Plug conveying in a vertical tube

Strauss, M.; McNamara, Sean; Herrmann, Hans J.; Niederreiter, Gerhard; Sommer, Karl

doi:10.1016/j.powtec.2005.10.006

Cited by 25 publications

(19 citation statements)

References 35 publications

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“…3,4 These waves induce potentially destructive pressure transients on the inner-wall of the pipe and provide the mechanism responsible for the intermittent behavior of the flow. Although the dynamics of density waves in granular pipe flows have been studied extensively in the past both experimentally [5][6][7][8][9][10] and through different types of models, 3,4,[11][12][13][14][15][16][17][18][19] it is still a challenging problem to control the mass flux of the granular material flowing through a pipe. For example, Zuriguel et al 20 showed how insertion of an obstacle just above the outlet of a silo can significantly reduce the probability that the granular flow is arrested due to the formation of an arch blocking the silo's outlet.…”

Section: Introductionmentioning

confidence: 99%

Helical inner-wall texture prevents jamming in granular pipe flows

2015

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Granular pipe flows are characterized by intermittent behavior and large, potentially destructive solid fraction variations in the transport direction. By means of particle-based numerical simulations of gravity-driven flows in vertical pipes, we show that it is possible to obtain steady material transport by adding a helical texture to the inner-wall of the pipe. The helical texture leads to a more homogeneous mass flux along the pipe, prevents the emergence of large density waves and substantially reduces the probability of plug formation thus avoiding jamming of the particulate flow. We show that the granular mass flux Q through a pipe of diameter D with a helical texture of wavelength l follows the equation

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Section: Introductionmentioning

confidence: 99%

Helical inner-wall texture prevents jamming in granular pipe flows

2015

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“…In recent years, some efforts have been made in this direction. For example, Strauß et al 52,53 developed a 3-D CFD-DEM for horizontal and vertical slug flow, where gas flow was described by the Darcy law to avoid CFD effort. Chu and Yu 54 integrated a 3-D DEM model into the commercial CFD package Fluent for the study of gas-solid flow through a bend.…”

Section: Introductionmentioning

confidence: 99%

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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“…The flow in the corresponding experiment for the vertical conveying [32] is turbulent (particle Re ≈ 65). In the simulation, an effective gas viscosity is used to account for the effect of turbulence.…”

Section: Simulational Resultsmentioning

confidence: 99%

“…As for the vertical plug conveying [32], an effective viscosity η and an effective friction µ has been introduced. The effective viscosity reflects the increased momentum transport in the gas due to the turbulent flow around the grains.…”

Section: Resultsmentioning

confidence: 99%

“…The behavior of these density waves depends strongly on the orientation of the tube. In vertical plug conveying, most of the particles are located in "plugs" (dense regions) that are pushed up the tube by the pressure gradient [32]. In a horizontal tube the granular medium separates into two layers, the slowly moving bed at the bottom of the pipe and the traveling ripples or the "slugs" [36; 34; 22; 45; 39], where slugs are accumulations of particles which fill up the cross-section of the tube and move quickly in the direction of transportation.…”

Section: Introductionmentioning

confidence: 99%

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Plug conveying in a horizontal tube

2006

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Plug conveying along a horizontal tube has been investigated through simulation, using a discrete element simulation approach for the granulate particles and a pressure field approach for the gas. The result is compared with the simulation of the vertical plug conveying. The dynamics of a slug are described by porosity, velocity and force profiles. Their dependence on simulation parameters provides an overall picture of slug conveying.

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Plug conveying in a vertical tube

Cited by 25 publications

References 35 publications

Helical inner-wall texture prevents jamming in granular pipe flows

Helical inner-wall texture prevents jamming in granular pipe flows

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

Plug conveying in a horizontal tube

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