Numerical simulation of silica nanoparticles production in an RF plasma reactor: Effect of quench

Mendoza-Gonzalez, Norma Y.; Goortani, Behnam Mostajeran; Proulx, Pierre

doi:10.1016/j.msec.2006.09.042

Cited by 31 publications

(20 citation statements)

References 7 publications

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“…Particularly, models based on aerosol dynamics have been used to study nanopowder production using several types of thermal plasmas, as described in an earlier review article [12]. By virtue of the efforts of several groups, the spatial distributions of nanopowder around plasmas or in downstream chambers have been clarified while taking account of both growth and transport under various conditions [22][23][24][25][26][27][28][29][30][31][32][33]. However, all those simulations were restricted in the steady fields of the nanopowder as well as the plasma flow.…”

Section: Thermal Plasma For Nanopowder Productionmentioning

confidence: 99%

Modeling and simulation of a turbulent‐like thermal plasma jet for nanopowder production

Shigeta

2018

IEEJ Transactions Elec Engng

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This paper discusses theoretical models and numerical methods to simulate turbulent thermal plasma flow transporting a nanopowder. In addition to a thermal plasma flow model, a sophisticated model is described mathematically for the nanopowder's collective growth by homogeneous nucleation, heterogeneous condensation, and coagulation among nanoparticles, and also transport by convection, diffusion, and thermophoresis, simultaneously. Demonstrative simulations show clearly that a suitable numerical method with high‐order accuracy should be used for long and robust simulation capturing multiscale eddies and steep gradients of temperature, which are the turbulent features of thermal plasma flows with locally variable density, transport properties and Mach numbers. Eddies are first generated at the interfacial region between the plasma jet and ambient nonionized gas by fluid‐dynamic instability. As a result of the eddies' generation–breakup process, the plasma flow entrains the ambient cold gas and deforms its shape traveling downstream. Numerous sub‐nanometer particles are generated by nucleation and condensation in the thin layers near the plasma jet. Those particles diffuse and increase their size, thus decreasing their number by coagulation. Cross‐correlation analysis suggests that the nanopowder distribution distant from a plasma jet can be controlled by controlling the temperature fluctuation at the upstream plasma fringe. © 2018 Institute of Electrical Engineers of Japan. Published by John Wiley & Sons, Inc.

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Section: Thermal Plasma For Nanopowder Productionmentioning

confidence: 99%

Modeling and simulation of a turbulent‐like thermal plasma jet for nanopowder production

Shigeta

2018

IEEJ Transactions Elec Engng

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“…This effect is particularly significant for materials with a high emissivity, such as most metal vapours, and results in a strong local cooling of the plasma near the region where the material is injected in the plasma and evaporated, hence decreasing the precursor evaporation efficiency. Among all the parameters concurring in the process optimization, quench gas injection is perhaps the most thoroughly investigated, due to its strong influence on flow fields, temperature distribution and cooling rates in the system [10][11][12]. In particular, its main effect is to generate a high cooling rate in the tail of the plasma, allowing for the synthesis of nanoparticles with a narrow PSD.…”

Section: Introductionmentioning

confidence: 99%

Design-Oriented Modelling of Different Quenching Solutions in Induction Plasma Synthesis of Copper Nanoparticles

Bianconi

Boselli

Gherardi

et al. 2017

Plasma Chem Plasma Process

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The aim of this paper is to compare the effects of different mechanisms underlying the synthesis of copper nanoparticles using an atmospheric pressure radiofrequency induction thermal plasma. A design oriented modelling approach was used to parametrically investigate trends and impact of different parameters on the synthesis process through a thermo-fluid dynamic model coupled with electromagnetic field equations for describing the plasma behaviour and a moment method for describing nanoparticles nucleation, growth and transport. The effect of radiative losses from Cu vapour on the precursor evaporation efficiency is highlighted, with occurrence of loading effect even with low precursor feed rate due to the decrease in plasma temperature. A method to model nanoparticle deposition on a porous wall is proposed, in which a sticking coefficient is employed to model particle sticking on the porous wall used to carry a quench gas flow into the chamber. Two different reaction chamber designs combined with different quench gas injection strategies (injection through a porous wall for "active" quenching; injection of a shroud gas for "passive" quenching) are analysed in terms of process yield and size distribution of the synthetized nanoparticles. Conclusion can be drawn on the characteristics of each quenching strategy in terms of throughput and mean diameter of the synthesized nanoparticles.

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“…Consequently, radial expansion of RF plasma flame in a reactor may provide these precursors with extended residence time in hot region of plasma flame. In order to estimate these effects, a lot of modeling and experimental works have been conducted for the RF plasma torches coupled with reactors coaxially [42][43][44][45][46]. From these works, it has been confirmed that high temperature region can be expanded radially with the deceleration of RF plasma flows in a reactor having a diameter larger than one of RF plasma torch.…”

Section: Introductionmentioning

confidence: 99%

“…However, the extent of the high temperature region, e.g., isothermal lines corresponding to critical temperatures, such as, 3,000 K for the boiling point of Ni, is not so large compared with the diameters of RF plasma torches. For example, expanded diameters of 3,000 K isothermal lines range from 60~70 mm for the RF plasma torches with a diameter of ~50 mm [42][43][44][45][46]. Accordingly, a cylindrical reactor with a slightly enlarged diameter can be helpful for effective use of RF plasma enthalpy by concentrating the expanded high temperature region.…”

Section: Introductionmentioning

confidence: 99%

Thermal Plasma Synthesis of Nano-Sized Powders

Seo¹,

Hong²

2012

Nuclear Engineering and Technology

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Numerical simulation of silica nanoparticles production in an RF plasma reactor: Effect of quench

Cited by 31 publications

References 7 publications

Modeling and simulation of a turbulent‐like thermal plasma jet for nanopowder production

Modeling and simulation of a turbulent‐like thermal plasma jet for nanopowder production

Design-Oriented Modelling of Different Quenching Solutions in Induction Plasma Synthesis of Copper Nanoparticles

Thermal Plasma Synthesis of Nano-Sized Powders

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