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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A Comparative Study on the Separation of Different‐Shape Particles Using a Mini‐Hydrocyclone
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Numerical simulation of airflow and particle distributions with floor circular swirl diffuser for underfloor air distribution system in an office environment.
TL;DR: The results showed that the circular swirl diffuser has better airflow and thermal conditions compared with the circular direct diffusers and it was also shown that the studied UFAD system provides good thermal comfort condition.
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Effects of non-newtonian properties of blood flow on magnetic nanoparticle targeted drug delivery
TL;DR: It is preferred in the simulation to model blood flow as a non-Newtonian fluid and uses one of Herschel- Bulkley or Power-law models, otherwise the simulation is far different from real phenomena.
Journal ArticleDOI
Submicron particle deposition in pulmonary alveoli during cyclic breathing
TL;DR: The pulmonary alveoli of a healthy human are idealized by a three-dimensional honeycomb-like con guration and a fluid-structure interaction analysis is performed, showing high depositionency for submicron sizes in the alveolar region if these particles can reach the alVEolar region.
Journal ArticleDOI
A numerical study of the effects of ambient temperature and humidity on the particle growth and deposition in the human airway.
Chang Xu,Xin Zheng,Shifei Shen +2 more
TL;DR: In this paper, a numerical study was conducted on the effects of ambient temperature and humidity on the transportation of sodium chloride particles (100 nm-1 μm) in a human airway model ranging from the nasal cavity to bronchi.
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.