mixing and dispersion of particle ropes in lean phase

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Mixing and dispersion of particle ropes in lean phase ...

2001-9-24  The objective of this study was to investigate mixing mechanisms in lean phase pneumatic conveying, with the emphasis on techniques for dispersing the severe particle stratification caused by flow through a 90° elbow. This type of stratification is referred to as a particle rope.

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Mixing and dispersion of particle ropes in lean phase ...

2017-9-6  Mixing and dispersion of particle ropes in lean phase pneumatic conveying Harun Bilirgen, Edward K. Levy) Energy Research Center, Lehigh UniÕersity, 117 ATLSS DriÕe, Bethlehem, PA 18015, USA Received 21 August 2000; received in revised form 4 November 2000 Abstract

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Lehigh University: Energy Research Center: Current ...

2018-5-1  "Mixing and dispersion of particle ropes in lean phase pneumatic conveying" "CoalCONTROL™ – Emissions Reduction Through Burner Balancing" FOSSIL ENERGY CATEGORIES • Introduction • Coal Drying • On-Line Coal Monitoring • Coal Pipe Balancing • Process Optimization

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Formation and dispersion of ropes in pneumatic conveying ...

In this study, the solid flow nonuniformities which develop in lean phase upward flow in a vertical pneumatic conveying line following a horizontal-to-vertical elbow were investigated. Laboratory experiments were conducted in 154 and 203 mm I.D. test sections using pulverized-coal particles (90% less than 75 μm) for two different 90° circular ...

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Formation and dispersion of ropes in pneumatic conveying ...

2001-1-15  The individual effects of secondary flows and flow turbulence on particle rope dispersion in the vertical pipe was studied using CFX-Flow3D. Two simulations were performed in a vertical pipe assuming a particle rope was present at the inlet. This particle rope was the one created by the short radius elbow (R/D=1.5). The transverse particle ...

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COMPARATIVE ANALYSIS OF THE FLOW IN THE BOILER

Mixing and dispersion of particle ropes in lean phase pneumatic conveying. Article. ... Although all mixing techniques were able to disperse the particle rope within nine pipe diameters from the ...

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Detached eddy simulation of particle dispersion in a gas ...

2005-4-1  Combined with the Lagrangian tracking procedure for the particle phase, the coal particles with various Stokes numbers equal to 0.000434, 0.043, 1.08, 4.34 (corresponding to particle diameter 1, 10, 50, 100 μm, respectively) in the gas–solid fuel rich/lean jet were studied, which shows that although there are coherent vortex structures ...

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Experimental Investigations on Performance of Collision ...

【Abstract】 The concentrating performance of a collision-block-type fuel rich/lean burner was experimentally investigated using a fiber optic measurement system in a two-phase-flow test facility of internal diameter 150 mm.The local solid concentration and particle size distributions were measured to investigate the separation performance of the fuel-rich/lean separator,also the mixing ...

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DEM–CFD simulation of the particle dispersion in a gas ...

2011-4-1  The particle dispersion became more uniform between the fuel-rich side and the fuel-lean side for particles with small Stokes number; while for particles at St > 1, a better fuel-rich/lean separating performance was achieved. The efficiency of the DEM–CFD coupling method was validated by the corresponding experiments, and a good agreement ...

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Wang Bing-清华大学航天航空学院

2021-7-14  Wang B.*, 2010, “Inter-phase interaction in a turbulent, vertical channel flow laden with heavy particles Part I: Numerical methods and particle dispersion properties,” International Journal of Heat and Mass Transfer, Vol. 53(11-12), pp. 2506-2521.

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harun bilirgen Lehigh University - Academia

2014-1-16  Mixing and dispersion of particle ropes in lean phase pneumatic conveying more by harun bilirgen The objective of this study was to investigate mixing mechanisms in lean phase pneumatic conveying, with the emphasis on techniques for dispersing the severe particle stratification caused by flow through a 90° elbow.

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Aspects of computer simulation of liquid-fuelled ...

2012-8-17  Mixing and dispersion of particle ropes in lean phase pneumatic conveying Powder Technology, Vol. 119, No. 2-3 A PDF propagation approach to model turbulent dispersion

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COMPARATIVE ANALYSIS OF THE FLOW IN THE BOILER

Mixing and dispersion of particle ropes in lean phase pneumatic conveying. Article. ... Although all mixing techniques were able to disperse the particle rope within nine pipe diameters from the ...

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DEM–CFD simulation of the particle dispersion in a gas ...

2011-4-1  The particle dispersion became more uniform between the fuel-rich side and the fuel-lean side for particles with small Stokes number; while for particles at St > 1, a better fuel-rich/lean separating performance was achieved. The efficiency of the DEM–CFD coupling method was validated by the corresponding experiments, and a good agreement ...

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Particle Dispersion by Vortex Structures in Plane Mixing ...

