Dense-phase pneumatic conveying: A review

Konrad, K.

doi:10.1016/0032-5910(86)85001-x

Cited by 111 publications

(34 citation statements)

References 23 publications

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“…Such a behaviour indicates that dilute flow conditions are reached as the air velocity increases, in spite of the increase in the solids mass flux provided by the feeder. For the whole set of experimental conditions using the spouted bed feeder, voidage values lie between a narrow range from 0.965 to 0.998, which is considered typical of the dilute phase transport (Konrad, 1986). The influence of the particle diameter on the voidage is quite evident, especially at low air velocities.…”

Section: Solids Concentrationmentioning

confidence: 92%

Analysis of Regime Transitions and Flow Instabilities in Vertical Conveying of Coarse Particles Using Different Solids Feeding Systems

Costa¹,

Ferreira

Freire

2004

Can J Chem Eng

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The transition between dense and dilute flow in vertical conveying of Geldart D particles were investigated for risers of different diameters using a spouted bed as a solid feeding system. The transition and choking velocities were identified by combining analyses of pressure gradient versus air velocity diagrams, pressure fluctuation signals and voidage values. Experimental data were used to evaluate the effect of particle and riser diameters on the pressure gradient, mean mixture voidage, the regime transition and choking velocities. The transition velocity from dilute to dense phase could be identified, as well as the onset of the choking condition, which appeared as the air velocity was further reduced. Data obtained in the same experimental apparatus facility using a screw conveyor and a gravitational system as solid feeding devices have been used as a reference to be compared to those obtained using the spouted bed feeder.

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Section: Solids Concentrationmentioning

confidence: 92%

Analysis of Regime Transitions and Flow Instabilities in Vertical Conveying of Coarse Particles Using Different Solids Feeding Systems

Costa¹,

Ferreira

Freire

2004

Can J Chem Eng

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“…To some Ž . such as Leung and Wiles, 1976;Konrad, 1986 , these terms denote flow below the Type C choking condition, that is, slug Ž . flow or possibly bubbling or turbulent fluidization , corresponding to average volumetric solids concentrations of 0.35 Ž or more.…”

Section: Terminology and Flow Regimes In Gas Solids Systemsmentioning

confidence: 99%

Situating the high‐density circulating fluidized bed

et al. 1999

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“…Thus the Newton and Euler equations of motion are solved, accounting for translational and rotational motion (Eqs. (1) and (2)) 1) :…”

Section: Numerical Approachmentioning

confidence: 99%

“…Because of its flexibility in terms of installation, low maintenance cost and a high level of automation pneumatic conveying is a convincing technology in particular in the field of chemical, process and civil engineering [1,2]. The occurring transport modes are dependent on the geometry of the pipes, the conveying velocity, the particle diameter and the mass load of the system [3].…”

Section: Introductionmentioning

confidence: 99%

Coupled DEM‐CFD Simulation of Pneumatically Conveyed Granular Media

et al. 2010

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A DEM-CFD coupling for the simulation of gas-solid flows was successfully implemented and simulations were performed for the application to industrial-scale pneumatic conveying. Therefore, all particle collisions and phase interactions were considered and porosity determination was optimized. The aim of this work is to show the applicability of the presented simulation model to the different regimes of pneumatic conveying systems. As a first test case a dense vertical pneumatic conveying system was chosen and an individual plug was investigated in detail. Variations of the conveying air velocity were also considered. As a second test case dilute conveying in a horizontal-to-vertical pipe bend was simulated. The occurrence of roping and the reduction of particle velocity is of high interest for the design of specific pneumatic systems. It is shown that both regimes can be captured reasonably well and the results are rich in details.

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Dense-phase pneumatic conveying: A review

Cited by 111 publications

References 23 publications

Analysis of Regime Transitions and Flow Instabilities in Vertical Conveying of Coarse Particles Using Different Solids Feeding Systems

Analysis of Regime Transitions and Flow Instabilities in Vertical Conveying of Coarse Particles Using Different Solids Feeding Systems

Situating the high‐density circulating fluidized bed

Coupled DEM‐CFD Simulation of Pneumatically Conveyed Granular Media

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