Experimental Studies of Dilute Vertical Pneumatic Transport

Mathisen, Anette; Halvorsen, Britt; Melaaen, Morten C.

doi:10.1080/02726350802028900

Cited by 11 publications

(15 citation statements)

References 13 publications

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“…Indeed, the solids loading ratio (solids to gas mass flow rate ratio) decreases at transport air velocities higher than 14 m/s for both glass beads and zirconium oxide ( Figure 6). However, it can be expected that at the same time, the particle velocity increases with increasing transport air velocity [7,8], which could explain why in our study, the solids mass flow rate remains more or less constant at higher transport air velocities ( Figure 5). …”

Section: Solids Mass Flow Ratementioning

confidence: 61%

“…Earlier studies [5,6] on vertical pneumatic conveyor with a fluidized bed solids feeder showed that the solids mass flow rate was dependent on a combination of transport air flow rate, fluidization air flow rate, height of the fluidized bed, and length and diameter of the transport pipe. Recent work mainly focused on measuring particle velocity profiles in pipe crosssection using laser Doppler anemometry [7] and particle image velocimetry [8]. As expected, the particle velocity was shown to increase with increasing superficial air velocity and decreasing particle size and density [8].…”

Section: Introductionmentioning

confidence: 81%

“…A paper bag filter (7) at the air exhaust was used to collect any escaping particles. Glass windows (8) were installed on the feed and the receiving tank for easy inspection. The feed and the receiving tank were connected with a bleed line (9) (ID = 80 mm) to avoid any pressure build-up between the tanks.…”

Section: Experimental Apparatusmentioning

confidence: 99%

“…Recent work mainly focused on measuring particle velocity profiles in pipe crosssection using laser Doppler anemometry [7] and particle image velocimetry [8]. As expected, the particle velocity was shown to increase with increasing superficial air velocity and decreasing particle size and density [8]. Mathiesen and Solberg [7] also investigated the influence of distance z between the nozzle outlet and the transport pipe inlet on the solids mass flow rate and found that for a given transport air flow rate, the solids mass flow rate increased with increasing distance z.…”

Section: Introductionmentioning

confidence: 99%

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Effect of operating conditions and particle properties on performance of vertical air-lift

2011

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The effect of the fluidization air flow rate and the transport air velocity on the solids mass flow rate and the pressure drop along the transport pipe was investigated in a vertical air-lift. The use of two different materials, glass (150 µm) and zirconium oxide (260 µm) particles (Geldart's B class), enabled to estimate the effect of particle properties on the air-lift performance. Different levels of the solids mass flow rate were obtained by varying the fluidization air flow rate while keeping the transport air velocity constant. The solids loading ratio varied between 2 and 16 for both types of particles. The pressure drop was nonlinearly related to the solids mass flow rate at most of the transport air velocities tested. State diagrams presenting the relationship between the transport air velocity, the solids mass flow rate, and the pipeline pressure drop were constructed to characterize the flow pattern and to compare the behavior of the glass and zirconium oxide particles. Owing to the larger size and higher density, the zirconium oxide particles displayed higher pressure drop values than the glass beads and the minimum pressure drop shifted towards higher transport air velocities. The velocity at the transition between dilute and dense phase conveying was approximately in the range of 7 to 10 m/s for glass beads and 10 to 12 m/s for zirconium oxide, at the solids mass flow rates tested. The flow patterns could be also effectively characterized from the analysis of the pressure drop fluctuations at different transport air velocities.

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Section: Solids Mass Flow Ratementioning

confidence: 61%

Section: Introductionmentioning

confidence: 81%

Section: Experimental Apparatusmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Effect of operating conditions and particle properties on performance of vertical air-lift

2011

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“…Lu, Glass, Easson, & Crapper, 2008;Y. Lu, Glass, & Easson, 2009;Mathisen, Halvorsen, & Melaaen, 2008;Tsuji & Morikawa, 1982). Tsuji and Morikawa (1982) observed that air flow turbulence level depended heavily on particle size, that 3.4 mm particles increased the turbulence while 0.2 mm particles reduced it.…”

Section: Previous Experimental Work On Turbulence Modulationmentioning

confidence: 99%

CFD–DEM simulation of turbulence modulation in horizontal pneumatic conveying

Ebrahimi

Crapper

2017

Particuology

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A study is presented to evaluate the capabilities of the standard k-turbulence model and the k-turbulence model with added source terms in predicting the experimentally measured turbulence modulation due to the presence of particles in horizontal pneumatic conveying, in the context of a CFD-DEM Eulerian-Langrangian simulation. Experiments were performed using a 6.5 m long, 0.075 m diameter horizontal pipe in conjunction with a laser Doppler anemometry (LDA) system. Spherical glass beads with two different sizes, 1.5 mm and 2 mm, were used. Simulations were carried out using the commercial Discrete Element Method (DEM) software EDEM, coupled with the Computational Fluid Dynamics (CFD) package FLUENT. Hybrid source terms were added to the conventional k- turbulence model to take into account the influence of the dispersed phase on the carrier phase turbulence intensity. The simulation results showed that the turbulence modulation depends strongly on the model parameter Cɛ3. Both the standard k- turbulence model and the k- turbulence model with the hybrid source terms could predict the gas phase turbulence intensity trend only generally, with in all cases a noticeable discrepancy between simulation and experimental results was observed, particularly for the regions close to the pipe wall. It was also observed that in some cases the addition of the source terms to the k- turbulence model did not improve the simulation results when compared to the simulation results of the standard k- turbulence model, though in the lower part of the pipe where particle loading was greater due to gravitational effects the model with added source terms performed somewhat better.

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Computation of pressure drop for dilute gas–solid suspension across thin and thick orifices

Senapati

Dash

2021

Particuology

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Experimental Studies of Dilute Vertical Pneumatic Transport

Cited by 11 publications

References 13 publications

Effect of operating conditions and particle properties on performance of vertical air-lift

Effect of operating conditions and particle properties on performance of vertical air-lift

CFD–DEM simulation of turbulence modulation in horizontal pneumatic conveying

Computation of pressure drop for dilute gas–solid suspension across thin and thick orifices

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