partitioned Indoor Environment
TL;DR: An indoor size-dependent particulate matter (PM) transport approach is developed to investigate coarse PM, fine PM, and very fine PM (PM1) removal behaviors in a ventilated partitioned indoor environment and shows that for all the of the three ventilation patterns, PM2.5 and PM1 are much more difficult to remove than PM10.
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.
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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.