Numerical simulation of nanoparticle synthesis in diffusion flame reactor

Yu, Mingzhou; Lin, Jianzhong; Chan, Tat Leung

doi:10.1016/j.powtec.2007.03.037

Cited by 96 publications

(79 citation statements)

References 27 publications

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“…The performance differential is more than a factor of 1000. This suggests that LES may be a practical tool for simulating the formation and growth of nanoparticles in turbulent flows (Weier and Garrick 2005;Yu et al 2008). What is lost in this type of simulation are small scale dynamics and features.…”

Section: Discussionmentioning

confidence: 99%

Large Eddy Simulation of Titanium Dioxide Nanoparticle Formation and Growth in Turbulent Jets

Loeffler

Das

Garrick

2011

Aerosol Science and Technology

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Large eddy simulations (LES) of titanium dioxide nanoparticles in three dimensional turbulent reacting planar jets are performed. The spatio-temporal evolution of the particle field is obtained by utilizing a nodal representation of the general dynamic equation. Gradient-diffusion, Smagorinsky-type subgrid-scale closures are employed to account for the unresolved stresses, fluid-scalar fluxes, and fluid-particle fluxes. The effect of the unresolved fluctuations on coagulation are neglected. Simulations are performed at two different precursor concentration levels. Comparison between results obtained via direct numerical simulation (DNS) and LES is performed to assess the performance of the closures. The LES performs fairly well in predicting the particle concentration as a function of size as well as the mean diameter. Additionally the polydispersity of the LES particle field is greater than that of the DNS. The results also suggest that at as the precursor concentration increases, neglect of the unresolved particle-particle interactions may act to increase the nanoparticle growth-rate.

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Section: Discussionmentioning

confidence: 99%

Large Eddy Simulation of Titanium Dioxide Nanoparticle Formation and Growth in Turbulent Jets

Loeffler

Das

Garrick

2011

Aerosol Science and Technology

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“…In this study, the theoretical model is based on the NavierStokes equation [12] of viscous fluid flow, combined with the Poisson-Nernst-Planck (PNP) ion transport equation.…”

Section: Governing Equations and Boundary Conditionsmentioning

confidence: 99%

“…Because of its small characteristic scale, most of the fluid flowing in the microchannels is laminar. Particles, droplets, or bubbles generally within the microchannels belong to the field of low Reynolds number flow theory [1][2][3]. Due to the sharp decrease of the volume to surface area ratio, the study found that the laws and phenomena of fluid movement at the microscale are different from the macro environment; the continuity equation in the three equations of hydrodynamics may no longer be suitable for use in microfluidics [4].…”

Section: Introductionmentioning

confidence: 99%

Design and Numerical Study of Micropump Based on Induced Electroosmotic Flow

Zhang

Jiang

Gao

et al. 2018

Journal of Nanotechnology

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Induced charge electroosmotic flow is a new electric driving mode. Based on the Navier-Stokes equations and the PoissonNernst-Planck (PNP) ion transport equations, the finite volume method is adopted to calculate the equations and boundary conditions of the induced charge electroosmotic flow. In this paper, the formula of the induced zeta potential of the polarized solid surface is proposed, and a UDF program suitable for the simulation of the induced charge electroosmotic is prepared according to this theory. At the same time, on the basis of this theory, a cross micropump driven by induced charge electroosmotic flow is designed, and the voltage, electric potential, charge density, and streamline of the induced electroosmotic micropump are obtained. Studies have shown that when the cross-shaped micropump is energized, in the center of the induction electrode near the formation of a dense electric double layer, there exist four symmetrical vortices at the four corners, and they push the solution towards both outlets; it can be found that the average velocity of the solution in the cross-flow microfluidic pump is nonlinear with the applied electric field, which maybe helpful for the practical application of induced electroosmotic flow in the field of micropump.

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“…Deposition of bioparticles and colloids onto the surface [1] is very important for many biochemical processes, such as assembly of carbon nanotubes [2,3] and trapping of nanoparticles and nanoparticle synthesis [4][5][6]. In these processes, particles' translation and rotation should be controlled accurately for counting and assembly of these particles [7,8].…”

Section: Introductionmentioning

confidence: 99%

Iterative Dipole Moment Method for the Dielectrophoretic Particle-Particle Interaction in a DC Electric Field

Zhang

2018

Journal of Nanotechnology

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Electric force is the most popular technique for bioparticle transportation and manipulation in microfluidic systems. In this paper, the iterative dipole moment (IDM) method was used to calculate the dielectrophoretic (DEP) forces of particle-particle interactions in a two-dimensional DC electric field, and the Lagrangian method was used to solve the transportation of particles. It was found that the DEP properties and whether the connection line between initial positions of particles perpendicular or parallel to the electric field greatly affect the chain patterns. In addition, the dependence of the DEP particle interaction upon the particle diameters, initial particle positions, and the DEP properties have been studied in detail. e conclusions are advantageous in elelctrokinetic microfluidic systems where it may be desirable to control, manipulate, and assemble bioparticles.

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Numerical simulation of nanoparticle synthesis in diffusion flame reactor

Cited by 96 publications

References 27 publications

Large Eddy Simulation of Titanium Dioxide Nanoparticle Formation and Growth in Turbulent Jets

Large Eddy Simulation of Titanium Dioxide Nanoparticle Formation and Growth in Turbulent Jets

Design and Numerical Study of Micropump Based on Induced Electroosmotic Flow

Iterative Dipole Moment Method for the Dielectrophoretic Particle-Particle Interaction in a DC Electric Field

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