The flow of granular solids through orifices

Fowler, Robert; Glastonbury, J. R.

doi:10.1016/0009-2509(59)80042-7

Cited by 80 publications

(18 citation statements)

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“…H. Abou-Chakra and U. Tüzün [4] explored the influence of particle properties such as particle size distribution, particle surface moisture on the flowability. As to the fine particle (particle diameter d b 500 μm), the discharge rate decreases with the decrease of the particle diameter, while the coarse particle is just the contrary [5]. This is attributed to the interstitial pressure gradient caused by the relative motion of the air and the particle, and the gradient is much greater for finer particles [6,7].…”

Section: Introductionmentioning

confidence: 92%

Discharge characteristics of cohesive fine coal from aerated hopper

et al. 2009

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Section: Introductionmentioning

confidence: 92%

Discharge characteristics of cohesive fine coal from aerated hopper

et al. 2009

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“…The two curves in Fig. 3 are the predictions by Fowler and Glastonbury (1959) [8] 0.236AyJ2gB h p h l jL and by Brown and Richards (1970) [9] [2…”

Section: Resultsmentioning

confidence: 72%

The Discharge of Fine Silica Sands in a Silo

Hsiau¹,

Hsu

Šmı́d

2009

AIP Conference Proceedings

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Numerous industrial processing operations involve the handling and transport of powders, bulk solids and granules. Silos and bins are widely used to store granular solids. Most theoretical and empirical equations for calculation of discharge rate of fine powders are overestimated when particles smaller than about 500 µm. An air stream flows through silo from outlet to the top which may cause the discharge process becoming unstable and erratic. Open-top silos and closed-top silos with different sizes of outlet openings were used for experimentally studying the discharge behaviors using different-sized silica sands. The impact force, average discharge rate, pressure drop were measured and discussed. Darcy's law was used to predict the pressure drop and compared with the experimental results. Bubble phenomena may occur in the very fine-powder silo system.

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“…One explanation is that the flow is affected by the ratios of the particle, orifice and tube diameters, but these effects can be eliminated if one ensures that the orifice diameter is at least 6 times the particle diameter, the tube diameter is at least the 4/3 power of the orifice diameter and the head of powder is always greater than twice the tube diameter (3,10,12,20).…”

Section: Acknowledgementmentioning

confidence: 99%

“…Dc > Do4/a and H > 2 De, and this ensured that the results were independent of the particular apparatus employed (3,10,12,20).…”

Section: C) Flow Studiesmentioning

confidence: 99%

Flow of granular solids through horizontal orifices

Ahmad

Pilpel

1969

Rheol Acta

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of reducing these results to a form where it can be discussed in standard rheological terms.(2) The mucus tested appears to have a principal relaxation time in the order of 100 sac which would make it appear as a rubbery solid to the action of cilia.(3) The relaxation spectra of mucus infer the presenee of intermolecular entanglement couplings with mucous secretions with distance between entanglement points being approximately twice as great for the specimen cervical mucus as for the specimen of bronchial lung mucus. AcknowledgementThis work has been carried out with the support of the U.S.

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The flow of granular solids through orifices

Cited by 80 publications

References 2 publications

Discharge characteristics of cohesive fine coal from aerated hopper

Discharge characteristics of cohesive fine coal from aerated hopper

The Discharge of Fine Silica Sands in a Silo

Flow of granular solids through horizontal orifices

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