Vertical pneumatic conveying in dilute and dense-phase flows: experimental study of the influence of particle density and diameter on fluid dynamic behavior

Narimatsu, C.P.; Ferreira, Maria do Carmo

doi:10.1590/s0104-66322001000300002

Cited by 25 publications

(19 citation statements)

References 8 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Since the contribution of particle drag and weight force is more significant in dense phase, the pressure gradient increased significantly in the dense phase. Similar observation was reported by Mastellone and Arena (1999) and Narimatsu and Ferreira (2001). The figure also shows that the minimum pressure drop velocity increases as the particle size increases.…”

Section: Resultssupporting

confidence: 89%

“…On the other hand, Chung et al (2001) found that the pressure drop decreases as the particle size increases. Narimatsu and Ferreira (2001) found that the particle size is more significant at low conveying velocities. Henthorn et al (2005) investigated the effect of Reynolds number, mass loading, and particle shape and size on pressure drop in a vertical gassolids pneumatic conveying line.…”

Section: Introductionmentioning

confidence: 93%

See 1 more Smart Citation

Prediction of Pressure Drop in Vertical Pneumatic Conveyors

El-Behery

El-Haroun

Abuhegazy

2017

JAFM

View full text Add to dashboard Cite

This paper presents a steady state one-dimensional two-fluid model for gas-solid two-phase flow in a vertical riser. The model is solved using conservative variable approach for the gas phase, and fourth order RungeKutta method is used for the solid phase. The model predictions for pressure drop are compared with available experimental data and with Eulerian-Lagrangian predictions, and a good agreement is obtained. The results indicate that the pressure drop increases as the solid mass flow rate, particle size, and particles density increase. In addition, the model predictions for minimum pressure drop velocity are compared with experimental data from literature and the mean percentage error. MPE for minimum pressure drop velocity is -9.89%. It is found that the minimum pressure drop velocity increases as the solid mass flow, particle size and particle density increase, and decreases as the system total pressure increases.

show abstract

Section: Resultssupporting

confidence: 89%

Section: Introductionmentioning

confidence: 93%

Prediction of Pressure Drop in Vertical Pneumatic Conveyors

El-Behery

El-Haroun

Abuhegazy

2017

JAFM

View full text Add to dashboard Cite

show abstract

“…[11][12][13][14] Some semi theoretical correlations have also been formulated to predict the pressure drop in different flow regimes, 14,15 and the boundaries between flow regimes. 11,[16][17][18] These results are useful in solving some practical problems. However, to date, the mechanisms underlying flow regimes identified and their transition are not clearly understood.…”

Section: Introductionmentioning

confidence: 88%

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

Kuang

2011

AIChE Journal

View full text Add to dashboard Cite

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.

show abstract

“…One can assume that for the solids mass flow rates tested, the minimum pressure drop lies approximately in the velocity range of 7 to 10 m/s for glass beads and 10 to 12 m/s for zirconium oxide. The shift of the pressure drop minimum towards higher transport air velocities for the zirconium oxide particles is expected, because the energy required for the transport increases with increasing particle size and density [11,14]. Since both materials differ in particle size and density, it is not possible to clearly set apart the individual effects of both parameters on the pressure gradients.…”

Section: State Diagramsmentioning

confidence: 99%

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

2011

View full text Add to dashboard Cite

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.

show abstract

Vertical pneumatic conveying in dilute and dense-phase flows: experimental study of the influence of particle density and diameter on fluid dynamic behavior

Cited by 25 publications

References 8 publications

Prediction of Pressure Drop in Vertical Pneumatic Conveyors

Prediction of Pressure Drop in Vertical Pneumatic Conveyors

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

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

Contact Info

Product

Resources

About