Formation and dispersion of ropes in pneumatic conveying

Yılmaz, Ali Emre; Levy, Edward K.

doi:10.1016/s0032-5910(00)00319-3

Cited by 104 publications

(101 citation statements)

References 35 publications

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“…The computational flow domain of validation is limited to a horizontal pipe with a length of 10 pipe diameters, the elbow section, and a vertical pipe with a length of 20 pipe diameters. Fully developed turbulent flow was assumed at the inlet to the horizontal section [2]. A Rosin-Rammler distribution function is used to respect the measured diameter distribution with a mean diameter of 80μm and a spread parameter of 2.76 (see figure 5).…”

Section: Verification Simulationsmentioning

confidence: 99%

“…One such problem is that the rope formation. Indeed, the mixture of gas-solid system makes a turn within an elbow; particles form a rope-like structure because of inertial effects [2]. Other problems such as bends erosion and particles fragmentation; these problems may cause breakdown of the plant or limit the use of the pneumatic conveying system [3].…”

Section: Introductionmentioning

confidence: 99%

“…The formation and dispersion of ropes and gas-particles flow behavior through and after pipe bend have been studied numerically and experimentally by Yilmaz and Levy [2]. The results show a denser particle rope as the pipe bend radius to pipe diameter ratio is increased and secondary flows disperse the rope by carrying particles around the pipe circumference while turbulence disperses the rope by localized mixing of particles.…”

Section: Introductionmentioning

confidence: 99%

“…Based in many previous studies [2] [6][7][8][9][10], flow behavior of the conveying process in gas-solid system within pipe bends is much related to characteristic parameters of particles such as size, density and mass loading ratio and geometries configurations.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Numerical Simulation of Gas-Particles Two Phase Flow in Pipe of Complex Geometry: Pneumatic Conveying of Olive Cake Particles Toward a Dust Burner

Bounaouara¹,

Ettouati²,

Ticha³

et al. 2015

IJHT

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Two phase CFD calculations, using Eulerian-Lagrangian model with commercial Fluent 6.3 were employed to predict the gas and particle flow in pipe of complex geometry designed for pneumatic conveying of olive cake particles toward a pulverized burner. The numerical calculations were validated against experimental data from the literature. The effects of gas velocity and particles size distribution on the mixture flow behavior were studied. The present results help to understand the phenomena occurring in gas-solid flow and optimizing the conveying system.

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Section: Verification Simulationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Numerical Simulation of Gas-Particles Two Phase Flow in Pipe of Complex Geometry: Pneumatic Conveying of Olive Cake Particles Toward a Dust Burner

Bounaouara¹,

Ettouati²,

Ticha³

et al. 2015

IJHT

View full text Add to dashboard Cite

show abstract

“…Tsuji and Morikawa [9] and Tsuji et al [10] for instance developed a complete analysis of the gas-particle flow in the developed flow region of horizontal and vertical ducts by means of Laser Doppler Velocimeter (LDV). Some years later the research group at Lehigh University (Yilmaz and Levy [12]; Akilli et al [1]; Bilirgen and Levy [2]) analyzed the gas-particle flow by means of a fiber optic probe in the presence of different geometrical configurations and devices. The studied geometry was constituted of a vertical duct connected to the first by a 90° elbow and a second horizontal duct connected with the vertical one with another 90° elbow.…”

Section: Introductionmentioning

confidence: 99%

Numerical simulation of gas-solid flow in ducts by CFD techniques

Decker¹,

Noriler²,

Meier³

et al. 2009

Computational Methods in Multiphase Flow V

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Numerical models are nowadays used on a large scale for the simulation of two-phase flow processes in the chemical industry, due mainly to their low implementation cost and important results. However, to find the best numerical models in such processes, validation with experimental data is required. In this sense, the main objective of this work is to apply a CFD model under Eulerian-Eulerian framework for the gas-particle flow, with the capability to predict the fluid dynamics of the two-phase flows in vertical and horizontal ducts separated by 90° elbows. A three-dimensional and transient model has been applied for predictions of volume fractions, pressure, velocities and turbulence properties fields. For the momentum transfer between phases a drag model based on the application of "Churchill" asymptotes techniques was used to obtain a continuous function for all flow regimes. Furthermore, the wall effects over the particulate flow have been investigated. The mathematical model was applied in CFD commercial codes for numerical studies and compared with experimental data obtained by the research group at Lehigh University. The model is solved using the finite-volume method with variables located in a generalized co-ordinate system. The main results present the volume fraction and velocities profiles as a function of the time and position. In addition, the mean velocity and particle concentration of the radial profiles were compared with experimental data in different axial positions of the vertical duct. The results showed a good agreement for the mean particle velocity with the increment of the axial position.

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Micromechanic modeling and analysis of the flow regimes in horizontal pneumatic conveying

Kuang

2011

AIChE Journal

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Pneumatic conveying is an important technology for industries to transport bulk materials from one location to another. Different flow regimes have been observed in such transportation processes, but the underlying fundamentals are not clear. This article presents a three-dimensional (3-D) numerical study of horizontal pneumatic conveying by a combined approach of discrete element model for particles and computational fluid dynamics for gas. This particle scale, micromechanic approach is verified by comparing the calculated and measured results in terms of particle flow pattern and gas pressure drop. It is shown that flow regimes usually encountered in horizontal pneumatic conveying, including slug flow, stratified flow, dispersed flow and transition flow between slug flow and stratified flow, and the corresponding phase diagram can be reproduced. The forces governing the behavior of particles, such as the particleparticle, particle-fluid and particle-wall forces, are then analyzed in detail. It is shown that the roles of these forces vary with flow regimes. A general phase diagram in terms of these forces is proposed to describe the flow regimes in horizontal pneumatic conveying.

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Formation and dispersion of ropes in pneumatic conveying

Cited by 104 publications

References 35 publications

Numerical Simulation of Gas-Particles Two Phase Flow in Pipe of Complex Geometry: Pneumatic Conveying of Olive Cake Particles Toward a Dust Burner

Numerical Simulation of Gas-Particles Two Phase Flow in Pipe of Complex Geometry: Pneumatic Conveying of Olive Cake Particles Toward a Dust Burner

Numerical simulation of gas-solid flow in ducts by CFD techniques

Micromechanic modeling and analysis of the flow regimes in horizontal pneumatic conveying

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