RANS modeling of a particulate turbulent round jet

Kartushinsky, Alexander; Michaelides, Efstathios E.; Rudi, Ylo; Nathan, Graham J.

doi:10.1016/j.ces.2010.02.037

Cited by 9 publications

(2 citation statements)

References 28 publications

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“…Unfortunately the compute times for DNS range into the hundreds of thousands of CPU-hours, rendering it unfeasible for the simulation of "real 617 world" flows. While RANS has received some attention, LES has not been widely developed or utilized for nano-scale multiphase flows (Marchisio and Fox 2005;Schwarzer et al 2006;Rigopoulos 2007;Zucca et al 2007;Kartushinsky et al 2010). LES and RANS offer more affordable compute-times but true assessments of their predicability are limited.…”

Section: Introductionmentioning

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: Introductionmentioning

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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“…A recent paper on particle bearing axisymmetric jets by Kartushinsky et al [8] compares numerical simulations of inert, dilute two phase axisymmetric jet flow with experimental results. The paper includes numerical results of particle distributions, but does not compare these particular results with experiment.…”

Section: Introductionmentioning

confidence: 99%

A Study of a Powder Coating Gun Near Field: Particle Flow in an Isothermal Staggered Concentric Air Jet

2014

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An experimental study of inert particle dispersion in an isothermal concentric air jet near field was conducted for cases of standard non-staggered and alternative staggered jet nozzles, each taken from a polymer powder flame deposition gun. The experimental work consisted of analysis of high speed digital images of the inert two phase isothermal jet flow, illuminated by a laser light sheet along and across the jet axis. The analysis of particle spread in the jet, represented by families of particle density distributions, clearly showed that the staggered nozzles resulted in a better-focused flow, with narrower distributions in the near field, and in the elimination of the recirculation zone that disrupted the particle flow in a non-staggered nozzle arrangement. In all cases, histograms of the cross-sectional particle area density were found to be approximately Gaussian. It was also found that there was a wide variation in the size and shape of the ground polymer particles used and these two characteristics caused a wide variation in the radial and axial velocities of the particles. Despite the differences between single-phase numerical simulations and experimental results, reported in Payne et al. [1], the introduction of particles into a numerical model produced satisfactory agreement with the particle velocities found experimentally.

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Particles deposition at horizontal flat plate in turbulent particulate flow

et al. 2013

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The deposition of aluminium oxide 12 and 23 μm particles onto a horizontal flat plate within the laminar boundary layer in the free‐stream moderate turbulent flow was studied. The present numerical model considered the deposition onto the surface to be a probabilistic process determined both by hydrodynamics and the adhesive behaviour of particles and surface. Numerical simulation was realised for the flat‐plate laminar boundary layer. The two‐fluid approach was used for writing the Euler equations for a carrier gas and particulate phase. The effects of gravity and lift forces on the particles velocities and mass concentration, occurring within the boundary layer, and deposition were studied separately for various particle sizes. It was revealed that gravity and lift forces have decisive influence on the behaviour of solid particles taken place within the laminar boundary layer and on their deposition that is expressed via the distributions of the particles transverse velocity and mass concentration. These effects become more pronounced for the larger 23 μm particles. This fact, coupled with the higher probability of entrainment by the surface, results in their larger deposition velocity. The given study is the attempt to combine the hydrodynamic and adhesive aspects of the particles deposition for its more accurate estimate that is suitable for various practical devices.

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RANS modeling of a particulate turbulent round jet

Cited by 9 publications

References 28 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

A Study of a Powder Coating Gun Near Field: Particle Flow in an Isothermal Staggered Concentric Air Jet

Particles deposition at horizontal flat plate in turbulent particulate flow

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