Roping phenomena in pulverized coal conveying lines

Yılmaz, Ali Emre; Levy, Edward K.

doi:10.1016/s0032-5910(97)03314-7

Cited by 35 publications

(22 citation statements)

References 6 publications

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“…These observations are in line with previous investigations, which observed a gradient in the distribution of particle sizes across the duct, with smaller particles concentrating at the inner wall region, whereas larger particles occurred closer to the outer wall. 7,12,13 The particle mass loading of 0.00206 used in the experiments corresponds to a particle volume fraction of 9.72 Â 10 À7 , which means that the suspension is effectively dilute. At a p 10…”

Section: Particle Phasementioning

confidence: 99%

Prediction of turbulent gas‐solid flow in a duct with a 90° bend using an Eulerian‐Lagrangian approach

Njobuenwu

Fairweather

2011

AIChE Journal

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in Wiley Online Library (wileyonlinelibrary.com).A dilute, particle-laden turbulent flow in a square cross-sectioned duct with a 90 bend is modeled using a three-dimensional Eulerian-Lagrangian approach. Predictions are based on a second-moment turbulence closure, with particles simulated using a Lagrangian particle tracking technique, coupled to a particle-wall interaction algorithm and a random Fourier series method used to model particle dispersion. The performance of the model is tested for a gas-solid flow in a horizontal-to-vertical duct, with predictions showing good agreement with experimental data. In particular, the consistent use of anisotropic and fully three-dimensional approaches throughout yields predictions that result in fluctuating particle velocities in acceptable agreement with data.

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Section: Particle Phasementioning

confidence: 99%

Prediction of turbulent gas‐solid flow in a duct with a 90° bend using an Eulerian‐Lagrangian approach

Njobuenwu

Fairweather

2011

AIChE Journal

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“…There are a few studies in which the measurements of instantaneous solid velocities using fiber optic probes have been attempted [6,[11][12][13]. Nicolai and Reh [11] claimed that the high frequency measurements of solids velocity and concentrations were possible with the use of a newly developed processing technique.…”

Section: Introductionmentioning

confidence: 99%

Accuracy analysis of the window overlapping technique for velocity measurements using artificial and real signals

Bilirgen

2010

Powder Technology

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“…Bends 1 and 2 will be the focus of investigations in the later part of the thesis. As the different industries continue to look for ways to improve their conveying systems, either for safety concerns [2] or for increasing throughput, pneumatic conveying has already been under research for many decades. Numerical simulations, or computational fluid dynamics (CFD), have emerged over the years as a reliable method to study the mechanisms of pneumatic conveying.…”

Section: Introductionmentioning

confidence: 99%

Characteristics of two-phase gas-particle flows in circular pipes and bends

Heng¹

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Pneumatic conveying systems are employed across different industries with its routing flexibility being one of the reasons it is favoured over other systems. In pneumatic conveying, material fed into the system at the inlet goes through a series of closed piping in a very clean operation. However, the use of pipe bends for routing can cause a phenomenon called particle roping which may decrease the overall efficiency of the system. Due to inertial forces acting on the conveyed Greek alphabets Volume fraction Θ Collisional dissipation of energy Θ Granular temperature Bulk viscosity / Second viscosity Dynamic viscosity Eddy viscosity Density Turbulent Prandtl number ̿ Stress tensor Subscripts Gas phase Arbitrary phase Solid phase [4] on the pickup velocity of particles and de Moraes et al. [5] on head loss coefficient for pipe fittings, both of which deal with properties fundamental to pneumatic conveying processes. While experimental studies form a significant portion of pneumatic conveying investigations, the number of numerical studies are increasing as well. There are a few numerical approaches to study pneumatic conveying flows that build on top of established methods in calculating single-Constitutive relations are usually derived for certain flow conditions and may not be adequate beyond the range that it was originally derived for [10]. Therefore, this thesis first aims to demonstrate the ability of an Eulerian scheme in predicting the flow characteristics of a granular phase in a pneumatic pipe configuration Particle ropes, a region of the pipe cross-sectional area where there is an increased concentration of particles, are caused by pipe bends [14]. When particles enter a pipe bend, inertial effects will tend to cluster the particles into a region of higher particle concentration. This area is usually located on the outer wall of the pipe bend. Particle ropes are sometimes seen as an unwanted occurrence in operations,

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Roping phenomena in pulverized coal conveying lines

Cited by 35 publications

References 6 publications

Prediction of turbulent gas‐solid flow in a duct with a 90° bend using an Eulerian‐Lagrangian approach

Prediction of turbulent gas‐solid flow in a duct with a 90° bend using an Eulerian‐Lagrangian approach

Accuracy analysis of the window overlapping technique for velocity measurements using artificial and real signals

Characteristics of two-phase gas-particle flows in circular pipes and bends

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