1992-12-1  The dispersion of particles in a plane mixing layer between two air streams is investigated using experimental and numerical techniques. The results show that large-scale spanwise vortices strongly influence the particle dispersion process.

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Wang Bing-清华大学航天航空学院

2021-7-14  Wang B.*, 2010, “Inter-phase interaction in a turbulent, vertical channel flow laden with heavy particles Part I: Numerical methods and particle dispersion properties,” International Journal of Heat and Mass Transfer, Vol. 53(11-12), pp. 2506-2521.

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The elements and richness of particle diffusion during ...

lous diffusion may influence particle mixing, particle size segregation and rheological behavior (Utter and Behringer, 2004). In the case of sediment transport, the presence of anomalous versus normal diffusion bears on formulations of transport rates and particle dispersion (Schumer et al.,

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[PDF] Combining Advanced Turbulent Mixing and

Abstract : This work is focused on the development of computational models for the simulation of blast waves, heterogeneous combustion and their interaction with particle dispersion. In particular, a novel Eulerian-Lagrangian (EE/EL) hybrid approach is combines a hybrid Eulerian and Lagrangian framework for dense loading of particles. The Eulerian approach (EE) tracks particles in the dense ...

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Avoid overmixing: How to ensure mix quality and optimal ...

Testing helps. When mixing, the key is to homogenize materials — whether coffee beans or vermiculite — with minimal degradation but with enough energy to evenly distribute pigment, liquid, or other material throughout a given mixture in the minimal amount of time needed to achieve a reaction, color, or phase

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[PDF] PEPT — A novel tool for investigation of pneumatic ...

Abstract Bends are integral parts of a pneumatic conveying system. However, the presence of bends often leads to undesirable phenomena such as roping, particle segregation and attrition, particle deposition and pipe abrasion. It is important to understand the particle motion in the vicinity of bends to better address these issues. In this work a single radioactively labelled particle is ...

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Numerical study on super/hypersonic flow, mixing, and ...

2016-2-18  Three models can well predict the mean velocities of the particle phase. The particle dispersion is over-predicted by the conventional SSF model in the supersonic particle-laden boundary layer flow, while the improved SSF model is less predictable for the particle spatial distribution in the particle-laden strut-injection flow.

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On the dynamics of vortex–droplet interactions, dispersion ...

7 Spatial dispersion of droplets in the swirling gas flow field. In liquid-fuelled combustors, important aspects like the mixing field and the dispersed phase homogenization are governed by the interaction dynamics (Moin Apte Reference Moin and Apte 2006; Wang et al. Reference Wang, Yang, Hsiao, Hsieh and Mongia 2007). In this section, we ...

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Two phase flow dispersion device - McDermott

Referring next to FIG. 7, the present invention is also directed to a dispersion apparatus that provides uniform mixing and dispersion of a two phase flow. In a two phase flow 50 such as pulverized coal and air solids or liquids tend to coagulate and form a rope 62 downstream of bends or elbows that flows along one side of the pipe.

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The elements and richness of particle diffusion during ...

lous diffusion may influence particle mixing, particle size segregation and rheological behavior (Utter and Behringer, 2004). In the case of sediment transport, the presence of anomalous versus normal diffusion bears on formulations of transport rates and particle dispersion (Schumer et al.,

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Numerical Simulation of Turbulent Dispersion of Fuel ...

dispersion of particles in large scale turbulent was carried out using the discrete vortex method. This method is simple to implement and effective in modeling the essence of vortex formation, and fit for coupling with the model of interaction between particles and fluid because both drop-phase and gas-phase are solved in Lagrangian form. The

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Large-Eddy Simulations of Fuel-Air Mixing and Chemical ...

2013-10-15  phase LES flow field. The gas phase velocity field used in the particle equations of motion is obtained using both the filtered LES velocity field and the subgrid kinetic energy. lo, l3 This approach includes the stochastic turbulent dispersion effect into the

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Transitional phenomenon of particle dispersion in gas ...

The dispersion of particles in a plane mixing layer between two air streams is visualized using photographic techniques. The results show that large scale spanwise vortices strongly influence the ...

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Computational Modelling of Particle Degradation in Dilute ...

2003-6-18  The aim of this paper is to develop a mathematical model with the ability to predict particle degradation during dilute phase pneumatic conveying. A numerical procedure, based on a matrix representation of degradation processes, is presented to determine the particle impact degradation propensity from a small number of particle single impact ...

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[PDF] Computational Modelling of Particle Degradation in ...

The aim of this paper is to develop a mathematical model with the ability to predict particle degradation during dilute phase pneumatic conveying. A numerical procedure, based on a matrix representation of degradation processes, is presented to determine the particle impact degradation propensity from a small number of particle single impact tests carried out in a new designed laboratory scale ...

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Active open-loop control of particle dispersion in round ...

2012-5-17  Menu. Home; Journals. AIAA Journal; Journal of Aerospace Information Systems; Journal of Air Transportation; Journal of Aircraft; Journal of Guidance, Control, and Dynamics

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