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
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Dissertation
CFD modelling of pipe erosion under multiphase flow regimes.
TL;DR: In this paper, the effects of turbulence and erosion rate was calculated using the Oka et al. model for double bend geometries and a pseudo-single phase model was evaluated in order to reduce the simulation resources to predict erosion in elbows mounted in series.
Journal ArticleDOI
Thermally “ Smart ” Characteristics of Nanofluids in Parallel Microchannel Systems to Mitigate Hot Spots in MEMS
TL;DR: In this paper, detailed simulations employing parallel microchannel systems with specialized manifold-channel configurations, i.e., U, I, and Z, have been performed, and the evidence of enhanced cooling of hot spots has been obtained from DPM analysis.
Journal ArticleDOI
Numerical simulations of the influence of Brownian and gravitational forces on the stability of CuO nanoparticles by the Eulerian–Lagrangian approach
TL;DR: In this article, the influence of Brownian and gravitational forces on the velocity and transport of induced CuO nanoparticles in oil was investigated and the concept of gravitational sedimentation and colloidal stability have been taken into consideration to give more physical insight about how these forces influence on the particle's displacement.
Dissertation
Locating hydrate deposition in multiphase compressed natural gas flow lines using computational fluid dynamics techniques
TL;DR: In this article, a comprehensive flow model capable of predicting the nucleation process, the growth rate, and the deposition potential of hydrate particles was developed for applications in two-phase fluid flow through flow lines with flow restriction geometries using Computational Fluid Dynamic (CFD) approach.
Book ChapterDOI
Thermal stimulation of targeted neural circuits via remotely controlled nano-transducers: A therapy for neurodegenerative disorders
Erfan Kosari,Kambiz Vafai +1 more
TL;DR: In this article, the authors provided a mathematical model that extensively elaborates the physical attributes such as the blood flow dynamics, nanoparticle interactions with capillary flow, heat transfer, and subsequent regulated neural signaling.
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.