Dilute-phase pneumatic conveying of polystyrene particles: pressure drop curve and particle distribution over the pipe cross-section

Santos, Sandra; Tambourgi, Elias Basile; Fernandes, Fabiano A. N.; Júnior, Deovaldo de Moraes; Moraes, Marcela Barbosa de

doi:10.1590/s0104-66322011000100010

Cited by 9 publications

(6 citation statements)

References 16 publications

(16 reference statements)

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“…The influence of factors such as the air velocity and particle size on the separation efficiency of the separator was studied at a particle feed rate of 420 g/min (the feed rate of each particle’s relative density of 60 g/min). The mass feed rate of the particles for the −6.7 + 3.36 mm size range using the optimal velocity can be pushed up to 2100 g/min while still maintaining the dilute phase, following a study by Santos et al, who utilized a dilute phase of 6 g of particles in 11 g of air. The mass flowrate can be obtained from eqs and . where ρ air is the density of air at 20 ° C, u is the velocity of air entering into the separator, and A is the cross-sectional area (with a diameter of 100 mm).…”

Section: Resultsmentioning

confidence: 99%

Computer-Aided Design and Fabrication of a Dry Wind-Sifter Separator

2021

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In this study, the simulation of a newly designed wind-sifter separator for dry beneficiation was deployed to upgrade −6.7 + 3.36, −3.36 + 1, and −1 mm coal. The wind-sifter principle is very effective for particle separation as it is based on the separation of lighter particles from heavier ones. First, the study entails computer simulations by utilizing the Lagrangian particle tracking method to observe the effectiveness of the wind sifting principle in separating particles based on their density in an air stream. From the three particle size fractions used, the simulation test results show that at a cut-point of 1.5 RD, yields of 29.1, 54.3, and 99.4% were attained at different optimum velocities for −6.7 + 3.36, −3.36 + 1, and −1 mm, respectively. The effect of operating parameters such as the mass flowrate and air velocity on yield, ash content, and calorific value were determined using the fabricated separator. A preliminary experimental study showed that the separator was effective in upgrading the feed coal with 30.28% ash content and 21 MJ/kg calorific value to clean coal with 18.94% ash content and 26.8 MJ/kg calorific value. A laboratory-scale wind-sifter separator was fabricated based on the results from the simulation test, which served as the first applied prototype in the field of dry coal beneficiation.

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Section: Resultsmentioning

confidence: 99%

Computer-Aided Design and Fabrication of a Dry Wind-Sifter Separator

2021

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“…The final stage is the steady dense phase where the particles move in a gentle and quiet pattern. Operating at higher loading ratio generates a substantial increasing in pressure drop as a result of the additional resistance which is offered by the high concentrated particles [22]. The additional pressure drop leads to raising the base speed required to transport to particles.…”

Section: Introductionmentioning

confidence: 99%

“…Air pressure drop variation with the air velocity and the mass loading[22]. starts to increase again as a result of the particles settling in the vicinity of the lower surface of the pipe.…”

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“…Contours of particle number rate at sections x = 300 mm (left), x = 250 mm (middle) and x = 200 mm (right), x is decreasing in the stream wise direction[23].Experimental work was performed to illustrate the air pressure drop along the flow that is generated by the settling effect[22]. Horizontal flow through a pipe with a diameter of 117 mm and length of 2.7 m has been used.The flow is laden by Polystyrene particles of cylindrical shape with 3.2 mm diameter and density of 1.050 kg/m 3 .…”

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“…A similar curve of the pressure drop was observed.Explained as, the collision of the particles creates a difference between the air and the particles axial velocity consequently the particles exhibit a higher drag force. Although the operating conditions extend to low mass loading and high air velocity, considerable particles concentration in the lower half of the pipe[22].…”

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Solid Particles Injection in Gas Turbulent Channel Flow

Kabeel¹,

Elkelawy²,

Bastawissi³

et al. 2016

EPE

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This paper represents a review of the recent researches that investigate the behavior of the gas turbulent flow laden with solid particles. The significant parameters that influence the interactions between the both phases, such as particle size, loading ratio and the gas velocity, have been extensively reviewed. Those parameters are presented in dimensionless numbers in which the applicability of studying its effect in terms of all circumstances of the gas turbulent channel flow at different condition is possible. The represented results show that the turbulence degree is proportional to the particle size. It was found that at the most flow conditions even at low mass ratio, the particle shape, density and size significantly alter the turbulence characteristics. However, the results demonstrate that the particle Reynolds number is a vital sign: the turbulence field becomes weaker if particle Reynolds number is lower than the critical limit and vies verse. The gas velocity has a strong effect on the particles settling along the channel flow and as a result, the pressure drop will be affected.

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