A two-fluid model of gas-assisted atomization including flow through the nozzle, phase inversion, and spray dispersion

Pougatch, Konstantin; Salcudean, M.; Chan, Edward; Knapper, Brian

doi:10.1016/j.ijmultiphaseflow.2009.03.001

Cited by 30 publications

(19 citation statements)

References 32 publications

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“…Given the continuous and discrete phase exchange, the drag law requires the simultaneous consideration of drag force in bubbly flows, free surface flows, and droplet flows. Pougatch et al (2009), Schmidtke and Lucas (2009) also found that an inversion of the dispersed and continuous phases must be considered in the drag force model. Therefore this study's improved method applies to both free surface flows and bubbly flows.…”

Section: Numerical Modelmentioning

confidence: 99%

“…Though the Eulerian model is the most complex of the multiphase models, the interphase drag law is applied to the numerical model and this means that the Eulerian model provides more accurate results than the mixture model. Behzadi et al, (2004); Lane et al, (2005);Pougatch et al, (2009);and Schmidtke and Lucas (2009) have established the potential of the Eulerian model for describing the hydrodynamics of air-water two-phase flow with a high air phase fraction. Schmidtke and Lucas (2009) presented an advanced drag law that applied different drag coefficients between a bubbly fiow and a free surface flow in order to simulate bubble entrainment in an impinging jet.…”

Section: Introductionmentioning

confidence: 99%

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Numerical Simulation of Dissolved Oxygen Concentration in Water Flow over Stepped Spillways

Cheng

Chen

2013

Water Environment Research

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This study developed an improved Eulerian model for the simulation of an air-water flow field over stepped spillways. The improved drag model applied different drag coefficients for bubbles and for free surface flows or gas cavities. Void fraction and turbulence correction were used in determining the bubble drag coefficient. The calculated air entrainment and air-water velocity could be adapted using these parameters. With the improved drag model, the Eulerian simulations predicted the location of the inception point, the distributions of air void fraction, velocity distributions, and pressure distributions. The change in the dissolved oxygen (DO) concentration from upstream of the stepped spillways, to downstream, was simulated based on the improved computational fluid dynamics model and the transport equation for DO transferring. The numerical DO concentration coincided with the experimental results. Therefore, the improved CFD model and the numerical methods presented here can provide possible optimization tools for strong air entrainment flows.

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Section: Numerical Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Numerical Simulation of Dissolved Oxygen Concentration in Water Flow over Stepped Spillways

Cheng

Chen

2013

Water Environment Research

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“…Air-assisted liquid atomization is a complex process that has been recently modeled by Pougatch et al (2009). Air-assisted liquid atomization is a complex process that has been recently modeled by Pougatch et al (2009).…”

Section: Figure 2 Numerical Grid Used In the Simulationmentioning

confidence: 99%

Numerical Simulation of an Evaporative Spray in a Gas-Solid Crossflow

Li¹,

Pougatch²,

Salcudean³

et al. 2010

International Journal of Chemical Reactor Engineering

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Evaporative liquid feeds are often introduced into gas-solid systems through horizontal nozzles in many industry applications. The interactions of gas, particles and evaporative spray play key roles in affecting process efficiency and product quality. Good understanding of the fundamental hydrodynamics of this phenomenon is essential to the design improvement and process optimization. In this work, an Eulerian multi-fluid model for evaporative spray in gas-solid flows is proposed and a three-dimensional numerical simulation of a gas-liquid nitrogen jet in a uniform gas-solid crossflow is performed. In this model, the droplet evaporation and interphase heat transfer are modeled with appropriate semi-empirical correlations. Detailed numerical results of the flow field are obtained and the predicted temperature distribution is compared with experimental measurements in the literature. The evaporative spray jet is investigated under different particles loadings and the effect of spray evaporation on the flow behavior is discussed. Finally, parametric studies are conducted to evaluate the effects of droplet size, jet velocity on the jet behavior.

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“…Recently, the more realistic cases of turbulent atomization conditions have been addressed, e.g. by CFD [23][24][25] and integrated models 17,34 have been proposed. This study considers the case of close coupled atomization of Al alloys and builds upon a theoretical two-phase model for melt fragmentation 32 .…”

Section: Introductionmentioning

confidence: 99%

Spray Forming of al Alloys: experiment and theory

Antipas

2012

Mat. Res.

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Close coupled gas atomization has been studied. Pitot tube gas flow measurements support a postulate of transition from an initial sonic to a supersonic and a final sonic state along the convergence region of the jets. Predictions of the d 50 median diameter utilizing a two phase model for primary and secondary break up correlate strongly with experimental results from He-atomized Al alloys by a factor of 0.8216.

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A two-fluid model of gas-assisted atomization including flow through the nozzle, phase inversion, and spray dispersion

Cited by 30 publications

References 32 publications

Numerical Simulation of Dissolved Oxygen Concentration in Water Flow over Stepped Spillways

Numerical Simulation of Dissolved Oxygen Concentration in Water Flow over Stepped Spillways

Numerical Simulation of an Evaporative Spray in a Gas-Solid Crossflow

Spray Forming of al Alloys: experiment and theory

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