The flow rate of granular materials through an orifice

Mankoc, C.; Janda, Álvaro; Arévalo, Roberto; Pastor, José Martín; Zuriguel, Iker; Garcimartín, Ángel; Maza, Diego

doi:10.1007/s10035-007-0062-2

Cited by 233 publications

(172 citation statements)

References 20 publications

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“…(2) and (3)). This result coincides with experimental results and previous numerical simulations (Mankoc et al, 2007;Garcimartín et al, 2009;Perge, 2010).…”

Section: Velocity Of Particlessupporting

confidence: 93%

Measurement of granular flow in a vertical column using pulse induction (PI)

Meziane

Bettahar

Choudhary

et al. 2013

Biosystems Engineering

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Gravity flow of granular materials in vertical columns can generate pressure and density fluctuations which are difficult to quantify. Examination of prior research led us to propose a new measurement technique based on the principle of pulse induction (PI) for metal detection. An experimental device using 8 mm diameter spherical particles flowing through a polyvinylchloride (PVC) pipe of 75 mm diameter and 1000 mm height was developed to demonstrate the feasibility of PI. Ten PI coils were used to quantify tracer movement through the column with time. Average and instantaneous velocities were determined for five diameters of outlet orifices: 68.0, 62.5, 54.5, 44.0 and 36.5 mm. Flow rate was calculated and modelled. When compared to prior research, PI proved to be a reliable method for flow measurement in opaque ducts. Key words: flow of granular materials, emptying silo, pulse induction, PI, tracer, velocity, mass flow. Nomenclature Symbols

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“…(2) and (3)). This result coincides with experimental results and previous numerical simulations (Mankoc et al, 2007;Garcimartín et al, 2009;Perge, 2010).…”

Section: Velocity Of Particlessupporting

confidence: 93%

Measurement of granular flow in a vertical column using pulse induction (PI)

Meziane

Bettahar

Choudhary

et al. 2013

Biosystems Engineering

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“…We have used soft particle molecular dynamics simulations of disks (diameter d ¼ 1 mm) in two dimensions which have been proved to reproduce experimental results of the flow rate in a silo [26]. The simulated flat bottomed silo was 15d wide and had an outlet size R ¼ 3:5d.…”

Section: Prl 107 278001 (2011) P H Y S I C a L R E V I E W L E T T Ementioning

confidence: 99%

Silo Clogging Reduction by the Presence of an Obstacle

et al. 2011

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We present experimental results on the effect that inserting an obstacle just above the outlet of a silo has on the clogging process. We find that, if the obstacle position is properly selected, the probability that the granular flow is arrested can be reduced by a factor of 100. This dramatic effect occurs without any remarkable modification of the flow rate or the packing fraction above the outlet, which are discarded as the cause of the change in the clogging probability. Hence, inspired by previous results of pedestrian crowd dynamics, we propose that the physical mechanism behind the clogging reduction is a pressure decrease in the region of arch formation.

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“…Through sufficiently large orifices, such grains flow rather continuously. Quantitative predictions for flow rates were proposed (e. g. [5][6][7][8] and references therein). When the outlet diameter is smaller than about 5 particle diameters [9][10][11][12][13], clogs form after some time at the orifice and block further outflow, mostly unwanted.…”

mentioning

confidence: 99%

Silo outflow of soft frictionless spheres

et al. 2017

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Outflow of granular materials from silos is a remarkably complex physical phenomenon that has been extensively studied with simple objects like monodisperse hard disks in two dimensions (2D) and hard spheres in 2D and 3D. For those materials, empirical equations were found that describe the discharge characteristics. Softness adds qualitatively new features to the dynamics and to the character of the flow. We report a study of the outflow of soft, practically frictionless hydrogel spheres from a quasi-2D bin. Prominent features are intermittent clogs, peculiar flow fields in the container and a pronounced dependence of the flow rate and clogging statistics on the container fill height. The latter is a consequence of the ineffectiveness of Janssen's law: the pressure at the bottom of a bin containing hydrogel spheres grows linearly with the fill height.

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The flow rate of granular materials through an orifice

Cited by 233 publications

References 20 publications

Measurement of granular flow in a vertical column using pulse induction (PI)

Measurement of granular flow in a vertical column using pulse induction (PI)

Silo Clogging Reduction by the Presence of an Obstacle

Silo outflow of soft frictionless spheres

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