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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Experimental and numerical investigation of turbulent nanofluid flow in helically coiled tubes under constant wall heat flux using Eulerian–Lagrangian approach
TL;DR: In this article, a two-phase Eulerian-Lagrangian approach was used to calculate the pressure drop and convective heat transfer behavior of water and water-silver nanofluid in helically coiled tubes.
Journal ArticleDOI
DEM simulation of aggregation of suspended nanoparticles
TL;DR: In this article, a DEM-based model was developed and examined for simulation of aggregation in suspensions of α-alumina nanoparticles, where the non-contact surface force and the contact force were taken into account using the well-known Derjaguin-Landau-Verway-Overbeek (DLVO) theory and the soft-sphere model, respectively.
Journal ArticleDOI
Regional aerosol deposition in the human airways: The SimInhale benchmark case and a critical assessment of in silico methods
Pantelis Koullapis,Stavros C. Kassinos,J. Muela,Carlos David Pérez-Segarra,Joaquim Rigola,Oriol Lehmkuhl,Yan Cui,Martin Sommerfeld,Jakub Elcner,Miroslav Jicha,Igor Saveljic,Nenad Filipovic,Frantisek Lizal,Laura Nicolaou +13 more
TL;DR: In vitro deposition measurements have been conducted in a human‐based model of the upper airways, and several groups within MP1404 SimInhale have computed the same case using a variety of simulation and discretization approaches, and a critical discussion of the performance of the various simulation methods is provided.
Journal ArticleDOI
Modeling particle-loaded single fiber efficiency and fiber drag using ANSYS–Fluent CFD code
S.A. Hosseini,H. Vahedi Tafreshi +1 more
TL;DR: In this paper, the authors present a methodology for simulating pressure drop and collection efficiency of a filter medium during instantaneous particle loading using the ANSYS-Fluent CFD code, enhanced with in-house subroutines.
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Numerical simulation of particle capture process of fibrous filters using Lattice Boltzmann two-phase flow model
TL;DR: In this article, a lattice Boltzmann model for two-phase flows is proposed to simulate the deposition of particulate matter on filter fibers in a laminar flow normal to their axes, and detailed information on the particle trajectories and the dendrite structures are obtained.
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.